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Volumetric Flow Rate

gpm (US)tocfs

Convert US gallons per minute (gpm (US)) to cubic feet per second (cfs).

Factor1 gpm (US) = 0.002228009 cfs

Converter

gpm (US)

Accepts numbers or expressions, e.g. 150 + 14.7

Result
0.222801cfs

Rendered to 6 significant figures.

Formula

Formula
cfs = gpm (US) × 0.002228009

Multiply any value in US gallons per minute by 0.002228009 to obtain the value in cubic feet per second.

Worked example

Convert 100 gpm (US) to cfs.

  1. 01Start with 100 gpm (US).
  2. 02Multiply by the conversion factor: 100 × 0.002228009 = 0.222801 cfs.
Result100 gpm (US) = 0.222801 cfs

Conversion table

gpm (US)cfs
10.002228
20.004456
50.01114
100.02228
200.04456
500.1114
1000.2228
2000.4456
5001.114
10002.228

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from gpm (US) to cfs?
1 gpm (US) equals 0.002228009 cfs. To convert, multiply the value in US gallons per minute by 0.002228009.
How do I convert 1 gpm (US) to cfs?
1 gpm (US) = 0.00222801 cfs. For any value, multiply by 0.002228009.
How do I convert cfs back to gpm (US)?
Divide by the same factor — or equivalently, multiply by 448.8312. So 1 cfs = 448.831 gpm (US).
When would I need to convert US gallon per minute to cubic foot per second?
Flow-rate conversions show up in pump curve interpretation, control valve sizing (Cv vs Kv), and aligning vendor specifications with process simulation outputs. gpm (US) to cfs is a frequently needed conversion for flow datasheet preparation.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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