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Convert between gallons, liters, cups, milliliters, and more with quick reference tables.
Volume is the amount of three-dimensional space a substance or object occupies, measured in units like liters, gallons, cups, and fluid ounces.
| Description | US | Metric |
|---|---|---|
| Teaspoon | 1 tsp | 5 mL |
| Tablespoon | 1 tbsp | 15 mL |
| Fluid ounce | 1 fl oz | 30 mL |
| Cup | 1 cup | 237 mL |
| Pint | 1 pt | 473 mL |
| Quart | 1 qt | 946 mL |
| Gallon | 1 gal | 3.79 L |
Multiply the number of gallons by 3.78541 to get liters.
L = gal × 3.78541
Multiply the number of liters by 0.264172 to get gallons.
gal = L × 0.264172
1 gallon = 4 quarts = 8 pints = 16 cups = 128 fl oz
Formula
L = gal (US) × 3.78541 | mL = L × 1,000L (liter) = SI unit of volume — 1 L = 1 dm³ = 1,000 mL
gal (US) = US liquid gallon = 3.78541 L (≠ UK Imperial gallon of 4.54609 L)
cup (US) = 236.588 mL — varies globally (UK cup = 284 mL; metric cup = 250 mL)
Worked Example
Convert 2.5 US gallons to liters and cups
Did you know? The liter is not a base SI unit — it's a derived unit equal to exactly 1 cubic decimeter (dm³). The US and UK still use their own separate 'gallon' units that differ by about 20%, causing confusion in fuel economy comparisons.
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