Cubic Foot per Minute to Gallon (UK) per Minute (CFM to imp gal/min)
Convert CFM to imp gal/min — Flow Rate converter
One cubic foot per minute equals 6.228834 imp gal/min, so to convert cubic feet per minute to gallons (UK) per minute you multiply the value by 6.228834. A cubic foot per minute is larger than a gallon (UK) per minute — going the other way, 1 imp gal/min = 0.1605437 CFM. For example, 10 CFM = 62.288335 imp gal/min and 50 CFM = 311.441677 imp gal/min.
1 CFM = 6.228834 imp gal/min
Cubic Foot per Minute to Gallon (UK) per Minute formula
1 Cubic Foot per Minute = 6.228834 imp gal/min
Worked examples
- 25 CFM = 155.720839 imp gal/min
- 100 CFM = 622.883354 imp gal/min
Cubic Foot per Minute to Gallon (UK) per Minute conversion table
| Cubic Foot per Minute (CFM) | Gallon (UK) per Minute (imp gal/min) |
|---|---|
| 1 | 6.228834 |
| 2 | 12.457667 |
| 3 | 18.686501 |
| 5 | 31.144168 |
| 8 | 49.830668 |
| 10 | 62.288335 |
| 12 | 74.746002 |
| 15 | 93.432503 |
| 20 | 124.576671 |
| 25 | 155.720839 |
| 50 | 311.441677 |
| 100 | 622.883354 |
| 250 | 1557.21 |
| 500 | 3114.42 |
| 1000 | 6228.83 |
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 = 6.228834 imp gal/min.
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 (UK) per minute are in one cubic foot per minute?
One cubic foot per minute equals 6.228834 gallons (UK) per minute (imp gal/min).
How many cubic feet per minute are in one gallon (UK) per minute?
One gallon (UK) per minute equals 0.1605437 cubic feet per minute (CFM).
How do you convert cubic feet per minute to gallons (UK) per minute?
1 Cubic Foot per Minute = 6.228834 imp gal/min. Use the calculator above for any value.
What is 5 CFM in imp gal/min?
5 CFM = 31.144168 imp gal/min.
What is 100 CFM in imp gal/min?
100 CFM = 622.883354 imp gal/min.
What is 10 CFM in imp gal/min?
10 CFM = 62.288335 imp gal/min.
What is 20 CFM in imp gal/min?
20 CFM = 124.576671 imp gal/min.
What is 50 CFM in imp gal/min?
50 CFM = 311.441677 imp gal/min.
What is 500 CFM in imp gal/min?
500 CFM = 3114.42 imp gal/min.
Is a cubic foot per minute bigger than a gallon (UK) per minute?
Yes. A cubic foot per minute is larger — one cubic foot per minute equals 6.228834 gallons (UK) per minute (imp gal/min).