Free Resources
Free Tools for Contractors
Calculators and estimators for HVAC, roofing, solar, plumbing, electrical, and siding contractors — built for field use, sales conversations, and business planning.
Showing 233 tools
Pea Gravel Calculator
Cubic yards from length, width, and depth. Tons use a unit weight you can change. The box starts at 115 lb/cu ft, the low end of compacted GP gravel on FHWA Table 5-17.
Open CalculatorConcrete Block Calculator
Counts concrete masonry units on a nominal 8 by 16 inch face. Specified size is typically 3/8 inch less. Mortar and grout stay blank until you type a yield.
Open CalculatorFence Picket Calculator
Pickets equal fence length divided by picket width plus gap. Posts and rails use the spacing you enter. No prices.
Open CalculatorHVAC Company Name Generator
Draft HVAC company name patterns from a family name, a place, and a service word. It does not search a trademark, a domain, or a state registry.
Open CalculatorPsi to Bar
One psi is 0.06894757 bar, the NIST psi-to-pascal row divided by the bar-to-pascal row. Does not use 6.894757 kilopascals.
Open CalculatorBtu to kWh
One IT Btu is 1,055.056 joules divided by 3,600,000 joules. Does not use the thermochemical Btu and does not convert Btu per hour.
Open CalculatorSoil Calculator
Cubic yards for a raised bed from length, width, and depth. A 4 by 8 foot bed at 12 inches is 1.185 yards. Does not convert the USDA gram range into tons.
Open CalculatorStair Stringer Calculator
Stringer length from total rise and unit run. The length is the square root of rise squared plus run squared. Nosing is not added.
Open CalculatorStone Calculator
Cubic yards of landscape stone from length, width, and depth. Weight stays blank. Does not use 2.65 grams per cubic centimeter as a pile.
Open CalculatorRafter Calculator
Common-rafter line length and sloped tail. Run is half the span minus half the ridge. A horizontal overhang is multiplied by the slope factor.
Open CalculatorSand Calculator
Cubic yards and short tons from FHWA Table 5-9. Loose, dry, well-graded sand is 99 pounds per cubic foot, or 1.3365 short tons per yard.
Open CalculatorSquare Yards to Square Meters
One square yard is 0.8361274 square meters on the NIST table. Does not use 0.09290304, and does not call the factor exact.
Open CalculatorGPM to Liters per Second
One gallon per minute is 0.06309020 liters per second on the NIST table. Does not use 3.785412, and does not call the factor exact.
Open CalculatorHVAC Interview Questions
A 1 to 5 scorecard for service, install, apprentice, CSR, and comfort-advisor interviews. You type the score. It does not print a wage or a passing score.
Open CalculatorSquare Feet to Square Meters
One square foot is 0.09290304 square meters on the NIST table. Does not square the foot factor 0.3048, and does not call the factor exact.
Open CalculatorGrains to Milligrams
One grain is 64.79891 milligrams on the NIST table. Does not use 17.11806 grains per gallon, and does not call the factor exact.
Open CalculatorHVAC Marketing Plan Template
A blank plan. You type the goals, the area, the offers, the budget, the calendar, and the KPIs. The sheet counts filled lines. It does not print a benchmark.
Open CalculatorCubic Yards to Cubic Meters
One cubic yard is 0.7645549 cubic meters on the NIST table. Does not use the yard length factor 0.9144, and does not call the factor exact.
Open CalculatorPsi to Kilopascals
One psi is 6.894757 kilopascals on the NIST table. Does not use 2.31 feet of head, and does not call the factor exact.
Open CalculatorHVAC Job Description Template
A blank posting. You type the role, the duties, and your own pay range. The sheet counts filled lines. It does not print a wage.
Open CalculatorInches to Centimeters
One inch is 2.54 centimeters on the NIST table. Does not use 0.0254 meters, and does not call the factor exact.
Open CalculatorYards to Meters
One yard is 0.9144 meters on the NIST table. Does not use the foot factor 0.3048, and does not call the factor exact.
Open CalculatorHVAC Service Ticket Template
A blank field record. You type the site, the equipment, the work, and the clocks. The sheet counts filled lines and elapsed minutes. It does not print a price.
Open CalculatorGrains per Gallon to mg/L
One U.S. grain per gallon is 17.11806 mg/L on the NIST table. Does not use 17.1, and does not classify hardness.
Open CalculatorFeet to Meters
One foot is 0.3048 meters on the NIST table. Does not use the cubic-foot factor, and does not call the factor exact.
Open CalculatorHVAC Price Book
Blank service tasks. You type the task code, the hours, the parts, and your own price. The sheet counts priced rows. It does not print a labor rate or a markup.
Open CalculatorOunces to Grams
One avoirdupois ounce is 28.34952 grams on the NIST table. Does not use the pound-to-kilogram factor, and does not call the factor exact.
Open CalculatorGallons to Cubic Meters
One U.S. gallon is 0.003785412 cubic meters on the NIST table. Does not use 3.7854 liters or 0.001, and does not call the factor exact.
Open CalculatorHVAC Contract Template
A blank agreement for one installation or one repair. You type the price. The only math is a count of filled sections. It is not a maintenance plan and not legal advice.
Open CalculatorCubic Feet to Cubic Meters
One cubic foot is 0.02831685 cubic meters on the NIST table. Does not use 7.48 gallons or 0.001 liters, and does not call the factor exact.
Open CalculatorPounds to Kilograms
One avoirdupois pound is 0.4535924 kilograms on the NIST table. Does not use 8.33 pounds per gallon, and does not call the factor exact.
Open CalculatorFluid Ounces to Milliliters
One U.S. fluid ounce is 29.57353 milliliters on the NIST table. Does not use 128 fluid ounces per gallon, and does not call the factor exact.
Open CalculatorLiters to Cubic Meters
One liter is 0.001 cubic meters on the NIST table. One cubic meter is 1,000 liters. Does not use 1,000 kilograms or 3.7854 liters per gallon.
Open CalculatorKilograms per Cubic Meter at 32 F
One cubic meter of water is 1,000 kilograms at 32 F on the USGS facts page. Does not use 62.416 pounds per cubic foot, does not use 993 at 100 F, and does not use 8.33 pounds per gallon.
Open CalculatorKilograms per Cubic Meter at 100 F
One cubic meter of water is 993 kilograms at 100 F on the USGS facts page. Does not use 61.998 pounds per cubic foot, does not use 1,000 at 32 F, and does not use 8.33 pounds per gallon.
Open CalculatorHVAC Scope of Work Template
A blank job sheet. You type inclusions, exclusions, equipment, permits, startup, cleanup, customer responsibilities, and a sign-off. The only math is a count of filled sections. It does not set a price.
Open CalculatorGallons to Pints Converter
One gallon is 8 pints on the USGS line. Does not use 4 quarts, does not use 128 fluid ounces, and does not use 3.7854 liters.
Open CalculatorPounds per Cubic Foot at 212 F
One cubic foot of water weighs 59.843 pounds at 212 F on the USGS line. Does not use 62.416 at 32 F, does not use 61.998 at 100 F, and does not use 8.33.
Open CalculatorHVAC Business Plan Template
A blank plan sheet. You type the services, the service area, the pricing approach, the staffing, and the marketing. The only math is jobs per month times the months you typed. It does not set revenue.
Open CalculatorGallons to Quarts Converter
One gallon is 4 quarts on the USGS line. Does not use 1.0568 quarts per liter and does not convert pints or fluid ounces.
Open CalculatorPounds per Cubic Foot at 100 F
One cubic foot of water weighs 61.998 pounds at 100 F on the USGS line. Does not use 62.416 at 32 F, does not use 59.843, and does not use 8.33.
Open CalculatorHVAC Service Agreement Template
A blank maintenance-plan sheet. You type the parties, the equipment, the visits, and the price. The only math is visits per year times the years you typed. Have an attorney review it.
Open CalculatorCFS to Acre-Feet Converter
One cubic foot per second is 1.98 acre-feet per day on the USGS line. Does not print 449 gallons per minute and does not print 0.646 million gallons per day.
Open CalculatorGallons to Fluid Ounces Converter
One gallon is 128 fluid ounces on the USGS line. Does not convert liters, quarts, or pints.
Open CalculatorHVAC Estimate Template
Blank equipment and labor lines, a valid-through date, and exclusions. You type every rate. The page multiplies quantity by that rate and does not supply equipment prices.
Open CalculatorCFS to MGD Converter
One cubic foot per second is 0.646 million gallons per day on the USGS line. Does not print 449 gallons per minute and does not print 1.98 acre-feet.
Open CalculatorPounds per Cubic Foot at 32 F
One cubic foot of water weighs 62.416 pounds at 32 F on the USGS line. Does not use Florida's 62.4, does not use 61.998, and does not use 8.33.
Open CalculatorMillion Gallons to Cubic Feet Converter
One million gallons is 133,685.64 cubic feet on the USGS line. Does not use 3.069 acre-feet and does not convert a day rate.
Open CalculatorLiters to Quarts Converter
One liter is 1.0568 quarts on the USGS line. Does not multiply by 3.7854 and does not convert a flow.
Open CalculatorLiters per Minute to GPM Converter
Liters per minute divided by 3.7854, the USGS figure for liters in one gallon. Does not multiply by 0.2642 and does not convert a tank volume.
Open CalculatorMillion Gallons to Acre-Feet Converter
One million gallons is 3.069 acre-feet on the USGS line. Does not use 325,828.8 gallons and does not convert a day rate.
Open CalculatorMGD to GPM Converter
Million gallons per day times 1,000,000 divided by 1,440. The minutes-per-day figure is on Florida's operator conversion table. Does not dose a chemical.
Open CalculatorAcre-Feet to Gallons Converter
One acre-foot is 43,560 cubic feet times 7.48 gallons, which is 325,828.8 gallons. Does not use 325,851 and does not convert flow.
Open CalculatorCubic Feet to Pounds of Water
Cubic feet of water times 62.4, the figure on Florida's operator conversion table. Does not use 62.416, 8.34, or 7.48, and does not dose a chemical.
Open CalculatorPercent to mg/L Converter
A solution percent times 10,000, the figure on Florida's operator conversion table. Does not dose chlorine and does not run a feed rate.
Open CalculatorGPM to GPD Converter
Gallons per minute times 1,440, the minutes-per-day figure on Florida's operator conversion table. Does not convert cubic feet per second and does not size a tank.
Open CalculatorGallons to Pounds of Water
Gallons of water times 8.34, the figure on Florida's operator conversion table. Does not use 62.4 pounds per cubic foot and does not dose a chemical.
Open CalculatorCubic Feet to Gallons Converter
Cubic feet times 7.48 to gallons, the figure on Florida's operator conversion table. Does not use 7.48051948 and does not convert flow.
Open CalculatorChemical Feed Rate Calculator
Dose times million gallons per day times 8.34, divided by purity as a decimal. Gallons per minute use 1,440. Not a well-shock dose.
Open CalculatorADA Ramp Slope Calculator
Enter the total rise to get required ramp length at the 1:12 ADA maximum, number of runs, landings, total footprint, and slope in percent and degrees.
Open CalculatorPayment Bond Calculator
Estimate payment bond (and optional performance package) cost from contract value, base bond rate, and state or credit risk adjusters.
Open CalculatorMechanics Lien Calculator
Estimate claimable unpaid amount and map preliminary-notice and filing deadline targets from your state's day counts.
Open CalculatorPlumbing Invoice Template
Free plumbing invoice builder — itemize labor, parts, and tax from common job presets, then print or save as PDF. No signup.
Open CalculatorBTU Calculator
Find how many BTUs you need to heat or cool a room based on square footage, ceiling height, climate, sun exposure, and insulation.
Open CalculatorHVAC CFM Calculator
Calculate required airflow (CFM) for a room by the air-change method and the 400-CFM-per-ton rule to size ducts and equipment correctly.
Open CalculatorStatic Pressure Calculator
Enter supply and return manometer readings to get total external static pressure, percent of the nameplate rating, available static pressure and friction rate for duct design.
Open CalculatorSuperheat Calculator
Field diagnostic for HVAC techs — enter suction pressure and line temp to get actual vs. target superheat and a charge verdict for TXV or fixed-orifice systems.
Open CalculatorSubcooling Calculator
Field diagnostic for HVAC techs — enter high-side pressure and liquid line temp to get condensing temperature, actual vs. target subcooling, and a charge verdict for TXV/EEV systems.
Open CalculatorAttic Ventilation Calculator
Size roof ventilation fast — enter attic square footage for the net free area needed under the 1/300 and 1/150 rules, split into balanced soffit intake and ridge exhaust.
Open CalculatorMini Split Sizing Calculator
Size a ductless mini-split head or system by zone square footage, climate, insulation, and sun exposure — with recommended BTU and single vs. multi-zone guidance.
Open CalculatorHVAC Sizing Calculator
Calculate the right AC unit size (BTU/tonnage) for your home based on square footage and climate zone.
Open CalculatorHVAC Replacement Cost Calculator
Estimate total HVAC system replacement cost by system type, equipment tier, unit size, and region — with low/mid/high project ranges.
Open CalculatorHVAC Energy Cost Calculator
Enter AC capacity, SEER rating, daily hours, and electricity rate to see monthly cooling cost and savings vs. older equipment.
Open CalculatorHVAC SEER Savings Calculator
Enter your current and new SEER ratings, system size, and climate to see annual energy savings, monthly savings, and payback period on an HVAC upgrade.
Open CalculatorHVAC Maintenance Plan Pricing Calculator
Enter your labor rate, parts allowance, and visit frequency to find the right annual and monthly price for your HVAC service agreements.
Open CalculatorHVAC Service Call Cost Calculator
Estimate diagnostic, tune-up, and repair visit costs by service type, time of day, and region — so you know what to expect before calling.
Open CalculatorHVAC Flat Rate Pricing Calculator
Build flat rate prices for HVAC repairs by entering your labor rate, parts cost, and overhead — so every tech quotes consistently.
Open CalculatorHVAC Duct Size Calculator
Enter room square footage or CFM to get the recommended round duct diameter, air velocity, and noise rating for supply, return, and trunk duct runs.
Open CalculatorHeat Pump vs. Gas Furnace Calculator
Compare 10-year total cost of a heat pump vs. gas furnace by home size, climate zone, and energy rates — with IRA tax credit applied.
Open CalculatorHVAC Financing Calculator
See monthly payment options for any HVAC system cost at different APRs and loan terms.
Open CalculatorHVAC Maintenance Checklist
20-point interactive checklist covering filters, outdoor unit, air handler, and controls. Get a condition score and know if you need professional service.
Open CalculatorHVAC Technician Salary Calculator
Estimate HVAC pay by state, experience level, sector, certifications, and overtime — anchored to BLS May 2025 wage data rather than crowdsourced guesses.
Open CalculatorTrade Salary Comparison
Compare electrician, plumber, HVAC, and roofer pay side by side in any state on BLS May 2025 data. Plumbers lead nationally by just $610 — and the ranking flips in 29 states.
Open CalculatorApprentice Wage Progression Calculator
Apprentice pay is a percentage of local journeyman scale that steps every 1,000 hours. See what you earn now, at every step ahead, and across the whole apprenticeship.
Open CalculatorOvertime Pay Calculator
Straight time, 1.5x, and double time from daily hours — with California, Alaska, Nevada, and Colorado daily OT rules and the bonus-into-regular-rate calculation most payroll gets wrong.
Open CalculatorPlumber Salary Calculator
Estimate plumber pay by state, experience, specialty, and licensing — anchored to BLS May 2025 data, with both the state median and state 90th percentile as real anchors.
Open CalculatorRoofer Salary Calculator
Estimate roofing pay by state, experience, and specialty on BLS May 2025 data — plus an honest look at why roofing has the lowest wage ceiling of the four major trades.
Open CalculatorElectrician Salary Calculator
Estimate electrician pay by state, experience level, specialty, and licensing — anchored to BLS May 2025 wage data, with both the state median and state 90th percentile as real anchors.
Open CalculatorManual J Load Calculator
Detailed HVAC sizing calculator — accounts for climate, insulation, windows, ceiling height, infiltration, and occupants for a more accurate load estimate than the BTU/sq ft rule of thumb.
Open CalculatorHVAC Troubleshooting Chart
Pick your symptom (AC not cooling, heating not working, strange noise, high bills) and get a step-by-step diagnosis, DIY check, and when to call a pro.
Open CalculatorRoof Snow Load Calculator
Estimate sloped-roof snow load from ground snow load using the ASCE 7 method — with exposure, thermal, and importance factors and total load on the roof.
Open CalculatorGutter Size Calculator
Determine whether you need 5-inch or 6-inch K-style gutters and how many downspouts, based on roof area, pitch, and regional rainfall intensity.
Open CalculatorMetal Roof Cost Calculator
Price a metal roof by material, pitch, complexity, region, and tear-off — with roofing squares, the premium over asphalt, and cost per year of expected life.
Open CalculatorRoof Replacement Cost Calculator
Enter roof size, material, pitch, and region to get a low/mid/high cost estimate for your roofing project.
Open CalculatorRoofing Squares Calculator
Convert home dimensions to roofing squares, including waste factor for materials ordering.
Open CalculatorRoofing Waste Factor Calculator
Enter measured squares, roof complexity, pitch, and shingle type to calculate the right waste percentage and total bundles to order.
Open CalculatorRoofing Material Cost Calculator
Enter home footprint, shingle type, pitch, underlayment, and accessories for a low/mid/high installed cost estimate.
Open CalculatorRoofing Labor Cost Calculator
Estimate labor cost per square by roof complexity, pitch, tear-off layers, and region — before the first bid arrives.
Open CalculatorRoofing Project Timeline Calculator
Estimate how long a roofing job will take based on squares, crew size, pitch, and project complexity.
Open CalculatorRoof Repair vs. Replacement Calculator
Enter repair cost, roof age, expected repair life, and replacement cost to get a clear data-driven recommendation — repair or replace.
Open CalculatorRoof Insurance Claim Calculator
Estimate your insurance payout for a roof claim — see ACV vs. RCV payout, depreciation amount, and net check after your deductible.
Open CalculatorRoof Pitch Calculator
Convert rise and run into roof pitch ratio, slope angle, and area multiplier for accurate roofing estimates.
Open CalculatorCommercial Roof Cost Calculator
Estimate commercial roofing project cost for TPO, EPDM, PVC, modified bitumen, BUR, and metal by square footage, project type, and region.
Open CalculatorRoofing Financing Calculator
Enter project cost, insurance credit, down payment, loan term, and APR to see monthly payment and total interest.
Open CalculatorRoofing Inspection Checklist
25-point interactive inspection checklist covering shingles, flashing, gutters, attic, and structure. Get a condition score and know if repairs or replacement are needed.
Open CalculatorSolar Inverter Sizing Calculator
Size a solar inverter from your array's DC kW using the DC-to-AC ratio — with nearest common inverter size, resulting ratio, and clipping risk.
Open CalculatorSolar Savings Calculator
Estimate your solar savings and payback period based on your monthly electric bill and location.
Open CalculatorSolar Panel Count Calculator
Calculate how many solar panels you need based on your electricity usage, roof size, and location — with wattage and system size output.
Open CalculatorSolar Net Metering Calculator
Enter system size, monthly usage, electricity rate, and net metering policy to estimate monthly bill reduction and annual savings.
Open CalculatorSolar Payback Period Calculator
Calculate your exact solar payback period using system cost, annual production, electricity rate, and the 30% federal tax credit.
Open CalculatorSolar Tax Credit Calculator
Calculate your federal solar ITC (30% through 2032), add state incentives and utility rebates, and see your net system cost after all incentives.
Open CalculatorSolar Lease vs. Buy Calculator
Compare cash purchase, solar loan, and lease over 25 years — see total cost, net savings, and which option wins for your situation.
Open CalculatorSolar Battery Storage Cost Calculator
Estimate installed cost for home battery backup by coverage goal and system type — with 30% ITC savings calculated automatically.
Open CalculatorSolar Production Calculator
Enter system size, region, and panel efficiency for daily kWh output, annual production, first-year savings, and 25-year lifetime savings.
Open CalculatorSolar Loan Payment Calculator
See your monthly solar loan payment, net cost after electricity savings, and total interest — with the 30% federal tax credit built in.
Open CalculatorContractor Bid Calculator
Build a complete job bid — enter materials, labor hours, overhead %, and profit target to get a full cost breakdown and bid total. Works for HVAC, roofing, and solar.
Open CalculatorContractor Profit Margin Calculator
Enter revenue and costs to see gross margin, net margin, markup, and how your margins compare to industry benchmarks.
Open CalculatorContractor Job Profit Calculator
Enter revenue, materials, direct labor, equipment, subcontractors, and overhead rate to see gross profit, net margin, and revenue per labor hour per job.
Open CalculatorSales Conversion Rate Calculator
See how improving close rate by 5–20 points impacts monthly revenue and gross profit — with the same leads and marketing spend.
Open CalculatorMarketing ROI Calculator
Enter monthly spend, leads, appointment rate, close rate, and avg job value to see gross profit return, cost per lead, and cost per closed job.
Open CalculatorROAS Calculator
Enter ad spend, attributed revenue, and gross margin to see ROAS, profit ROAS, and breakeven ROAS for any advertising channel.
Open CalculatorCustomer Acquisition Cost Calculator
Enter marketing spend by channel and new customers to see CAC, plus optional LTV:CAC ratio and interpretation.
Open CalculatorCustomer Lifetime Value Calculator
Enter first job value, gross margin, repeat purchase behavior, and referral rate to see true LTV across first job, repeat revenue, and referral value.
Open CalculatorBusiness Break-Even Calculator
Enter monthly fixed costs, average job revenue, and variable cost rate to see break-even job count, revenue, and how many jobs to hit a profit target.
Open CalculatorPrice Increase Impact Calculator
Model a price increase and volume impact to see if it improves gross profit, how many jobs you can afford to lose, and breakeven volume.
Open CalculatorRevenue Per Employee Calculator
Enter annual revenue and team size to benchmark against HVAC, roofing, and solar industry standards and spot efficiency gaps.
Open CalculatorEmployee Turnover Cost Calculator
Enter hourly wage, recruiting cost, training weeks, and team size to see per-event turnover cost and annual turnover expense.
Open CalculatorBusiness Loan Calculator
Enter loan amount, APR, and term to see monthly payment, total interest, and total cost for equipment, vehicle, or working capital loans.
Open CalculatorContractor Overhead Rate Calculator
Enter monthly fixed costs to see your overhead rate, overhead per job, and the exact markup multiplier you need to price jobs profitably.
Open CalculatorContractor Labor Burden Calculator
Enter base wage, workers' comp, health insurance, PTO, and retirement contributions to see the true fully loaded cost of a field employee.
Open CalculatorHVAC Invoice Template
Build an itemized HVAC invoice from four common job presets — labor, parts, tax, and discount calculated as you type, then print or save as PDF.
Open CalculatorWork Order Template
Build a complete work order from HVAC, roofing, plumbing, electrical, or maintenance presets — customer, scope, itemized labor and parts, fees and tax calculated as you type, then copy the finished work order.
Open CalculatorContractor Estimate Template
Build a complete estimate from HVAC, roofing, solar, or general presets — materials, labor, markup, overhead, and margin calculated as you type, then copy the finished estimate.
Open CalculatorContractor Markup Calculator
Calculate markup vs. margin, set the right sell price from job cost, and compare against industry benchmarks for your trade.
Open CalculatorService Van Cost Per Mile Calculator
Work out what a service van really costs per mile and per job — fixed costs, fuel, and maintenance — plus how much of your average ticket disappears into driving.
Open CalculatorCallback Cost Calculator
See what callbacks cost per visit and per year, including the billable work those hours could have produced, and how much new revenue it takes to replace the lost profit.
Open CalculatorAccounts Receivable & DSO Calculator
Calculate days sales outstanding, how much cash is trapped in unpaid invoices, what it costs to carry, and what faster collection would free up.
Open CalculatorEquipment Lease vs Buy Calculator
Compare leasing against financing a purchase over the years you'll actually keep it — total cash out, resale value, buyout, and the upfront cash each option needs.
Open CalculatorWorkers' Comp Cost Calculator
Estimate workers' compensation premium from payroll, class code rate, and experience mod — with cost per billable hour and what uninsured subs add at audit.
Open CalculatorSchedule of Values Calculator
Build a line-item schedule of values the way an AIA G703 continuation sheet works, then get the G702 summary — completed and stored, retainage withheld, previous certificates, and the current payment due.
Open CalculatorWIP Schedule Calculator
Enter contract value, cost to date, estimated total cost, and billings for each open job to get percentage complete, earned revenue, and whether each job is overbilled or underbilled.
Open CalculatorSales Commission Calculator
Compare paying commission on revenue, on gross profit, or on tiers — with recoverable draws and payroll burden — plus a discount test showing how much of a price cut the rep actually absorbs.
Open CalculatorRetainage Calculator
Calculate construction retainage withheld per draw, accrued to date, and held at completion — with step-down rates and a check on how much of the job's profit is tied up in retention.
Open CalculatorElectrical Bid Calculator
Turn a device, fixture and conduit takeoff into labor hours using editable labor units, then price it with a burdened rate, material waste, overhead recovery and target profit — including a margin vs markup check.
Open CalculatorChange Order Calculator
Price a construction change order from labor, material, equipment, and subcontractor cost with separate overhead, profit, and sub markup — plus a cumulative percentage-of-contract check.
Open CalculatorContractor Lead-to-Revenue Calculator
Enter your revenue goal, average job size, and close rate to find out exactly how many leads your business needs per month.
Open CalculatorHome Improvement Financing Calculator
See monthly payment options for any project cost at different APRs and loan terms.
Open CalculatorWindow Replacement Cost Calculator
Estimate window replacement cost by style, frame material, glass type, and region — includes labor, disposal, and energy savings payback.
Open CalculatorSediment Filter Sizing Calculator
Micron staging, spin-down mesh, standard vs Big Blue housing by peak flow, cartridge change interval and a pressure-drop check for well or city water.
Open CalculatorDeionized Water System Sizing Calculator
Gallons per DI tank and days between exchanges from TDS, CO2 and silica, with DI only vs RO + DI compared.
Open CalculatorCooling Tower Blowdown & Makeup Water Calculator
Evaporation, blowdown and makeup gpm from flow or chiller tons, and the yearly savings from raising cycles.
Open CalculatorIce Machine Water Filter Change Calculator
Commercial ice machine filter change interval from ice output and cartridge rating vs the 6-month limit.
Open CalculatorCommercial Water Softener Sizing Calculator
Size a commercial or twin tank softener on capacity and peak flow: resin per tank, valve class, salt and regen water.
Open CalculatorCommercial Reverse Osmosis System Sizing Calculator
Pick a commercial RO GPD rating corrected for cold feed water, with feed and drain flow, TDS and storage.
Open CalculatorChlorine Injection System Sizing Calculator
Size a well water chlorinator: chlorine or peroxide dose, contact tank, monthly bleach use and pump output.
Open CalculatorWhole House Carbon Filter Sizing Calculator
Activated or catalytic carbon for chlorine or chloramine: media cubic feet, tank size, contact time and how long the carbon lasts.
Open CalculatorAcid Neutralizer Sizing Calculator
Calcite or Corosex blend by pH, tank size, the backwash flow the well must supply, yearly media use and the hardness the neutralizer adds.
Open CalculatorWell Pump Size Calculator
Peak GPM, total dynamic head, approximate pump HP and pressure tank size, including the backwash flow water treatment equipment needs.
Open CalculatorWell Recovery Rate Calculator
Casing refill rate and specific capacity from drawdown, pumping rate, and how fast the water rose after shutdown. Planning only, not a certified yield.
Open CalculatorIron Filter Sizing Calculator
Size an iron filter from peak flow, iron, manganese, and a planning backwash rate. Flags low pH and a well that cannot lift the bed.
Open CalculatorContact Tank Volume Calculator
Straight-side gallons, nominal detention minutes, and effective minutes from a baffling factor. Optional CT if you enter a residual. Not a chlorine dose.
Open CalculatorPicocurie Becquerel Converter
Picocuries times 0.037 to becquerels, or the reverse, from EPA's curie definitions. Does not convert activity into mass and does not mark a limit.
Open CalculatorCFS to GPM Converter
Cubic feet per second times 449 to gallons per minute, plus the USGS 0.646 million-gallons and 1.98 acre-feet factors. Not a certified well yield.
Open CalculatorFeet of Head to PSI Converter
Pounds per square inch times 2.31 to feet of water, from a USGS airline note. Not total dynamic head and not a pump size.
Open CalculatorGallons to Liters Converter
Gallons times 3.7854 to liters, the USGS volume figure. Does not use 0.2642 as the reverse and does not convert flow.
Open CalculatorNitrite Unit Converter
Nitrite-nitrogen times 3.29 to the nitrite ion, or the reverse. Does not convert nitrate. The public 1 mg/L figure is labeled as a public-system number.
Open CalculatorMicrogram Milligram Converter
Micrograms per liter divided by 1,000, or milligrams per liter times 1,000. USGS scale only. Does not compare the result to a limit.
Open CalculatorNitrate Unit Converter
Nitrate-nitrogen times 4.43 to the nitrate ion, or the reverse. Does not convert nitrite. The public 10 mg/L figure is labeled as a public-system number.
Open CalculatorTDS Constituent Sum
Adds the dissolved ions USGS says typically dominate, and leaves blank lines out. A partial sum, not a measured TDS and not a conductivity conversion.
Open CalculatorSoftener Sodium Calculator
Sodium a sodium-chloride softener adds from hardness, about 8 mg/L per grain, using the NDSU 17 mg/L grain factor. Not a medical recommendation.
Open CalculatorCalcium and Magnesium Hardness Calculator
Hardness as CaCO3 from the calcium and magnesium ions, a USGS hardness band, and grains at 17 mg/L. Not a softener size.
Open CalculatorLangelier Saturation Index Calculator
Langelier saturation index from pH, temperature, calcium hardness, alkalinity, and TDS. A planning index for scale versus dissolving calcium carbonate, not a corrosion rate.
Open CalculatorChlorine Dose Calculator
One-time shock bleach from casing diameter and standing water, using the stock ppm formula. Not the continuous chlorine injection calculator.
Open CalculatorResin Volume Calculator
Softener resin cubic feet from a measured bed or a grain target, plus capacity at a salt dose. Does not price a year of salt.
Open CalculatorBackwash Rate Calculator
Backwash gallons per minute from tank diameter, media, and water temperature, and whether the well flow you enter can sustain it.
Open CalculatorSalt Dose Calculator
Salt pounds per regeneration and grain capacity from resin volume or nameplate size and a pounds-per-cubic-foot dose. Not the annual salt-cost tool.
Open CalculatorPressure Tank Sizing Calculator
Size a well pressure tank from pump GPM and cut-in/cut-out. Returns drawdown, precharge and a nominal tank so the pump does not short-cycle.
Open CalculatorWater Softener Salt Cost Calculator
Annual salt cost from hardness, people, grain capacity, salt dose and the price of a bag. Returns pounds, bags and regenerations per year.
Open CalculatorWell Water Treatment System Selector
Enter your water test results and get the treatment stages you need, in correct plumbing order, with typical installed cost.
Open CalculatorUV Water Purifier Sizing Calculator
Size a UV system on peak flow and UV transmittance, not the box rating, plus the pretreatment a UV install requires.
Open CalculatorWater Hardness Converter
Convert ppm to grains per gallon and back, plus mg/L and French, German and English degrees, with the full water hardness scale.
Open CalculatorWater Softener Regeneration Calculator
Days between regenerations, cycles per month, and salt and water use from hardness, household size, capacity and salt dose.
Open CalculatorPunch List Template
Build a construction punch list by room or trade, flag closeout blockers, and track completion to final payment.
Open CalculatorRemodeling Contract Checklist
Score a home improvement contract against 22 clauses covering scope, allowances, change orders and concealed conditions.
Open CalculatorWater Softener Sizing Calculator
Size a water softener from hardness, iron and household use — grain capacity, resin volume, regeneration interval and monthly salt use.
Open CalculatorReverse Osmosis System Cost Calculator
Installed price for under-sink, tankless and whole-house RO, plus filter and membrane cost, water sent to drain, and a real cost per gallon.
Open CalculatorWhole House Water Filter Cost Calculator
Price point-of-entry filtration by system type, with media life calculated from real throughput, running cost, and the tank size the house needs.
Open CalculatorEPA 608 Practice Test
24 practice questions across Core, Type I, II and III — scored instantly against the real 70% pass mark, with an explanation on every answer.
Open CalculatorWater Softener Repair Cost Calculator
Price a softener repair by the fault that failed, then get a repair-vs-replace verdict based on cost per remaining year rather than sticker price.
Open CalculatorWater Softener Troubleshooting Guide
Pick the symptom, answer one question about the brine tank, and get ranked causes with the check, who fixes it and what it costs.
Open CalculatorWater Softener Cost Calculator
Estimate installed water softener cost by system type, grain capacity and whether the home has an existing loop, plus annual running cost.
Open CalculatorWater Heater Sizing Calculator
Size a tank water heater by first-hour rating or a tankless unit by required GPM and temperature rise, based on household size and fixtures.
Open CalculatorPipe Size Calculator
Recommend a water-supply pipe diameter for a target flow rate while keeping velocity in a safe range, by pipe material and max velocity.
Open CalculatorPipe Volume Calculator
Calculate pipe volume in gallons, cubic feet, and liters from pipe size and length. Includes fill time calculation and Schedule 40 reference table for plumbing contractors.
Open CalculatorGenerator Sizing Calculator
Select the loads a home runs during an outage and get running watts, peak starting surge, and the standby generator kW to quote — with headroom and altitude derate.
Open CalculatorBoiler Sizing Calculator
Size a hydronic boiler from actual heat loss by climate zone and envelope, apply domestic hot water priority, and check whether existing baseboard can deliver it.
Open CalculatorSolar Installer Salary Calculator
What solar PV installers earn by state, experience, specialty and certification — built on BLS wage data and capped at published percentiles, not job-board averages.
Open CalculatorRoof Wind Uplift Calculator
ASCE 7 design uplift pressures for the field, perimeter and corner of a low-slope roof from wind speed, exposure category and mean roof height.
Open CalculatorSump Pump Sizing Calculator
Size a sump pump on delivered gallons per hour at real total dynamic head, with the one-inch pit rise test that beats any square-footage estimate.
Open CalculatorFlow Rate Calculator
Convert between GPM and pipe velocity in either direction, measure real flow with a bucket test, and get Hazen-Williams friction loss per 100 feet by pipe material.
Open CalculatorPlumbing Cost Calculator
Estimate plumber cost for any residential job — leaky faucets, drain clogs, water heaters, pipe repairs, and remodels — adjusted for region and urgency.
Open CalculatorWater Heater Replacement Cost Calculator
Get a low/mid/high installed cost estimate for any water heater type — tank gas, electric, tankless, heat pump — adjusted for region and scheduling urgency.
Open CalculatorSquare Footage Calculator
Calculate total square footage across multiple rooms or shapes (rectangle, circle, triangle) — with square yards, square meters, waste factor, and material cost.
Open CalculatorConcrete Calculator
Calculate concrete for slabs, footings, and columns in cubic yards and bags (40/60/80 lb) — with waste factor and ready-mix cost estimate.
Open CalculatorCubic Yard Calculator
Calculate cubic yards and cubic feet for concrete, gravel, soil, and sand across multiple areas — with tons and material cost.
Open CalculatorDirt Calculator
Calculate how much topsoil or fill dirt a job needs in cubic yards, tons, dump truck loads, and bags — with a settling allowance by soil type.
Open CalculatorFoundation Repair Cost Calculator
Estimate foundation repair cost by method — steel and helical piers, epoxy crack injection, slabjacking, carbon fiber straps, wall anchors — with severity and access adjustments.
Open CalculatorFence Cost Calculator
Estimate installed fence cost per linear foot for wood, vinyl, chain link, aluminum, and wrought iron, with height, terrain, gates, and old fence removal.
Open CalculatorMold Remediation Cost Calculator
Estimate mold removal cost by affected area and location — bathroom, basement, crawl space, attic, or HVAC ductwork — with severity and containment level.
Open CalculatorDeck Cost Calculator
Estimate the cost to build a deck by size, material, and height above grade, with railing and stairs priced separately so per-square-foot quotes are comparable.
Open CalculatorDriveway Cost Calculator
Estimate driveway cost for concrete, asphalt, gravel, stamped concrete, or pavers, adjusted for base condition, slope, and heavy-duty thickness.
Open CalculatorWell Drilling Cost Calculator
Estimate water well cost per foot by geology and depth, including casing, submersible pump, pressure tank, trenching, and what each extra 100 feet costs.
Open CalculatorBasement Finishing Cost Calculator
Estimate basement finishing cost per square foot by finish level and moisture condition, with egress window, bathroom, and waterproofing itemized.
Open CalculatorBillable Hours Calculator
Turn paid hours into billable hours using your utilization rate, then see your true effective hourly rate and the rate needed to hit a revenue target.
Open CalculatorKitchen Remodel Cost Calculator
Estimate kitchen remodel cost with cabinets priced per linear foot and countertops per square foot, plus layout change multipliers and resale recovery.
Open CalculatorSeptic System Cost Calculator
Estimate septic cost by system type, bedroom count, and soil percolation — conventional, chamber, aerobic, or mound — plus perc test, permits, and 30-year ownership cost.
Open CalculatorAsphalt Calculator
Calculate how many tons of asphalt a driveway or parking lot needs by area and compacted depth, with mix-type densities, a waste allowance, and cost.
Open CalculatorPaver Calculator
Calculate how many pavers a patio, walkway, or driveway needs by paver size and joint width, plus base gravel, bedding sand, edge restraint, and polymeric sand.
Open CalculatorSod Calculator
Calculate how much sod a lawn needs in square feet, square yards, pieces, and pallets, with a trim allowance for curves and topsoil volume for site prep.
Open CalculatorGravel Calculator
Calculate how much gravel you need in cubic yards, tons, and cost by area and depth — for pea gravel, crushed stone #57, base gravel, and river rock.
Open CalculatorMulch Calculator
Work out how much mulch you need in cubic yards, bags, and pounds across multiple beds — for hardwood, pine bark, cedar, cellulose, and rubber mulch.
Open CalculatorStair Calculator
Calculate riser count, exact riser height, tread count, total run, stringer length, and stair angle from your floor-to-floor height — with a live IRC code check.
Open CalculatorPaint Calculator
Find how many gallons of paint a job needs. Subtracts doors and windows, adjusts coverage for drywall, texture, wood, and masonry, and estimates cost.
Open CalculatorDrywall Calculator
Get drywall sheet count for any board size plus screws, joint compound, and tape — with openings deducted and a waste factor applied.
Open CalculatorInsulation Calculator
Calculate the thickness, board feet, and material cost needed to hit a target R-value for batts, blown-in, and spray foam — with DOE climate zone guidance.
Open CalculatorBoard Foot Calculator
Calculate total board feet and lumber cost from thickness, width, length, and quantity — with a nominal vs. actual lumber dimension reference.
Open CalculatorConduit Fill Calculator
Check percent conduit fill against NEC Chapter 9 for EMT, IMC, RMC and PVC — with the 53%/31%/40% limit applied automatically and the minimum trade size that fits.
Open CalculatorWire Size Calculator
Recommend copper or aluminum wire gauge (AWG) by both ampacity and voltage drop for a given load, voltage, and circuit length — takes the larger of the two.
Open CalculatorVoltage Drop Calculator
Calculate voltage drop and percent drop for copper or aluminum conductors (single- and three-phase) by wire size, current, and run length — with NEC 3%/5% check.
Open CalculatorElectrical Panel Upgrade Cost Calculator
Estimate cost for 100A to 200A upgrades, panel replacements, and subpanels by project type, region, and utility work scope.
Open CalculatorEV Charger Installation Cost Calculator
Estimate Level 2 EVSE installation cost by charger type, panel capacity, wire run distance, and region — with 30% federal tax credit calculated.
Open CalculatorSiding Replacement Cost Calculator
Estimate installed siding cost for vinyl, fiber cement, engineered wood, brick, and metal siding by wall square footage and region.
Open CalculatorVinyl Siding Cost Calculator
Estimate vinyl siding installed cost per square foot by grade — economy, standard, premium insulated, and designer profiles — with material/labor/tear-off breakdown.
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