Cubic Decimeters to US Gallons
Convert cubic decimeters to us gallons instantly. 1 dm³ = 0.2641720524 gal. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert cubic decimeters to us gallons
To convert cubic decimeters to us gallons, divide by 3.785411784 (multiply by 0.2641720524). 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 = dm³ × 0.2641720524
Cubic Decimeters to US Gallons conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Cubic Decimeters | US Gallons |
|---|---|
| 1 dm³ | 0.264172 gal |
| 2 dm³ | 0.528344 gal |
| 3 dm³ | 0.792516 gal |
| 5 dm³ | 1.32086 gal |
| 10 dm³ | 2.641721 gal |
| 20 dm³ | 5.283441 gal |
| 25 dm³ | 6.604301 gal |
| 50 dm³ | 13.208603 gal |
| 100 dm³ | 26.417205 gal |
| 500 dm³ | 132.086026 gal |
| 1,000 dm³ | 264.172052 gal |
What is a cubic decimeter?
Exactly one litre, by definition.
What is a us gallon?
Exactly 231 cubic inches — smaller than the imperial gallon.
The formula
gal = dm³ × 0.2641720524
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 Decimeters to US Gallons
- Type the number of cubic decimeters 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 decimeters page.
Cubic Decimeters to US Gallons — frequently asked questions
How many us gallons are in a cubic decimeter?
One cubic decimeter equals 0.2641720524 gal. gal = dm³ × 0.2641720524
What is the formula to convert cubic decimeters to us gallons?
The formula is gal = dm³ × 0.2641720524. 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 decimeters?
Divide instead of multiplying: one us gallon is 3.785411784 dm³. 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 decimeters 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.
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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