Convert cubic inches to US gallons
1 in³ = 0.004329 gal. Change the amount below, or read the formula and the reference table further down.
1 cubic inch equals
US gallons
1 in³ = 0.004329 gal
The formula
Cubic inches and US gallons both measure volume from the same zero, so a single multiplier does the job.
gal = in³ × 0.0043290043
Going the other way? Convert US gallons to cubic inches.
Cubic inches to US gallons table
Common values, rounded for reading.
| Cubic inches (in³) | US gallons (gal) |
|---|---|
| 1 | 0.004329 |
| 2 | 0.008658 |
| 3 | 0.012987 |
| 4 | 0.017316 |
| 5 | 0.021645 |
| 6 | 0.025974 |
| 7 | 0.030303 |
| 8 | 0.034632 |
| 9 | 0.038961 |
| 10 | 0.04329 |
| 15 | 0.064935 |
| 20 | 0.08658 |
| 25 | 0.108225 |
| 30 | 0.12987 |
| 40 | 0.17316 |
| 50 | 0.21645 |
| 75 | 0.324675 |
| 100 | 0.4329 |
| 250 | 1.0823 |
| 500 | 2.1645 |
| 1,000 | 4.329 |
Questions people ask
- How many US gallons are in a cubic inch?
- One cubic inch equals 0.0043290043 US gallons.
- How do I convert cubic inches to US gallons by hand?
- Multiply the number of cubic inches by 0.0043290043. For a rough check, 0.004 is close enough for most everyday use.
- What is 1 cubic inch in US gallons?
- 1 cubic inch is 0.004329 US gallons.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.