US Gallons to Cubic Meters
Convert us gallons to cubic meters instantly. 1 gal = 0.0037854118 m³. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert us gallons to cubic meters
To convert us gallons to cubic meters, divide by 264.1720523581 (multiply by 0.0037854118). 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.
m³ = gal × 0.0037854118
US Gallons to Cubic Meters conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| US Gallons | Cubic Meters |
|---|---|
| 1 gal | 0.003785 m³ |
| 2 gal | 0.007571 m³ |
| 3 gal | 0.011356 m³ |
| 5 gal | 0.018927 m³ |
| 10 gal | 0.037854 m³ |
| 20 gal | 0.075708 m³ |
| 25 gal | 0.094635 m³ |
| 50 gal | 0.189271 m³ |
| 100 gal | 0.378541 m³ |
| 500 gal | 1.892706 m³ |
| 1,000 gal | 3.785412 m³ |
What is a us gallon?
Exactly 231 cubic inches — smaller than the imperial gallon.
What is a cubic meter?
The SI volume unit: 1,000 litres. Used for shipping and gas metering.
The formula
m³ = gal × 0.0037854118
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 US Gallons to Cubic Meters
- Type the number of us gallons you want to convert.
- Read the result in cubic meters 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 cubic meters to us gallons page.
US Gallons to Cubic Meters — frequently asked questions
How many cubic meters are in a us gallon?
One us gallon equals 0.0037854118 m³. m³ = gal × 0.0037854118
What is the formula to convert us gallons to cubic meters?
The formula is m³ = gal × 0.0037854118. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert cubic meters back to us gallons?
Divide instead of multiplying: one cubic meter is 264.1720523581 gal. 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 us gallons to cubic meters 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
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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