gpm to cfs | Exact Decimal + Formula

1 US Gallon / Minute = 0.002228 Cubic Foot / Second

One cubic foot / second equals about 449 US gallons / minute (exactly 448.8311972 gpm). Real-world use: well pumps, pool pumps, and irrigation systems in the united states. This page expresses those values in cubic feet / second, which is used for US stream gauging and storm-water engineering. Enter any value above — the result updates instantly, and a 1–1000 reference table follows below.

About US Gallon / Minute and Cubic Foot / Second

US Gallon / Minute (gpm)

US gallons per minute measures flow in imperial units; one GPM is about 3.785 L/min.

Where it's used: Well pumps, pool pumps, and irrigation systems in the United States.

Cubic Foot / Second (cfs)

Cubic feet per second measures large flows in imperial units, about 1,699 L/min.

Where it's used: US stream gauging and storm-water engineering.

Flow Rate Converter

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Precision

Formula

cfs = gpm × 0.002228009

To convert US Gallon / Minute to Cubic Foot / Second, use the formula displayed above.

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US Gallon / Minute to Cubic Foot / Second: Quick Reference Table

US Gallon / Minute	Cubic Foot / Second (Decimal)	Fraction	Real-world equivalent
0.001 gpm	0.000002 cfs	-	fractional unit measurement
0.01 gpm	0.000022 cfs	-	fractional unit measurement
0.1 gpm	0.000223 cfs	-	fractional unit measurement
0.5 gpm	0.001114 cfs	-	fractional unit measurement
1 gpm	0.002228 cfs	-	fractional unit measurement
2 gpm	0.004456 cfs	-	fractional unit measurement
5 gpm	0.01114 cfs	-	fractional unit measurement
10 gpm	0.02228 cfs	-	fractional unit measurement
25 gpm	0.0557 cfs	-	fractional unit measurement
50 gpm	0.1114 cfs	-	fractional unit measurement
100 gpm	0.222801 cfs	-	fractional unit measurement
250 gpm	0.557002 cfs	-	fractional unit measurement
500 gpm	1.114005 cfs	-	standard single unit scale
1000 gpm	2.228009 cfs	-	standard single unit scale

gpm to cfs Formula and Examples

Direct Formula cfs = gpm × 0.002228009

Inverse Formula gpm = cfs × 448.831197

Mental Math Shortcut

Divide the value by roughly 448.8 to quickly estimate the converted result.

Common US Gallon / Minute to Cubic Foot / Second Calculations

5 gpm = 0.01114 cfs
10 gpm = 0.02228 cfs
50 gpm = 0.1114 cfs
100 gpm = 0.222801 cfs
500 gpm = 1.114005 cfs

Precision & Practical Use

For example, 10 gpm = 0.02228 cfs — roughly fractional unit measurement.

Results are computed to up to 9 decimal places. Round to the precision of your measuring instrument — for most flow rate applications, 2–3 significant figures are plenty.

Related Specialist Flow Rate Calculators & Niche Tools

Flow rate calculations measure fluid velocity, expressing volume per unit time. Typically calculated in Gallons per Minute (GPM) or Liters per Minute (LPM), these measurements are fundamental in plumbing, irrigation, and hydraulic system design.

Sizing a water pump or designing a sprinkler system requires translating fluid flow rates across metric and imperial systems. Flow calculators allow plumbers and civil engineers to determine if piping and valve sizes can handle specific GPM or LPM rates under pressure, optimizing fluid transport systems for peak output.

Flow gpm to lpm Convert liquid flow rates.

How to Convert US Gallon / Minute to Cubic Foot / Second

How many cubic foot / seconds are in one us gallon / minute?

One US Gallon / Minute (gpm) equals 0.002228 Cubic Foot / Second (cfs). To convert us gallon / minutes to cubic foot / seconds, multiply the us gallon / minute value by 0.002228.

How do I convert US Gallon / Minute to Cubic Foot / Second?

Multiply your us gallon / minute value by 0.002228 to get the result in Cubic Foot / Second: cfs = gpm × 0.002228. For example, 5 gpm = 0.01114 cfs.

What is the formula for converting gpm to cfs?

The conversion formula is cfs = gpm × 0.002228. Use the calculator above for any value, and see the reference table below for common inputs from 0.001 to 1000.

Is there a quick mental estimate for gpm to cfs?