This converter turns cubic feet into US gallons instantly, using the exact factor 1 cubic foot = 7.480519481 US gallons. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The volume of a one-foot cube — used for shipping, refrigerators and natural gas. Exactly 231 cubic inches — the US liquid gallon used for fuel and milk.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
cubic feet- The amount you are converting, measured in cubic feet
7.480519481- The exact number of US gallons in one cubic foot
US gallons- The converted result
How it works, step by step
- Enter the number of cubic feet you want to convert.
- The value is multiplied by 7.480519481, the exact conversion factor.
- The result is displayed in US gallons, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 cubic feet
Multiply 5 by 7.4805195. That gives 37.4026 US gallons. A quick sanity check: one cubic foot is larger than one US gallon, so the number should get bigger — and it does.
Converting 72 cubic feet
72 × 7.4805195 = 538.5974 US gallons. Working backwards, 538.5974 ÷ 7.4805195 returns 72 cubic feet, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many US gallons are in one cubic foot?
Exactly 7.480519481. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert cubic feet to US gallons?
Us Gallons = cubic feet × 7.480519481. To reverse it, divide instead: cubic feet = US gallons ÷ 7.480519481, which is the same as multiplying by 0.1336805556.
Is the cubic foot bigger than the US gallon?
Yes. One cubic foot equals 7.48052 US gallons, so it is the larger unit.
Why does my answer differ slightly from other cubic-feet to us-gallons converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a cubic foot?
The volume of a one-foot cube — used for shipping, refrigerators and natural gas.
What is a US gallon?
Exactly 231 cubic inches — the US liquid gallon used for fuel and milk.
Cubic Feet to US gallons reference table
| Cubic Feet | Us 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 |
| 10 ft³ | 74.8052 gal |
| 15 ft³ | 112.2078 gal |
| 20 ft³ | 149.6104 gal |
| 25 ft³ | 187.013 gal |
| 50 ft³ | 374.026 gal |
| 75 ft³ | 561.039 gal |
| 100 ft³ | 748.0519 gal |
| 250 ft³ | 1,870.13 gal |
| 500 ft³ | 3,740.26 gal |
| 1000 ft³ | 7,480.52 gal |
Exact factor: 1 cubic foot = 7.480519481 US gallons. Values rounded for display.