This converter turns cubic centimeters into US gallons instantly, using the exact factor 1 cubic centimeter = 0.0002641720524 US gallons. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
Identical to a millilitre; the classic unit for engine displacement. Exactly 231 cubic inches — the US liquid gallon used for fuel and milk.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
cubic centimeters- The amount you are converting, measured in cubic centimeters
0.0002641720524- The exact number of US gallons in one cubic centimeter
US gallons- The converted result
How it works, step by step
- Enter the number of cubic centimeters you want to convert.
- The value is multiplied by 0.0002641720524, the exact conversion factor.
- The result is displayed in US gallons, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 cubic centimeters
Multiply 5 by 0.00026417205. That gives 0.001321 US gallons. A quick sanity check: one cubic centimeter is smaller than one US gallon, so the number should get smaller — and it does.
Converting 72 cubic centimeters
72 × 0.00026417205 = 0.01902 US gallons. Working backwards, 0.01902 ÷ 0.00026417205 returns 72 cubic centimeters, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many US gallons are in one cubic centimeter?
Exactly 0.0002641720524. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert cubic centimeters to US gallons?
Us Gallons = cubic centimeters × 0.0002641720524. To reverse it, divide instead: cubic centimeters = US gallons ÷ 0.0002641720524, which is the same as multiplying by 3785.411784.
Is the cubic centimeter bigger than the US gallon?
No. One cubic centimeter is only 0.000264172 of a US gallon, so the US gallon is the larger unit.
Why does my answer differ slightly from other cubic-centimeters to us-gallons converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a cubic centimeter?
Identical to a millilitre; the classic unit for engine displacement.
What is a US gallon?
Exactly 231 cubic inches — the US liquid gallon used for fuel and milk.
Cubic Centimeters to US gallons reference table
| Cubic Centimeters | Us Gallons |
|---|---|
| 0.5 cm³ | 0.000132 gal |
| 1 cm³ | 0.000264 gal |
| 2 cm³ | 0.000528 gal |
| 3 cm³ | 0.000793 gal |
| 5 cm³ | 0.001321 gal |
| 10 cm³ | 0.002642 gal |
| 15 cm³ | 0.003963 gal |
| 20 cm³ | 0.005283 gal |
| 25 cm³ | 0.006604 gal |
| 50 cm³ | 0.013209 gal |
| 75 cm³ | 0.019813 gal |
| 100 cm³ | 0.026417 gal |
| 250 cm³ | 0.066043 gal |
| 500 cm³ | 0.132086 gal |
| 1000 cm³ | 0.264172 gal |
Exact factor: 1 cubic centimeter = 0.0002641720524 US gallons. Values rounded for display.