Cubic Foot per Minute to Gallon (US) per Second (CFM to gal/s)
Convert CFM to gal/s — Flow Rate converter
One cubic foot per minute equals 0.12467532 gal/s, so to convert cubic feet per minute to gallons (US) per second you multiply the value by 0.12467532. A cubic foot per minute is smaller than a gallon (US) per second — going the other way, 1 gal/s = 8.020833 CFM. For example, 10 CFM = 1.246753 gal/s and 50 CFM = 6.233766 gal/s.
1 CFM = 0.12467532 gal/s
Cubic Foot per Minute to Gallon (US) per Second formula
1 Cubic Foot per Minute = 0.12467532 gal/s
Worked examples
- 25 CFM = 3.116883 gal/s
- 100 CFM = 12.467532 gal/s
Cubic Foot per Minute to Gallon (US) per Second conversion table
| Cubic Foot per Minute (CFM) | Gallon (US) per Second (gal/s) |
|---|---|
| 1 | 0.12467532 |
| 2 | 0.24935065 |
| 3 | 0.37402597 |
| 5 | 0.62337662 |
| 8 | 0.9974026 |
| 10 | 1.246753 |
| 12 | 1.496104 |
| 15 | 1.87013 |
| 20 | 2.493506 |
| 25 | 3.116883 |
| 50 | 6.233766 |
| 100 | 12.467532 |
| 250 | 31.168831 |
| 500 | 62.337662 |
| 1000 | 124.675325 |
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 = 0.12467532 gal/s.
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 second are in one cubic foot per minute?
One cubic foot per minute equals 0.12467532 gallons (US) per second (gal/s).
How many cubic feet per minute are in one gallon (US) per second?
One gallon (US) per second equals 8.020833 cubic feet per minute (CFM).
How do you convert cubic feet per minute to gallons (US) per second?
1 Cubic Foot per Minute = 0.12467532 gal/s. Use the calculator above for any value.
What is 5 CFM in gal/s?
5 CFM = 0.62337662 gal/s.
What is 100 CFM in gal/s?
100 CFM = 12.467532 gal/s.
What is 10 CFM in gal/s?
10 CFM = 1.246753 gal/s.
What is 20 CFM in gal/s?
20 CFM = 2.493506 gal/s.
What is 50 CFM in gal/s?
50 CFM = 6.233766 gal/s.
What is 500 CFM in gal/s?
500 CFM = 62.337662 gal/s.
Is a cubic foot per minute bigger than a gallon (US) per second?
No. A cubic foot per minute is smaller — one cubic foot per minute equals 0.12467532 gallons (US) per second, while one gallon (US) per second equals 8.020833 cubic feet per minute.