Volume Converter
Convert liters to gallons, ml to fluid ounces, cups to milliliters and more instantly.
This volume converter turns any capacity measurement into another unit as you type. It handles the conversions people search for in the kitchen and at the pump — litres to gallons for fuel, millilitres to fluid ounces for drinks, and cups to millilitres for recipes — across metric, US and imperial units.
About the volume converter
Volume measures how much space a substance occupies. The metric system uses litres and millilitres (plus cubic metres and cubic centimetres), while cooking and fuel in the US and UK use gallons, quarts, pints, cups, fluid ounces, tablespoons and teaspoons. A frequent source of confusion is that US and imperial (UK) gallons and pints are different sizes, which this tool keeps separate.
Every value is anchored to the litre. One US gallon equals exactly 3.785411784 litres, while one imperial gallon is 4.54609 litres — about 20% larger. A US cup is 236.588 ml and a US fluid ounce is 29.5735 ml. Because recipes and fuel prices constantly mix these systems, seeing a single value in every unit at once removes the guesswork.
How to use this volume converter
- Type the volume you want to convert into the value box.
- Choose the unit you are converting from (for example, litres).
- Choose the unit you want the answer in (for example, US gallons).
- The converted volume appears immediately as you type.
- Swap the direction with the arrows, or check the grid to see every volume unit at once.
Volume conversion factors
Exact reference factors used by this converter:
Supported volume units
- m³Cubic metre
- LLitre
- mLMillilitre
- galUS gallon
- qtUS quart
- ptUS pint
- cupUS cup
- fl ozUS fluid ounce
- tbspUS tablespoon
- tspUS teaspoon
- gal (UK)Imperial gallon
- pt (UK)Imperial pint
Frequently asked questions
How do I convert liters to gallons?
For US gallons, divide litres by 3.785412 (or multiply by 0.264172). So 10 litres ≈ 2.64 US gallons. For imperial gallons, divide by 4.54609 instead.
How many ml are in a fluid ounce?
One US fluid ounce is about 29.5735 millilitres. An imperial (UK) fluid ounce is slightly smaller at 28.4131 ml. This converter uses US fluid ounces by default.
How do I convert cups to ml?
One US cup equals about 236.588 millilitres. Multiply the number of cups by 236.588 to get millilitres, or divide ml by 236.588 to get cups.
Why are US and UK gallons different?
They were standardised separately. A US gallon is 3.785 litres while an imperial (UK) gallon is 4.546 litres — roughly 20% larger. Always check which gallon a figure refers to, especially for fuel economy.
Is a litre the same as a kilogram?
Only for pure water at 4 °C, where one litre weighs about one kilogram. For other liquids the weight differs because density varies, so volume and mass are not interchangeable in general.