Convert US gallons to cubic inches
1 gal = 231 in³. Change the amount below, or read the formula and the reference table further down.
1 US gallon equals
cubic inches
1 gal = 231 in³
The formula
US gallons and cubic inches both measure volume from the same zero, so a single multiplier does the job.
in³ = gal × 231
Going the other way? Convert cubic inches to US gallons.
US gallons to cubic inches table
Common values, rounded for reading.
| US gallons (gal) | Cubic inches (in³) |
|---|---|
| 1 | 231 |
| 2 | 462 |
| 3 | 693 |
| 4 | 924 |
| 5 | 1,155 |
| 6 | 1,386 |
| 7 | 1,617 |
| 8 | 1,848 |
| 9 | 2,079 |
| 10 | 2,310 |
| 15 | 3,465 |
| 20 | 4,620 |
| 25 | 5,775 |
| 30 | 6,930 |
| 40 | 9,240 |
| 50 | 11,550 |
| 75 | 17,325 |
| 100 | 23,100 |
| 250 | 57,750 |
| 500 | 115,500 |
| 1,000 | 231,000 |
Questions people ask
- How many cubic inches are in a US gallon?
- One US gallon equals 231 cubic inches.
- How do I convert US gallons to cubic inches by hand?
- Multiply the number of US gallons by 231. For a rough check, 231 is close enough for most everyday use.
- What is 1 US gallon in cubic inches?
- 1 US gallon is 231 cubic inches.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.