US Gallons to Cubic Decimeters
Convert us gallons to cubic decimeters instantly. 1 gal = 3.785411784 dm³. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert us gallons to cubic decimeters
To convert us gallons to cubic decimeters, multiply by 3.785411784. 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.
dm³ = gal × 3.785411784
US Gallons to Cubic Decimeters conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| US Gallons | Cubic Decimeters |
|---|---|
| 1 gal | 3.785412 dm³ |
| 2 gal | 7.570824 dm³ |
| 3 gal | 11.356235 dm³ |
| 5 gal | 18.927059 dm³ |
| 10 gal | 37.854118 dm³ |
| 20 gal | 75.708236 dm³ |
| 25 gal | 94.635295 dm³ |
| 50 gal | 189.270589 dm³ |
| 100 gal | 378.541178 dm³ |
| 500 gal | 1,892.71 dm³ |
| 1,000 gal | 3,785.41 dm³ |
What is a us gallon?
Exactly 231 cubic inches — smaller than the imperial gallon.
What is a cubic decimeter?
Exactly one litre, by definition.
The formula
dm³ = gal × 3.785411784
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 Decimeters
- Type the number of us gallons you want to convert.
- Read the result in cubic decimeters 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 decimeters to us gallons page.
US Gallons to Cubic Decimeters — frequently asked questions
How many cubic decimeters are in a us gallon?
One us gallon equals 3.785411784 dm³. dm³ = gal × 3.785411784
What is the formula to convert us gallons to cubic decimeters?
The formula is dm³ = gal × 3.785411784. 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 decimeters back to us gallons?
Divide instead of multiplying: one cubic decimeter is 0.2641720524 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 decimeters 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