US Gallons to Cubic Feet
Convert us gallons to cubic feet instantly. 1 gal = 0.1336805556 ft³. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert us gallons to cubic feet
To convert us gallons to cubic feet, divide by 7.4805194805 (multiply by 0.1336805556). 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.
ft³ = gal × 0.1336805556
US Gallons to Cubic Feet conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| US Gallons | Cubic Feet |
|---|---|
| 1 gal | 0.133681 ft³ |
| 2 gal | 0.267361 ft³ |
| 3 gal | 0.401042 ft³ |
| 5 gal | 0.668403 ft³ |
| 10 gal | 1.336806 ft³ |
| 20 gal | 2.673611 ft³ |
| 25 gal | 3.342014 ft³ |
| 50 gal | 6.684028 ft³ |
| 100 gal | 13.368056 ft³ |
| 500 gal | 66.840278 ft³ |
| 1,000 gal | 133.680556 ft³ |
What is a us gallon?
Exactly 231 cubic inches — smaller than the imperial gallon.
What is a cubic feet?
About 28.3 litres. Standard for appliance capacity and gas volumes.
The formula
ft³ = gal × 0.1336805556
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 US Gallons to Cubic Feet
- Type the number of us gallons you want to convert.
- Read the result in cubic feet 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 cubic feet to us gallons page.
US Gallons to Cubic Feet — frequently asked questions
How many cubic feet are in a us gallon?
One us gallon equals 0.1336805556 ft³. ft³ = gal × 0.1336805556
What is the formula to convert us gallons to cubic feet?
The formula is ft³ = gal × 0.1336805556. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert cubic feet back to us gallons?
Divide instead of multiplying: one cubic feet is 7.4805194805 gal. 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 us gallons to cubic feet 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 us gallons to cubic feet.
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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