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How to Use
1 Enter any numeric value in the 'Value' field
2 Select the unit you are converting from in the 'From unit' dropdown
3 Select the target unit in the 'To unit' dropdown
4 See the result instantly — click ⇄ to swap the two units
5 Browse the full conversion table below — click any row to set it as the target
Features
Converts between 20 volume units: mL, cL, dL, L, m³, cm³, ft³, in³, US/UK gallon, US/UK fl oz, US cup, US/UK pint, US/UK quart, US tablespoon, US teaspoon
US and UK variants kept separate (US gallon ≈ 3.785 L, UK gallon ≈ 4.546 L)
Full conversion table showing all units at once — click any row to set as target
Swap ⇄ button to instantly reverse the conversion direction
Handles very large and very small values with scientific notation
No sign-up, no ads, no data stored
Why it Matters
Volume measurement has two incompatible systems in everyday use: the metric system (millilitres, litres, cubic metres) used everywhere outside the US, and the imperial / US customary system (fluid ounces, cups, pints, quarts, gallons). Critically, US and UK gallons differ by about 20%, so a recipe from an American cookbook and one from a British one use different volumes even when both say 'gallon'. This converter handles all variants correctly and shows every unit at once so you can spot relationships immediately.
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Use Cases
Cooking & Baking
Convert US cups to mL or UK pints to litres when following international recipes
Engineering & Construction
Convert cubic metres to cubic feet for concrete volumes and tank capacities
Chemistry & Lab
Convert between mL, cL, dL and litres for precise solution preparation
Fuel Economy
Compare fuel tank sizes or consumption across US gallons and litres
Why volume units are confusing
Volume has more conflicting standards than almost any other quantity. The metric system (mL, L, m³) is internally consistent, but the US and UK both use “gallon,” “pint,” and “fluid ounce” for different sizes. A US pint is 473 mL; a UK pint is 568 mL. A US gallon is 3.785 L; a UK gallon is 4.546 L.
The conversion method
All conversions go through litres as the base unit. Each unit has an exact litre-equivalent, so converting from any unit to any other is a single multiply-then-divide operation.
Cooking note
US cup measurements in recipes are the US customary cup (≈ 236.6 mL). Metric recipes use 250 mL cups. The difference matters for precise baking — a full 8-cup batch would differ by about 107 mL between systems.
Frequently Asked Questions
How many litres in a US gallon vs a UK gallon?
One US gallon is exactly 3.785411784 litres. One UK (imperial) gallon is exactly 4.54609 litres. The UK gallon is about 20% larger. This difference matters in fuel economy too: US mpg and UK mpg use different gallon sizes, so a UK car rated at 40 mpg is not the same as a US car rated at 40 mpg.
How many ml in a US cup?
One US legal cup is 240 mL (used in US nutrition labelling). One US customary cup is 236.588 mL. This tool uses the customary cup. When following US recipes, 240 mL is a close enough working approximation.
What is the difference between a US fluid ounce and a UK fluid ounce?
A US fluid ounce is approximately 29.5735 mL. A UK fluid ounce is approximately 28.4131 mL — slightly smaller. There are 128 US fl oz in a US gallon and 160 UK fl oz in a UK gallon.
How do cubic centimetres relate to millilitres?
One cubic centimetre (cm³ or cc) is exactly equal to one millilitre (mL). This is why engine displacement is given in 'cc' or 'litres' interchangeably — a 2,000 cc engine is a 2-litre engine.
What is 1 cubic metre in litres?
Exactly 1,000 litres. One cubic metre is the volume of a cube with edges of 1 metre, and it holds exactly 1,000 litres of water (which is 1 metric tonne).