Cubic Foot per Minute to Gallon (US) per Minute (CFM to GPM)
Convert CFM to GPM — Flow Rate converter
One cubic foot per minute equals 7.480519 GPM, so to convert cubic feet per minute to gallons (US) per minute you multiply the value by 7.480519. A cubic foot per minute is larger than a gallon (US) per minute — going the other way, 1 GPM = 0.13368056 CFM. For example, 10 CFM = 74.805195 GPM and 50 CFM = 374.025974 GPM.
1 CFM = 7.480519 GPM
Cubic Foot per Minute to Gallon (US) per Minute formula
1 Cubic Foot per Minute = 7.480519 GPM
Worked examples
- 25 CFM = 187.012987 GPM
- 100 CFM = 748.051948 GPM
Cubic Foot per Minute to Gallon (US) per Minute conversion table
| Cubic Foot per Minute (CFM) | Gallon (US) per Minute (GPM) |
|---|---|
| 1 | 7.480519 |
| 2 | 14.961039 |
| 3 | 22.441558 |
| 5 | 37.402597 |
| 8 | 59.844156 |
| 10 | 74.805195 |
| 12 | 89.766234 |
| 15 | 112.207792 |
| 20 | 149.61039 |
| 25 | 187.012987 |
| 50 | 374.025974 |
| 100 | 748.051948 |
| 250 | 1870.13 |
| 500 | 3740.26 |
| 1000 | 7480.52 |
Which gallon, and which trade
The single most expensive mistake in flow conversion is the gallon. A US liquid gallon is 3.785411784 litres; an imperial gallon is 4.54609 litres. US GPM and imperial GPM differ by about 20%, and pump datasheets frequently do not say which one they mean. Check the manufacturer's country of origin before trusting a GPM figure.
Different trades default to different units for the same physical quantity: HVAC and compressed air work in CFM, plumbing and pumps in GPM or LPM, and process and water engineering in m³/h or L/s. A specification that mixes them is usually quoting different equipment, not different flows. On this page, 1 CFM = 7.480519 GPM.
CFM to metric is worth memorising: one cubic foot is exactly 0.028316846592 m³, so 1 CFM = 1.699011 m³/h and 1,000 CFM ≈ 1,699 m³/h. Note that CFM on a compressor may be quoted as free air delivery (FAD) at inlet conditions rather than at working pressure — the two are not interchangeable.
Frequently asked questions
How many gallons (US) per minute are in one cubic foot per minute?
One cubic foot per minute equals 7.480519 gallons (US) per minute (GPM).
How many cubic feet per minute are in one gallon (US) per minute?
One gallon (US) per minute equals 0.13368056 cubic feet per minute (CFM).
How do you convert cubic feet per minute to gallons (US) per minute?
1 Cubic Foot per Minute = 7.480519 GPM. Use the calculator above for any value.
What is 5 CFM in GPM?
5 CFM = 37.402597 GPM.
What is 100 CFM in GPM?
100 CFM = 748.051948 GPM.
What is 10 CFM in GPM?
10 CFM = 74.805195 GPM.
What is 20 CFM in GPM?
20 CFM = 149.61039 GPM.
What is 50 CFM in GPM?
50 CFM = 374.025974 GPM.
What is 500 CFM in GPM?
500 CFM = 3740.26 GPM.
Is a cubic foot per minute bigger than a gallon (US) per minute?
Yes. A cubic foot per minute is larger — one cubic foot per minute equals 7.480519 gallons (US) per minute (GPM).