Gallons to Liters Converter
1 US liquid gallon = 3.785411784 liters.
Conversion result
Liters = US liquid gallons × 3.785411784; US gallons = liters ÷ 3.785411784.
Primary source: NIST SP 811, Appendix B.8 conversion factors. Published SI table values may be rounded; this converter uses the exact underlying definitions. NIST Handbook 44, Appendix C supplies the underlying inch, pound and US liquid measure definitions. NIST SP 1038, footnote 19 defines the US cup, tablespoon and teaspoon in fluid ounces.
Worked example: 2 US liquid gallons × 3.785411784 = 7.570823568 liters.
Common conversion values
The table follows the selected direction. Results display up to 12 significant digits; exact definitions are used before display rounding.
| US liquid gallons | liters |
|---|---|
| 0.25 | 0.94635294600 |
| 0.5 | 1.8927058920 |
| 1 | 3.785411784 |
| 2 | 7.570823568 |
| 5 | 18.927058920 |
The US liquid gallon is 231 cubic inches. With the international inch exactly 2.54 cm, 231 × 2.54³ ÷ 1000 = 3.785411784 liters. An Imperial gallon is 4.54609 liters and is outside this page’s selected pair.
Conversions use the measure named on the label. A US customary cup is 236.5882365 mL, rather than a 240 mL nutrition-label cup or a 250 mL metric cup. Actual measuring vessels and ingredient packing may vary.
How to use this tool
Enter a quantity in US liquid gallons, choose the forward or reverse direction, and select Convert. Decimals, fractions such as 1/2, and mixed fractions such as 1 1/2 are supported.
Frequently asked questions
Which gallon does this converter use?
It uses the US liquid gallon, not the larger Imperial gallon or the US dry gallon.
Can I reverse the conversion or enter a fraction?
Yes. Choose the reverse direction on this same page. Enter a nonnegative decimal, fraction such as 3/4, or mixed fraction such as 1 1/2. Zero is accepted; the quantity and fraction components are limited to 10¹², and a denominator must be positive.
Is this converter free and private?
Yes. Conversions run on your device without uploading your entries or saving them to browser storage. There is no sign-up.