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Volume converter

Convert litres, cups, and gallons without mixing US and imperial.

This tool processes files and text locally in your browser. Your content is not uploaded or stored by this site.

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What this tool does

The cubic metre is the base. A litre is 0.001 m³. US liquid gallons are 3.785411784 L; imperial gallons are 4.54609 L. Cooking teaspoons and tablespoons are US customary, not the metric 5 mL spoon.

How to use it

  1. Enter the volume.
  2. Pick two units. Read the labels for US versus imperial.
  3. Convert and copy the JSON.

Supported input

  • A number and two volume units from the menu

Output

  • JSON with the converted volume plus every other unit in the family

Privacy

This tool processes files and text locally in your browser. Your content is not uploaded or stored by this site.

ConvertPass does not include your input in analytics, URLs, or error reports. Encoding: Decimal numbers / SI cubic metre. Limit: A single volume (4.0 KB).

Limitations

  • Dry pints, oil barrels, and board-feet are not offered.
  • A ‘cup’ here is the US customary cup (16 US fl oz), not the metric 250 mL cup.
  • Nutrition labels that round millilitres will not match this calculator to the last drop.

Example

Input
1 US gallon → litres
Output
{
  "result": 3.785411784,
  "formatted": "1 gal US = 3.785411784 L"
}

Troubleshooting

A UK recipe looks twice as large
An imperial pint is 20 imperial fluid ounces, not 16 US fl oz. Pick the imperial pint, not the US pint.

FAQ

Are millilitres and cubic centimetres the same?

Yes for this converter. 1 mL = 1 cm³.

Which gallon does a US car use?

The US liquid gallon. Fuel economy lives in the fuel converter, not here.

Can I convert a barrel of oil?

No. Oil barrels are a trade unit ConvertPass will not pretend to standardise.

Are cooking spoons metric?

No. They are US customary. A metric teaspoon is often 5 mL; this teaspoon is 4.92892159375 mL.

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Related formats

Last reviewed 16 August 2026. Report a problem. Reports do not include your input.