Volume Converter
Convert between metric and US volumes — milliliters to gallons — using exact US-customary definitions.
Common conversions
| From | Equals |
|---|---|
| 1 US gallon | 3.785 L = 4 quarts = 8 pints = 16 cups |
| 1 liter | ≈ 0.264 US gal = 33.8 US fl oz |
| 1 US cup | ≈ 236.6 mL = 8 fl oz = 16 tbsp |
| 1 US fluid ounce | ≈ 29.57 mL |
Frequently asked questions
Is a US gallon the same as a UK (imperial) gallon?
No — the imperial gallon is about 20% larger: 4.546 L vs 3.785 L. This tool uses US-customary units; UK recipes and fuel figures use imperial.
Are these factors exact?
Yes. The US gallon is defined as exactly 231 cubic inches = 3.785411784 L, and every smaller unit (quart, pint, cup, fl oz, tbsp, tsp) is an exact fraction of it.
Which cup does this use?
The US customary cup (236.59 mL). For cooking-specific units, including the 250 mL metric cup, try our cooking measurement converter.
Last updated: 2026-07-13