About the Volume Converter
This volume converter changes a liquid or space measurement from one unit to another. It handles metric units (milliliters, liters, cubic meters), US kitchen and liquid units (teaspoons, tablespoons, fluid ounces, cups, pints, quarts, gallons), the UK gallon, and cubic inches and cubic feet.
Enter an amount, pick the units, and the answer appears with the factor used. The table underneath shows the same volume in every unit, which helps when scaling recipes, mixing garden products or checking a tank size.
How to use it
- Type the amount in Value.
- Choose the unit you have in From.
- Choose the unit you want in To.
- Read the answer, or use the table to see the amount in every unit.
Conversion formula
Every unit is stored as an exact number of liters:
result = value × (liters per From unit) ÷ (liters per To unit)
- 1 US gallon = 231 cubic inches = 3.785411784 L
- 1 UK (imperial) gallon = 4.54609 L
- 1 US quart = 1/4 gallon = 0.946352946 L
- 1 US pint = 1/8 gallon = 0.473176473 L
- 1 US cup = 8 US fl oz = 236.5882365 mL
- 1 US fluid ounce = 29.5735295625 mL
- 1 US tablespoon = 1/2 fl oz = 14.78676478125 mL
- 1 US teaspoon = 1/3 tablespoon = 4.92892159375 mL
- 1 cubic inch = 16.387064 mL; 1 cubic foot = 28.316846592 L
The cup used here is the US customary cup of 8 fluid ounces. US nutrition labels use a rounded 240 mL cup, and metric cups in some countries are 250 mL.
Common volume conversions
| From | Equals |
|---|---|
| 1 US gallon | 3.78541 L = 4 qt = 8 pt = 16 cups = 128 fl oz |
| 1 liter | 33.814 US fl oz = 0.264172 US gal |
| 1 UK gallon | 4.54609 L = 1.20095 US gal |
| 1 US cup | 16 tbsp = 48 tsp |
| 1 tablespoon | 3 teaspoons |
| 1 cubic foot | 7.48052 US gal = 28.3168 L |
| 1 cubic meter | 1,000 L = 264.172 US gal |
US vs UK gallons and worked examples
The US gallon and the UK gallon are different sizes. A UK gallon is about 20% larger, so fuel economy in miles per UK gallon looks higher than the same car's figure in miles per US gallon. Pick the right one in the list before you convert. Pints, quarts, cups and fluid ounces in this converter are all US sizes.
Gallons to liters. 5 US gallons × 3.785411784 = 18.93 L.
Liters to fluid ounces. A 2 L bottle × 33.814 = 67.6 US fl oz.
Tank size. A tank holding 10 cubic feet holds 10 × 7.48052 = 74.8 US gallons.
Converting cups of flour or sugar into grams depends on the ingredient, not just the volume. Use the cups to grams converter for that.
Frequently asked questions
How many liters are in a gallon?
A US gallon is 3.785411784 liters. A UK (imperial) gallon is 4.54609 liters.
How many cups are in a gallon?
There are 16 US cups in a US gallon, along with 4 quarts, 8 pints and 128 fluid ounces.
How many tablespoons are in a cup?
A US cup holds 16 tablespoons, or 48 teaspoons.
How many ounces are in a liter?
A liter is about 33.814 US fluid ounces.
Why is a UK gallon bigger than a US gallon?
They come from different historical definitions. The US kept an older wine gallon of 231 cubic inches, while the UK redefined its gallon in 1824, ending up at 4.54609 liters.
Last updated October 24, 2026. Results are estimates for education and planning — see our disclaimer.