How to convert volumes
- Enter the value.
- Choose the From and To units: milliliters, liters, cubic meters, US teaspoons, tablespoons, fluid ounces, cups, pints, quarts and gallons, or UK gallons.
- Read the result, the exact factor and a table of the same volume in every unit.
How it works
Each unit is stored as an exact number of liters. All US measures are built from the gallon, defined as 231 cubic inches or exactly 3.785411784 liters, and divided by fixed ratios.
| US unit | Fraction of a gallon | Exact milliliters |
|---|---|---|
| teaspoon | 1/768 | 4.92892159375 |
| tablespoon | 1/256 | 14.78676478125 |
| fluid ounce | 1/128 | 29.5735295625 |
| cup | 1/16 | 236.5882365 |
| pint | 1/8 | 473.176473 |
| quart | 1/4 | 946.352946 |
The UK imperial gallon is separate and defined as exactly 4.54609 liters.
Worked example
A recipe from the US calls for 3 cups of milk. How much is that in milliliters and liters?
- Milliliters: 3 × 236.5882365 = 709.76 ml.
- Liters: 0.70976 L.
- If you use a 250 ml metric cup, three cups is 750 ml, about 6 percent more.
For fuel, a 12 gallon tank holds 45.42 liters in US gallons, but 54.55 liters if the car manual means UK gallons.
Cooking and fuel tips
- Always check whether a recipe means US, UK or metric cups.
- For liquids, a jug with a milliliter scale is more precise than cups.
- Fuel economy in miles per gallon differs between the US and UK for the same car, because the gallons are different sizes.
Popular pairs
Open liters to gallons or cups to ml for ready tables of common values. Moving on to other measures? Try the area converter or the temperature converter for oven settings.
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