Gallon (US) per Second to Cubic Foot per Second (gal/s to CFS)
Convert gal/s to CFS — Flow Rate converter
One gallon (US) per second equals 0.13368056 CFS, so to convert gallons (US) per second to cubic feet per second you multiply the value by 0.13368056. A gallon (US) per second is smaller than a cubic foot per second — going the other way, 1 CFS = 7.480519 gal/s. For example, 10 gal/s = 1.336806 CFS and 50 gal/s = 6.684028 CFS.
1 gal/s = 0.13368056 CFS
Gallon (US) per Second to Cubic Foot per Second formula
1 Gallon (US) per Second = 0.13368056 CFS
Worked examples
- 25 gal/s = 3.342014 CFS
- 100 gal/s = 13.368056 CFS
Gallon (US) per Second to Cubic Foot per Second conversion table
| Gallon (US) per Second (gal/s) | Cubic Foot per Second (CFS) |
|---|---|
| 1 | 0.13368056 |
| 2 | 0.26736111 |
| 3 | 0.40104167 |
| 5 | 0.66840278 |
| 8 | 1.069444 |
| 10 | 1.336806 |
| 12 | 1.604167 |
| 15 | 2.005208 |
| 20 | 2.673611 |
| 25 | 3.342014 |
| 50 | 6.684028 |
| 100 | 13.368056 |
| 250 | 33.420139 |
| 500 | 66.840278 |
| 1000 | 133.680556 |
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 gal/s = 0.13368056 CFS.
Frequently asked questions
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 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 do you convert gallons (US) per second to cubic feet per second?
1 Gallon (US) per Second = 0.13368056 CFS. Use the calculator above for any value.
What is 5 gal/s in CFS?
5 gal/s = 0.66840278 CFS.
What is 100 gal/s in CFS?
100 gal/s = 13.368056 CFS.
What is 10 gal/s in CFS?
10 gal/s = 1.336806 CFS.
What is 20 gal/s in CFS?
20 gal/s = 2.673611 CFS.
What is 50 gal/s in CFS?
50 gal/s = 6.684028 CFS.
What is 500 gal/s in CFS?
500 gal/s = 66.840278 CFS.
Is a gallon (US) per second bigger than a cubic foot per second?
No. A gallon (US) per second is smaller — one gallon (US) per second equals 0.13368056 cubic feet per second, while one cubic foot per second equals 7.480519 gallons (US) per second.