Convert gallons to cubic feet

One us gallon equals 0.133681 cubic feet. To convert any number of us gallons to cubic feet, multiply by 0.13368056.

The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.

Volume is the category where the US and imperial systems diverge most damagingly. Gallons, quarts, pints and fluid ounces all exist in two sizes that differ by up to 20%, and nothing in the name warns you which one a figure uses. Recipes, fuel economy figures and container capacities all cross borders regularly, so it is worth checking which system a source is using before converting rather than after.

gallons to cubic feet formula

To go the other way, use us gallon = cubic foot ÷ 0.13368056.

About these units

A US gallon is 231 cubic inches, about 3.785 litres. It is noticeably smaller than the imperial gallon, which is a frequent source of fuel-economy confusion.

A cubic foot is 28.3 litres. It persists in US appliance capacities, shipping volumes and natural gas measurement.

US Gallon is also written gallons, gals and us gal. Cubic Foot is also written cubic feet, cu ft, ft3 and ft^3.

Sources

1. National Bureau of Standards, "Refinement of Values for the Yard and the Pound", Federal Register, 1 July 1959 — the international yard as exactly 0.9144 m and the avoirdupois pound as exactly 0.45359237 kg.
2. NIST Special Publication 811, Guide for the Use of the International System of Units (SI), 2008 edition — conversion factors for units outside the SI.