Gallons to Cubic Feet Converter
Unit ConversionConvert gallons to cubic feet. 1 gallon is about 0.133681 cubic feet, with a conversion table, worked examples and the reverse conversion.
Cubic Feet
Equivalent volume in cubic feet
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SponsoredThis converter turns gallons into cubic feet (gallons to ft3). Enter a value and the result updates as you type. The section "How Many Cubic Feet in a Gallon" below gives the factor and where it comes from.
Water heaters, rain barrels, drums and aquariums are sold by the gallon, while the space they take up and the soil, gravel or concrete around them are measured in cubic feet. This page uses the US liquid gallon of 231 cubic inches, so 7.48 gallons fill about one cubic foot.
The result is rounded to 6 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 Cubic Feet in a Gallon
A US gallon is about 0.133681 cubic feet, a little less than one seventh of a cubic foot. The exact value is 231 ÷ 1,728, the gallon's 231 cubic inches divided by the 1,728 cubic inches in a cubic foot, and that fraction never ends as a decimal.
How to Convert Gallons to Cubic Feet
To convert gallons to cubic feet, multiply by 231 and divide by 1,728, which is the same as dividing by about 7.48052. For example, 300 gallons is about 40.104167 cubic feet.
To go from cubic feet back to gallons, multiply by 1,728 and divide by 231, or multiply by about 7.48052. For example, 100 cubic feet is about 748.051948 gallons.
Gallons to Cubic Feet Conversion Table
Common values in gallons converted to cubic feet, rounded to 6 decimal places.
| Gallons | Cubic Feet |
|---|---|
| 1 gal | 0.133681 ft³ |
| 2 gal | 0.267361 ft³ |
| 10 gal | 1.336806 ft³ |
| 20 gal | 2.673611 ft³ |
| 30 gal | 4.010417 ft³ |
| 50 gal | 6.684028 ft³ |
| 100 gal | 13.368056 ft³ |
| 250 gal | 33.420139 ft³ |
| 500 gal | 66.840278 ft³ |
| 1,000 gal | 133.680556 ft³ |
| 5,000 gal | 668.402778 ft³ |
| 10,000 gal | 1,336.805556 ft³ |
Drums, Barrels and Tanks in Cubic Feet
| Container | Gallons | Cubic Feet |
|---|---|---|
| 5 gallon bucket | 5 gal | 0.668403 ft³ |
| 55 gallon drum | 55 gal | 7.3524 ft³ |
| 275 gallon tote | 275 gal | 36.76 ft³ |
These are the nominal volumes; a drum or tote holds a little more to its brim. To size a tank from its sides instead, use the Tank Volume Calculator, and to fill a hole or a slab around it, the Concrete Volume Calculator works in cubic feet and yards.
Frequently Asked Questions
How many cubic feet is 7 gallons?
About 0.935764 cubic feet.
How many cubic feet is 12 gallons?
About 1.6042 cubic feet.
How many cubic feet is 15 gallons?
About 2.0052 cubic feet.
How many cubic feet is 35 gallons?
About 4.6788 cubic feet.
How many cubic feet is 40 gallons?
About 5.3472 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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