Volume Converter
Convert gallons, quarts, cups and fluid ounces to liters and milliliters, cubic feet and yards, UK (imperial) measures and barrels.
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In Every Unit
| Unit | Value |
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How to Convert Volume Units
The US gallon is defined as 231 cubic inches, which is exactly 3.785411784 liters. The rest of the US liquid measures divide it down: 4 quarts, 8 pints, 16 cups or 128 fluid ounces per gallon.
L = gal × 3.785411784 mL = fl oz × 29.5735295625
Worked Example
Common Conversions
| From | Equals |
|---|---|
| 1 gal | 3.785412 L |
| 1 L | 0.2641721 gal |
| 1 fl oz | 29.57353 mL |
| 1 mL | 0.03381402 fl oz |
| 1 cup | 236.5882 mL |
| 1 qt | 0.9463529 L |
| 1 ft³ | 7.480519 gal |
| 1 UK gal | 1.20095 gal |
Unit Definitions
| Unit | Equals | Exact? |
|---|---|---|
| Milliliters (mL) | 0.001 L | Exact |
| Liters (L) | 1 L | Exact |
| Cubic meters (m³) | 1,000 L | Exact |
| US teaspoons (tsp) | 0.004928921594 L | Exact |
| US tablespoons (tbsp) | 0.01478676478 L | Exact |
| US fluid ounces (fl oz) | 0.02957352956 L | Exact |
| US cups (cup) | 0.2365882365 L | Exact |
| US pints (pt) | 0.473176473 L | Exact |
| US quarts (qt) | 0.946352946 L | Exact |
| US gallons (gal) | 3.785411784 L | Exact |
| Cubic inches (in³) | 0.016387064 L | Exact |
| Cubic feet (ft³) | 28.31684659 L | Exact |
| Cubic yards (yd³) | 764.554858 L | Exact |
| UK fluid ounces (UK fl oz) | 0.0284130625 L | Exact |
| UK pints (UK pt) | 0.56826125 L | Exact |
| UK gallons (UK gal) | 4.54609 L | Exact |
| Oil barrels (42 gal) (bbl) | 158.9872949 L | Exact |
| Acre-feet (ac·ft) | 1,233,481.837999999989 L | Exact |
Factors follow NIST Special Publication 811, Appendix B. "Exact" means the unit is defined as that value; results are rounded only for display.
Tips
UK (imperial) gallons are 4.54609 L, about 20% bigger than US gallons, but a UK fluid ounce is slightly smaller than a US one. Nutrition labels use a rounded 240 mL "legal" cup; this page uses the exact customary cup (236.59 mL).