Convert US Gallons to Liters
1 US gallon (gal (US)) equals 3.785411784 liters (L).
1 gal (US) = 3.785411784 L
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk US gallon to liter converter to paste a column from Excel.
How to Convert US Gallon to Liter
- 1 gal (US) = 3.785411784 L
- 1 L = 0.2641720524 gal (US)
- Example: convert 15 gal (US) to L: 15 gal (US) = 15 × 3.785411784 L = 56.78117676 L
Formula
L = gal (US) × 3.785411784
Derivation from SI units:
- 1 US gal = 231 in³ = 231 × (0.0254 m)³ = 0.003785411784 m³
- 1 L = 1 dm³ = (0.1 m)³ = 10⁻³ m³
- 1 gal (US) = 0.003785411784 m³ ÷ 0.001 m³ per L = 3.785411784 L
Both units are defined exactly, so the factor is exact. US Gallon definition: US gallon; Liter definition: liter.
Worked examples
- A 55 gal (US) drum holds 208.1976481 L.
55 gal (US) × 3.785411784 = 208.1976481 L - A 5 gal (US) water jug holds 18.92705892 L.
5 gal (US) × 3.785411784 = 18.92705892 L
US Gallon to Liter conversion table
| US Gallons (gal (US)) | Liters (L) |
|---|---|
| 0.25 gal (US) | 0.946352946 L |
| 0.5 gal (US) | 1.892705892 L |
| 1 gal (US) | 3.785411784 L |
| 2 gal (US) | 7.570823568 L |
| 2.5 gal (US) | 9.46352946 L |
| 5 gal (US) | 18.92705892 L |
| 10 gal (US) | 37.85411784 L |
| 15 gal (US) | 56.78117676 L |
| 20 gal (US) | 75.70823568 L |
| 25 gal (US) | 94.6352946 L |
| 50 gal (US) | 189.2705892 L |
| 55 gal (US) | 208.1976481 L |
| 100 gal (US) | 378.5411784 L |
| 275 gal (US) | 1040.988241 L |
| 330 gal (US) | 1249.185889 L |
| 500 gal (US) | 1892.705892 L |
| 1000 gal (US) | 3785.411784 L |
| 10000 gal (US) | 37854.11784 L |
Where it's used
US fuel, chemical and water volumes are converted to litres for metric labelling, safety data sheets and dosing calculations.
US Gallon to other volume units
| Conversion | 1 gal (US) equals |
|---|---|
| US gallon to cubic meter | 0.003785411784 m³ |
| US gallon to liter | 3.785411784 L |
| US gallon to milliliter | 3785.411784 mL |
| US gallon to cubic centimeter | 3785.411784 cm³ |
| US gallon to cubic foot | 0.1336805556 ft³ |
| US gallon to cubic inch | 231 in³ |
| US gallon to imperial gallon | 0.8326741846 gal (imp) |
Frequently asked questions
Is a gallon 4 liters?
Close: 1 US gallon = 3.785411784 L exactly. An imperial gallon is 4.54609 L.
How many liters are in 1 US gallon?
1 gal (US) = 3.785411784 L.
How do I convert US gallons to liters?
Multiply the value in gal (US) by 3.785411784. For example, 15 gal (US) × 3.785411784 = 56.78117676 L.
Is the gal (US) to L conversion exact?
Yes. Both units are defined exactly, and 1 gal (US) is exactly 3.785411784 L.
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.
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8, non-SI units accepted for use with the SI.
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). Convert US Gallons to Liters. Retrieved October 17, 2026, from https://scientificconverters.com/volume/us-gallons-to-liters/
IEEE
Scientific Converters, "Convert US Gallons to Liters," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/volume/us-gallons-to-liters/