Gallon (US) per Hour to Cubic Foot per Second (gal/h to CFS)
Convert gal/h to CFS — Flow Rate converter
One gallon (US) per hour equals 0.0000371335 CFS, so to convert gallons (US) per hour to cubic feet per second you multiply the value by 0.0000371335. A gallon (US) per hour is smaller than a cubic foot per second — going the other way, 1 CFS = 26929.87 gal/h. For example, 10 gal/h = 0.0003713349 CFS and 50 gal/h = 0.0018566744 CFS.
1 gal/h = 0.0000371335 CFS
Gallon (US) per Hour to Cubic Foot per Second formula
1 Gallon (US) per Hour = 0.0000371335 CFS
Worked examples
- 25 gal/h = 0.0009283372 CFS
- 100 gal/h = 0.0037133488 CFS
Gallon (US) per Hour to Cubic Foot per Second conversion table
| Gallon (US) per Hour (gal/h) | Cubic Foot per Second (CFS) |
|---|---|
| 1 | 0.0000371335 |
| 2 | 0.000074267 |
| 3 | 0.0001114005 |
| 5 | 0.0001856674 |
| 8 | 0.0002970679 |
| 10 | 0.0003713349 |
| 12 | 0.0004456019 |
| 15 | 0.0005570023 |
| 20 | 0.0007426698 |
| 25 | 0.0009283372 |
| 50 | 0.0018566744 |
| 100 | 0.0037133488 |
| 250 | 0.0092833719 |
| 500 | 0.01856674 |
| 1000 | 0.03713349 |
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/h = 0.0000371335 CFS.
Frequently asked questions
How many cubic feet per second are in one gallon (US) per hour?
One gallon (US) per hour equals 0.0000371335 cubic feet per second (CFS).
How many gallons (US) per hour are in one cubic foot per second?
One cubic foot per second equals 26929.87 gallons (US) per hour (gal/h).
How do you convert gallons (US) per hour to cubic feet per second?
1 Gallon (US) per Hour = 0.0000371335 CFS. Use the calculator above for any value.
What is 5 gal/h in CFS?
5 gal/h = 0.0001856674 CFS.
What is 100 gal/h in CFS?
100 gal/h = 0.0037133488 CFS.
What is 10 gal/h in CFS?
10 gal/h = 0.0003713349 CFS.
What is 20 gal/h in CFS?
20 gal/h = 0.0007426698 CFS.
What is 50 gal/h in CFS?
50 gal/h = 0.0018566744 CFS.
What is 500 gal/h in CFS?
500 gal/h = 0.01856674 CFS.
Is a gallon (US) per hour bigger than a cubic foot per second?
No. A gallon (US) per hour is smaller — one gallon (US) per hour equals 0.0000371335 cubic feet per second, while one cubic foot per second equals 26929.87 gallons (US) per hour.