Cubic Feet to US Gallons
Convert cubic feet to us gallons instantly. 1 ft³ = 7.4805194805 gal. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert cubic feet to us gallons
To convert cubic feet to us gallons, multiply by 7.4805194805. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
gal = ft³ × 7.4805194805
Cubic Feet to US Gallons conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Cubic Feet | US Gallons |
|---|---|
| 1 ft³ | 7.480519 gal |
| 2 ft³ | 14.961039 gal |
| 3 ft³ | 22.441558 gal |
| 5 ft³ | 37.402597 gal |
| 10 ft³ | 74.805195 gal |
| 20 ft³ | 149.61039 gal |
| 25 ft³ | 187.012987 gal |
| 50 ft³ | 374.025974 gal |
| 100 ft³ | 748.051948 gal |
| 500 ft³ | 3,740.26 gal |
| 1,000 ft³ | 7,480.52 gal |
What is a cubic feet?
About 28.3 litres. Standard for appliance capacity and gas volumes.
What is a us gallon?
Exactly 231 cubic inches — smaller than the imperial gallon.
The formula
gal = ft³ × 7.4805194805
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Cubic Feet to US Gallons
- Type the number of cubic feet you want to convert.
- Read the result in us gallons straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked us gallons to cubic feet page.
Cubic Feet to US Gallons — frequently asked questions
How many us gallons are in a cubic feet?
One cubic feet equals 7.4805194805 gal. gal = ft³ × 7.4805194805
What is the formula to convert cubic feet to us gallons?
The formula is gal = ft³ × 7.4805194805. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert us gallons back to cubic feet?
Divide instead of multiplying: one us gallon is 0.1336805556 ft³. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this cubic feet to us gallons free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the cubic feet to us gallons.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error