Gallon (UK) per Minute to Cubic Foot per Minute (imp gal/min to CFM)
Convert imp gal/min to CFM — Flow Rate converter
One gallon (UK) per minute equals 0.1605437 CFM, so to convert gallons (UK) per minute to cubic feet per minute you multiply the value by 0.1605437. A gallon (UK) per minute is smaller than a cubic foot per minute — going the other way, 1 CFM = 6.228834 imp gal/min. For example, 10 imp gal/min = 1.605437 CFM and 50 imp gal/min = 8.027185 CFM.
1 imp gal/min = 0.1605437 CFM
Gallon (UK) per Minute to Cubic Foot per Minute formula
1 Gallon (UK) per Minute = 0.1605437 CFM
Worked examples
- 25 imp gal/min = 4.013593 CFM
- 100 imp gal/min = 16.05437 CFM
Gallon (UK) per Minute to Cubic Foot per Minute conversion table
| Gallon (UK) per Minute (imp gal/min) | Cubic Foot per Minute (CFM) |
|---|---|
| 1 | 0.1605437 |
| 2 | 0.32108741 |
| 3 | 0.48163111 |
| 5 | 0.80271851 |
| 8 | 1.28435 |
| 10 | 1.605437 |
| 12 | 1.926524 |
| 15 | 2.408156 |
| 20 | 3.210874 |
| 25 | 4.013593 |
| 50 | 8.027185 |
| 100 | 16.05437 |
| 250 | 40.135926 |
| 500 | 80.271851 |
| 1000 | 160.543703 |
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 imp gal/min = 0.1605437 CFM.
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 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 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 do you convert gallons (UK) per minute to cubic feet per minute?
1 Gallon (UK) per Minute = 0.1605437 CFM. Use the calculator above for any value.
What is 5 imp gal/min in CFM?
5 imp gal/min = 0.80271851 CFM.
What is 100 imp gal/min in CFM?
100 imp gal/min = 16.05437 CFM.
What is 10 imp gal/min in CFM?
10 imp gal/min = 1.605437 CFM.
What is 20 imp gal/min in CFM?
20 imp gal/min = 3.210874 CFM.
What is 50 imp gal/min in CFM?
50 imp gal/min = 8.027185 CFM.
What is 500 imp gal/min in CFM?
500 imp gal/min = 80.271851 CFM.
Is a gallon (UK) per minute bigger than a cubic foot per minute?
No. A gallon (UK) per minute is smaller — one gallon (UK) per minute equals 0.1605437 cubic feet per minute, while one cubic foot per minute equals 6.228834 gallons (UK) per minute.