US Gallon (gal (US))
The US liquid gallon is defined as exactly 231 cubic inches, which is 3.785411784 L.
Symbol: gal (US) (ASCII: gal)
Quantity: volume (capacity)
SI relation: 1 gal (US) = 0.003785411784 m³ (exact)
Derivation: 1 US gal = 231 in³ = 231 × (0.0254 m)³ = 0.003785411784 m³
Exact: yes, by definition
Typical uses
- Fuel, water and chemical volumes in the US
- Tank, drum (55 gal) and IBC (275/330 gal) capacities
- Basis of GPM pump ratings
Convert US gallons to other units
| Conversion | 1 gal (US) equals | Reverse |
|---|---|---|
| US gallon to cubic meter | 0.003785411784 m³ | cubic meter to US gallon |
| US gallon to liter | 3.785411784 L | liter to US gallon |
| US gallon to milliliter | 3785.411784 mL | milliliter to US gallon |
| US gallon to cubic foot | 0.1336805556 ft³ | cubic foot to US gallon |
| US gallon to cubic centimeter | 3785.411784 cm³ | cubic centimeter to US gallon |
| US gallon to cubic inch | 231 in³ | cubic inch to US gallon |
| US gallon to imperial gallon | 0.8326741846 gal (imp) | imperial gallon to US gallon |
Open the Volume Converter to convert any value between all units.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "gallon [U.S.] (gal)".
- NIST Handbook 44, Appendix C: General Tables of Units of Measurement, National Institute of Standards and Technology , Appendix C.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). US Gallon (gal (US)). Retrieved October 17, 2026, from https://scientificconverters.com/units/us-gallon/
IEEE
Scientific Converters, "US Gallon (gal (US))," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/us-gallon/