Cubic Foot per Second to Gallon (US) per Second (CFS to gal/s)
Convert CFS to gal/s — Flow Rate converter
One cubic foot per second equals 7.480519 gal/s, so to convert cubic feet per second to gallons (US) per second you multiply the value by 7.480519. A cubic foot per second is larger than a gallon (US) per second — going the other way, 1 gal/s = 0.13368056 CFS. For example, 10 CFS = 74.805195 gal/s and 50 CFS = 374.025974 gal/s.
1 CFS = 7.480519 gal/s
Cubic Foot per Second to Gallon (US) per Second formula
1 Cubic Foot per Second = 7.480519 gal/s
Worked examples
- 25 CFS = 187.012987 gal/s
- 100 CFS = 748.051948 gal/s
Cubic Foot per Second to Gallon (US) per Second conversion table
| Cubic Foot per Second (CFS) | Gallon (US) per Second (gal/s) |
|---|---|
| 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 CFS = 7.480519 gal/s.
Frequently asked questions
How many gallons (US) per second are in one cubic foot per second?
One cubic foot per second equals 7.480519 gallons (US) per second (gal/s).
How many cubic feet per second are in one gallon (US) per second?
One gallon (US) per second equals 0.13368056 cubic feet per second (CFS).
How do you convert cubic feet per second to gallons (US) per second?
1 Cubic Foot per Second = 7.480519 gal/s. Use the calculator above for any value.
What is 5 CFS in gal/s?
5 CFS = 37.402597 gal/s.
What is 100 CFS in gal/s?
100 CFS = 748.051948 gal/s.
What is 10 CFS in gal/s?
10 CFS = 74.805195 gal/s.
What is 20 CFS in gal/s?
20 CFS = 149.61039 gal/s.
What is 50 CFS in gal/s?
50 CFS = 374.025974 gal/s.
What is 500 CFS in gal/s?
500 CFS = 3740.26 gal/s.
Is a cubic foot per second bigger than a gallon (US) per second?
Yes. A cubic foot per second is larger — one cubic foot per second equals 7.480519 gallons (US) per second (gal/s).