Cubic Feet to Gallons Converter
Unit ConversionConvert cubic feet to gallons. 1 cubic foot is about 7.480519 gallons, with a conversion table, worked examples and the reverse conversion.
Gallons
Equivalent volume in gallons
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SponsoredThis converter turns cubic feet into gallons (ft3 to gallons). Enter a value and the result updates as you type. The section "How Many Gallons in a Cubic Foot" below gives the factor and where it comes from.
Tanks, ponds, pools and water meters often give a size in cubic feet while pumps, chemicals and water bills work in gallons, so this conversion links the two. It uses the US liquid gallon of 231 cubic inches; a UK imperial gallon is about 20% larger, so the same space holds fewer imperial gallons.
The result is rounded to 4 decimal places, but the factor behind it never is, so long chains of conversions stay accurate. Type a whole number or a decimal; the conversion table below lists common values.
How Many Gallons in a Cubic Foot
A cubic foot holds about 7.480519 US gallons. It comes from two exact definitions: a cubic foot is 1,728 cubic inches and a US gallon is 231 cubic inches, so 1,728 ÷ 231 gives the number of gallons, a value that never ends as a decimal. For a quick estimate, about 7.5 gallons per cubic foot is less than 0.3% high.
In imperial gallons a cubic foot is about 6.2288, because each imperial gallon is 4.54609 liters.
How to Convert Cubic Feet to Gallons
To convert cubic feet to gallons, multiply by 1,728 and divide by 231, which is the same as multiplying by about 7.48052. For example, 40 cubic feet is about 299.2208 gallons.
To go from gallons back to cubic feet, multiply by 231 and divide by 1,728, or divide by about 7.48052. For example, 500 gallons is about 66.8403 cubic feet.
Cubic Feet to Gallons Conversion Table
Common values in cubic feet converted to gallons, rounded to 4 decimal places.
| Cubic Feet | Gallons |
|---|---|
| 0.5 ft³ | 3.7403 gal |
| 1 ft³ | 7.4805 gal |
| 2 ft³ | 14.961 gal |
| 3 ft³ | 22.4416 gal |
| 5 ft³ | 37.4026 gal |
| 7.5 ft³ | 56.1039 gal |
| 10 ft³ | 74.8052 gal |
| 20 ft³ | 149.6104 gal |
| 50 ft³ | 374.026 gal |
| 100 ft³ | 748.0519 gal |
| 500 ft³ | 3,740.2597 gal |
| 1,000 ft³ | 7,480.5195 gal |
Cubic Feet of Water in Gallons
A cubic foot of water is the same, about 7.48 gallons, as a cubic foot of anything else, since this is a volume conversion. Its weight is a separate question: at 20 °C a cubic foot of water weighs about 62.3 pounds, and the Cubic Feet to Pounds Converter gives that weight for water and other liquids.
For a pool or a tank, the Pool Volume Calculator and the Tank Volume Calculator work out the volume from the sides or the diameter first. Water bills that count in hundreds of cubic feet convert with the CCF to Gallons Converter.
Frequently Asked Questions
How many gallons is 1.5 cubic feet?
About 11.2208 gallons.
How many gallons is 0.25 cubic feet?
About 1.8701 gallons.
How many gallons is 6 cubic feet?
About 44.8831 gallons.
How many gallons is 15 cubic feet?
About 112.2078 gallons.
How many gallons are in a cubic yard?
About 201.97 US gallons, since a cubic yard is 27 cubic feet.
What happens if I enter a negative number?
The result shows a dash. A volume is an amount of space, so it is never below zero; a minus sign in front of a value is usually a typing slip.
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