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Volumetric Flow Rate

gph (US)tocfm

Convert US gallons per hour (gph (US)) to cubic feet per minute (cfm).

Factor1 gph (US) = 0.002228009 cfm

Converter

gph (US)

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

Result
2.22801cfm

Rendered to 6 significant figures.

Formula

Formula
cfm = gph (US) × 0.002228009

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

Worked example

Convert 1000 gph (US) to cfm.

  1. 01Start with 1000 gph (US).
  2. 02Multiply by the conversion factor: 1000 × 0.002228009 = 2.22801 cfm.
Result1000 gph (US) = 2.22801 cfm

Conversion table

gph (US)cfm
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 gph (US) to cfm?
1 gph (US) equals 0.002228009 cfm. To convert, multiply the value in US gallons per hour by 0.002228009.
How do I convert 1 gph (US) to cfm?
1 gph (US) = 0.00222801 cfm. For any value, multiply by 0.002228009.
How do I convert cfm back to gph (US)?
Divide by the same factor — or equivalently, multiply by 448.8312. So 1 cfm = 448.831 gph (US).
When would I need to convert US gallon per hour to cubic foot per minute?
Flow-rate conversions show up in pump curve interpretation, control valve sizing (Cv vs Kv), and aligning vendor specifications with process simulation outputs. gph (US) to cfm is a frequently needed conversion for flow datasheet preparation.
Is the conversion exact?
Yes. Both gph (US) and cfm are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).

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