Volume Converter
Convert between litres, millilitres, gallons, cups, fluid ounces, cubic metres, and more.
Did this tool work for you?
How to use this calculator
- 1
Type the volume value in the "From" field.
- 2
Choose the unit you are converting from (e.g. litres).
- 3
Choose the unit you want as the result (e.g. US gallons).
- 4
The answer updates instantly. Swap the units with the ⇄ button to reverse.
Frequently asked questions
How many litres are in a gallon?
One US gallon equals 3.78541 litres. One UK (imperial) gallon equals 4.54609 litres. Make sure you select the correct gallon type for your needs.
How many millilitres are in a cup?
One US cup equals 236.588 millilitres. Note that the metric cup used in some countries (Australia, Canada) is 250 mL.
What is the difference between a US and UK fluid ounce?
A US fluid ounce is approximately 29.5735 mL. A UK (imperial) fluid ounce is 28.4131 mL. They are close but not the same.
How many tablespoons are in a cup?
There are 16 US tablespoons in one US cup. Each tablespoon is approximately 14.7868 mL.
How do I convert cubic metres to litres?
One cubic metre equals exactly 1,000 litres. Multiply cubic metres by 1,000 to get litres.
Volume unit conversion guide
How to use the volume
Use this volume to onvert between litres, millilitres, gallons, cups, fluid ounces, cubic metres, and more. Enter your values above and get your result in seconds. The tool is free, works on all devices, and keeps your data private — nothing is stored or shared.
How the volume works
The volume converter uses standard formulas used in unit conversion in science, engineering, cooking, and everyday use. Enter your inputs, and the tool calculates the result instantly in your browser. No server-side processing means your data stays on your device. Results update in real time as you change inputs.
US customary vs metric vs imperial volume
The metric system measures volume in litres and millilitres. The US uses cups, pints, quarts, and gallons. The UK uses a different set of imperial gallons and pints — a UK pint (568 mL) is larger than a US pint (473 mL). This often causes confusion in recipes and liquid purchases.
Key volume conversions
1 litre = 1,000 mL | 1 US gallon = 3.785 L | 1 UK gallon = 4.546 L | 1 US cup = 236.6 mL | 1 US fl oz = 29.57 mL | 1 US pint = 473.2 mL | 1 US quart = 946.4 mL | 1 cubic metre = 1,000 litres.
Where volume conversion matters
Cooking and baking require accurate volume conversions — especially when following recipes from other countries. Fuel economy uses litres vs gallons. Beverages, pharmaceuticals, and chemical products are sold with volume labels that vary by country. Industrial and construction work uses cubic metres and cubic feet.
Volume: how it works
Unit conversion matters across engineering, science, cooking, and everyday life. This tool applies internationally recognised conversion factors to deliver precise, instant results across all major unit systems — no manual lookup needed.
Who uses this tool?
Scientists, engineers, chefs, and international travellers use this tool daily to bridge the gap between different measurement systems. It eliminates the need to memorise conversion factors or hunt through reference tables.
Learn more from an authoritative source:
NISTLength Converter
Convert between metres, kilometres, feet, inches, miles, yards, and more length units instantly.
Inches to Feet Converter
Convert inches to feet instantly. See the result in feet and inches combined (e.g. 5'4"), decimal feet, and centimetres.
Weight & Mass Converter
Convert between kilograms, pounds, ounces, grams, stones, tonnes, and more weight units.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly.
Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →