Volume Converter
Convert volume between liters, milliliters, gallons, cups, cubic meters, and more. Free online volume conversion tool.
About this calculator
Cooking, fuel, water and shipping all use different volume units. This converter handles litres, millilitres, cubic metres, cubic centimetres, US and UK gallons, quarts, pints, cups, fluid ounces, tablespoons, teaspoons and cubic feet.
Be careful with gallons: a US gallon is 3.785 litres but a UK gallon is 4.546 litres, which is 20% bigger. Cups also differ by country. The tool uses the US customary cup of 236.588 mL.
How to use it
- Type the Value.
- Choose the From Unit and To Unit.
- Press Convert.
Factors
Litres are the base. 1 US gallon = 3.785411784 L, 1 UK gallon = 4.54609 L, 1 US cup = 236.588 mL, 1 US fl oz = 29.5735 mL, 1 tbsp = 14.7868 mL and 1 tsp = 4.92892 mL. Formula: value × from ÷ to.
Worked example
Examples
| 5 litres | 1.32086 US gallons |
| 1 US gallon | 3.785 litres |
| 2 US cups | 473.18 mL |
| 1 UK gallon | 1.20095 US gallons |
| 1 cubic metre | 1,000 litres |
Tips and common mistakes
- For recipes, cups differ: US 236.6 mL, metric 250 mL, UK imperial 284 mL.
- 1 mL equals 1 cm³ and a litre is 1,000 cm³.
- Fuel: 1 US gallon is 3.785 L, so mpg numbers differ between US and UK.
- Weigh liquids if accuracy matters: 1 L of water is 1 kg.
- Check whether a gallon is US or UK before converting.
Frequently asked questions
How many litres are in a gallon?
3.785 litres for a US gallon and 4.546 litres for a UK gallon.
How many mL are in a cup?
236.588 for a US cup; 250 for a metric cup.
How many cubic centimetres in a litre?
1,000.
How many teaspoons are in a tablespoon?
3.
How many fluid ounces are in a US cup?
8.
What is 1 cubic metre in litres?
1,000 litres.