Cubic Inches to Gallons
Convert cubic inches (in³) to gallons (gal). Type in either box; the other updates as you go.
How to convert cubic inches to gallons
To convert cubic inches to gallons, divide the number of cubic inches by 231.
Example
Convert 5 cubic inches to gallons:
Cubic Inch to gallon conversion chart
| Cubic Inches (in³) | Gallons (gal) |
|---|---|
| 1 in³ | 0.004329004 gal |
| 2 in³ | 0.008658009 gal |
| 3 in³ | 0.01298701 gal |
| 4 in³ | 0.01731602 gal |
| 5 in³ | 0.02164502 gal |
| 6 in³ | 0.02597403 gal |
| 7 in³ | 0.03030303 gal |
| 8 in³ | 0.03463203 gal |
| 9 in³ | 0.03896104 gal |
| 10 in³ | 0.04329004 gal |
| 12 in³ | 0.05194805 gal |
| 15 in³ | 0.06493506 gal |
| 20 in³ | 0.08658009 gal |
| 25 in³ | 0.1082251 gal |
| 30 in³ | 0.1298701 gal |
| 40 in³ | 0.1731602 gal |
| 50 in³ | 0.2164502 gal |
| 60 in³ | 0.2597403 gal |
| 70 in³ | 0.3030303 gal |
| 75 in³ | 0.3246753 gal |
| 80 in³ | 0.3463203 gal |
| 90 in³ | 0.3896104 gal |
| 100 in³ | 0.4329004 gal |
| 150 in³ | 0.6493506 gal |
| 200 in³ | 0.8658009 gal |
| 250 in³ | 1.082251 gal |
| 500 in³ | 2.164502 gal |
| 1,000 in³ | 4.329004 gal |
Going the other way? See the gallons to cubic inches chart.
About the units
Cubic Inch (in³)
A cubic inch is the volume of a cube one inch on each side, about 16.39 milliliters. US engine sizes were long given in cubic inches.
Gallon (gal)
A US gallon is 231 cubic inches, about 3.785 liters. It is the unit for fuel and milk in the US. The imperial gallon is about 20% larger.
Frequently asked questions
How many gallons are in a cubic inch?
There are 0.004329004329 gallons in a cubic inch.
How many cubic inches are in a gallon?
There are 231 cubic inches in a gallon.
How do you convert cubic inches to gallons?
To convert cubic inches to gallons, divide the number of cubic inches by 231.
What is 5 cubic inches in gallons?
5 cubic inches equals 0.021645 gallons.
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