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Volumetric Flow Rate

cfmtogph (US)

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

Factor1 cfm = 448.8312 gph (US)

Converter

cfm

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

Result
4488.31gph (US)

Rendered to 6 significant figures.

Formula

Formula
gph (US) = cfm × 448.8312

Multiply any value in cubic feet per minute by 448.8312 to obtain the value in US gallons per hour.

Worked example

Convert 10 cfm to gph (US).

  1. 01Start with 10 cfm.
  2. 02Multiply by the conversion factor: 10 × 448.8312 = 4488.31 gph (US).
Result10 cfm = 4488.31 gph (US)

Conversion table

cfmgph (US)
1448.83
2897.66
52244.2
104488.3
208976.6
5022442
10044883
20089766
5002.2442e+5
10004.4883e+5

Reference values rounded to 5 significant figures for display.

FAQ

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

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