Volume Converter

Volume Converter

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Quick answer

Free volume and capacity converters for litres, cubic metres, cubic feet, cubic inches, US gallons and imperial gallons - keeping the two gallon sizes properly apart.

Key facts

  • Litres, cubic metres, cubic feet, cubic inches and gallons
  • US and imperial gallons handled as the different units they are
  • Results update as you type
  • Runs in your browser
  • Free, no account

About these tools

These tools convert volume and capacity between metric and imperial units. They cover the cubic units used in engineering and shipping - cubic metres, cubic feet, cubic inches - and the gallons and litres used for liquids.

US gallons and imperial gallons are treated as separate units throughout, because they are: an imperial gallon is roughly twenty per cent larger, and confusing them is one of the most common conversion errors there is.

How to choose

Check first which gallon your figure uses, then pick the matching converter. If a source does not say, US gallons are the usual assumption for American data and imperial for older British data.

Frequently asked questions

What is the difference between a US gallon and an imperial gallon?

A US gallon is about 3.785 litres. An imperial gallon is about 4.546 litres - roughly 20 per cent larger. They are separate units and this site converts them separately.

Is a litre the same as a cubic decimetre?

Yes, exactly. One litre is defined as one cubic decimetre, which is one thousandth of a cubic metre.

Can I convert fuel economy figures with these?

Not directly. These convert volume alone. Fuel economy combines volume with distance, so you would convert each part separately.