Free Calculator · Published October 2026
GPM to GPD Converter: The Printed 1,440 Minutes
Put a pump curve's gallons per minute and a daily-use note's gallons per day on the same rate line before anyone treats them as two flows.
Built by SubcontractorHub — the software plumbing contractors use to quote, finance, and run every job.
Book a DemoHow the GPM to GPD Converter Uses 1,440
This GPM to GPD converter follows one line on the Florida DEP operator conversion table, revised February 2014: 1440 min = 1 day. Cubic feet per second stay on the CFS to GPM converter.
A steady rate. Not a stored volume and not cubic feet per second.
All calculations are estimates based on historical information and should be verified by the user.
Important: All calculator results are ballpark estimates
All calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for a professional assessment, a supplier quote, or applicable local code requirements.
What Is the GPM to GPD Converter Using?
1,440 from the minute line
The conversion table prints 1440 min = 1 day, on the same family as 60 sec = 1 min and 60 min = 1 hour. This page uses only the 1,440 day figure. A gallon per minute, held steady, is 1,440 gallons in that day.
The sheet prints the digits as 1440, without a comma. This page shows 1,440 so the thousands separator is readable. The factor is the same integer.
Worked examples
Each row is multiplication or division by 1,440. One gallon per minute is 1,440 gallons per day. Ten gallons per minute are 14,400 gallons per day. The reverse of 1,440 gallons per day is 1 gallon per minute. One hundred gallons per day divided by 1,440 is 0.0694 gallons per minute, which is the four-decimal rounding.
| Case | Gallons per minute | Gallons per day |
|---|---|---|
| 1 gallon per minute | 1 | 1440 |
| 10 gallons per minute | 10 | 14400 |
| 1,440 gallons per day | 1 | 1440 |
| 100 gallons per day | 0.0694 | 100 |
This is not the cubic-foot sentence
USGS prints one cubic foot per second as 449 gallons per minute and as 0.646 million gallons per day. The CFS to GPM converter follows that sentence and does not use 1,440. Using 449 times 1,440 would not reprint 0.646 million. If the number in front of you started as cubic feet per second, stay on that tool.
What to write on the job ticket
The entered value, the direction, both results, and the factor 1,440. Name whether the gallons per minute came from a pump tag and the gallons per day came from a use note. A water treatment dealer who saves that note will not re-argue the day count on the next visit. A chemical dose in pounds per day belongs on the chemical feed rate calculator. Pounds of water in a stored gallon belong on the gallons to pounds of water converter. This conversion does not size a device and does not say the well passed a county rule.
What stays off this rate change
Detention time, on the same Florida sheet, is a tank volume in gallons divided by a flow in gallons per day. This page never asks for that volume, so it cannot report a contact time. A cubic-foot-per-second reading still belongs on the USGS factors, 449 and 0.646, rather than on a minutes-per-day multiplication. Write the source of the rate beside the result so a later reader can tell a pump tag from a household-use note.
Frequently Asked Questions
What does this converter change?
It converts gallons per minute and gallons per day using 1,440. Florida's operator conversion table prints 1440 min = 1 day. The tool multiplies and divides by that printed figure. It does not convert cubic feet per second.
Why not use 0.646 million gallons per day?
The CFS converter follows a USGS sentence: one cubic foot per second is 449 gallons per minute and 0.646 million gallons per day. This page is a steady gallon-per-minute rate times 1,440 minutes. It does not start from a cubic foot per second.
Is 10 gallons per minute a tank size?
No. Ten gallons per minute times 1,440 is 14,400 gallons per day. That is a rate change. It is not a contact-tank volume, a well yield, or a pass line.
Does this page compute detention time?
No. The same Florida sheet prints detention time in days as volume in gallons divided by flow in gallons per day. This converter stops at the 1,440 rate change. It does not ask for a tank volume.
Where do pounds per day belong?
Pounds per day of a chemical dose are the chemical feed rate calculator, which also uses 1,440 when a flow starts in gallons per minute. Pounds of water in a stored gallon are the gallons to pounds of water converter. Neither of those is this rate change.
Save the Day Factor Next to the Rate
Gallons per minute, gallons per day, and the factor 1,440 belong on the customer record.
Get a Free DemoAll calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for a professional assessment, a supplier quote, or applicable local code requirements. It does not convert cubic feet per second.