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 78 tools
BTU 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 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 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 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 CalculatorContractor Markup Calculator
Calculate markup vs. margin, set the right sell price from job cost, and compare against industry benchmarks for your trade.
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 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 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 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 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 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.
Open CalculatorReady to Close More Jobs?
SubcontractorHub gives roofing, HVAC, and solar contractors a full sales platform — proposals, financing, pipeline management, and operations in one place.
Book a Free Demo