Translate volume, flow or height into a unit you can use. Choose a measurement, enter a value and see the conversion factor.
Multiply by 325,851.429. Display rounded to nine significant digits.
Signed values are accepted for heights and changes. Changing units does not change the reference datum or turn a height into water volume.
One acre-foot is 43,560 cubic feet. Using the international foot and US liquid gallon, that is about 325,851.429 gallons. Ten acre-feet is about 3,258,514.29 gallons.
One cubic foot per second is about 448.831169 US gallons per minute. This describes a rate; it is not a stored volume.
Result = input × source factor ÷ destination factor. Factors use metres, cubic metres or cubic metres per second as the intermediate unit. Calculations retain the factors’ precision; displayed results are rounded.
One international foot is exactly 0.3048 metres. One US liquid gallon is 0.003785411784 cubic metres. An acre-foot here uses 43,560 international cubic feet.
Multiply cubic feet per second by 448.831169 to get US gallons per minute. Divide GPM by the same factor to reverse the conversion.
| Cubic feet per second | US gallons per minute |
|---|---|
| 0.1 | 44.883 |
| 1 | 448.831 |
| 5 | 2,244.156 |
| 10 | 4,488.312 |
| 100 | 44,883.117 |
1 CFS is approximately 448.831 US gallons per minute. CFS and ft³/s both mean cubic feet per second. This conversion uses the international foot and US liquid gallon.
500 US gallons per minute ÷ 448.831169 = approximately 1.114 cubic feet per second. Choose Flow rate above and swap the units to calculate another value.
One acre-foot contains approximately 325,851.429 US gallons. An acre-foot is a volume: one acre covered to a depth of one foot. It is different from a flow rate such as CFS.
Not from height alone. Reservoir shape and its elevation–storage relationship are needed. Use our guide to elevation and storage before comparing them.
No. It changes the unit only. A gauge-height reading, reservoir elevation and tidal height can use different reference surfaces even when all are expressed in metres.
No. The converter uses US liquid gallons and the international foot. Historical survey-foot measurements need their original unit definition.
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