A recipe in millilitres, a fuel tank in gallons, a storage box in cubic feet — and the gallon on one side of the Atlantic is not the gallon on the other. This free volume converter switches between millilitres, litres, cubic metres, cubic feet, US gallons, UK gallons and fluid ounces, with the two gallons kept strictly apart. Everything runs in your browser, so nothing is uploaded and no signup is needed.
How to use this volume converter
Three quick steps — value, units, result.
Type the number you have, such as 20, 500 or 2.5.
Pick from litres, millilitres, cubic metres, cubic feet, US gallons, UK gallons or fluid ounces.
Confirm US or UK before reading the result — the difference is about 20%, far too large to ignore.
What this volume converter refuses to blur
Built to be free, private, and exact — right in your browser.
A US gallon is 3.78541 litres and a UK gallon is 4.54609 litres, so the tool treats them as different units and never offers a bare gallon.
One litre is exactly 1,000 cubic centimetres and 0.001 cubic metres, so liquid measures and cubic measures convert through the same base.
A US fluid ounce is 29.5735 millilitres, and the tool says so rather than letting it stand in for a weight ounce of 28.3495 grams.
One cubic metre is 35.3147 cubic feet — the length factor cubed — not 3.28, which is the length-only figure that trips people up.
Volume Converter FAQs
Short, direct answers to the questions readers ask most.
3.78541 litres. A UK gallon is larger, at 4.54609 litres, so always check which gallon a source means.
Exactly 1,000 litres, since one litre is 0.001 cubic metres.
No, not on its own. Litres measure volume and grams measure mass, so the answer depends on the liquid; only water gives a neat one litre to one kilogram.
A fluid ounce measures volume (29.5735 millilitres in the US system) while an ounce measures mass (28.3495 grams); they are different quantities.
Exactly 1,000 millilitres.
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