Cubic Inches to US Gallons
Convert cubic inches to us gallons instantly. 1 in³ = 0.0043290043 gal. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert cubic inches to us gallons
To convert cubic inches to us gallons, divide by 231 (multiply by 0.0043290043). 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 = in³ × 0.0043290043
Cubic Inches to US Gallons conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Cubic Inches | US Gallons |
|---|---|
| 1 in³ | 0.004329 gal |
| 2 in³ | 0.008658 gal |
| 3 in³ | 0.012987 gal |
| 5 in³ | 0.021645 gal |
| 10 in³ | 0.04329 gal |
| 20 in³ | 0.08658 gal |
| 25 in³ | 0.108225 gal |
| 50 in³ | 0.21645 gal |
| 100 in³ | 0.4329 gal |
| 500 in³ | 2.164502 gal |
| 1,000 in³ | 4.329004 gal |
What is a cubic inch?
Exactly 16.387064 mL. The classic US engine-displacement unit.
What is a us gallon?
Exactly 231 cubic inches — smaller than the imperial gallon.
The formula
gal = in³ × 0.0043290043
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 Inches to US Gallons
- Type the number of cubic inches 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 inches page.
Cubic Inches to US Gallons — frequently asked questions
How many us gallons are in a cubic inch?
One cubic inch equals 0.0043290043 gal. gal = in³ × 0.0043290043
What is the formula to convert cubic inches to us gallons?
The formula is gal = in³ × 0.0043290043. 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 inches?
Divide instead of multiplying: one us gallon is 231 in³. 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 inches 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 inches to us gallons.
- cubic inches 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