# Volume converter

Convert litres, gallons, cups and more, US and UK

Use it at https://www.quicktoolz.com/tools/volume-converter. From QuickToolz.

To convert a volume, multiply it by the size of the first unit in litres, then divide by the size of the second. A US gallon is exactly 3.785411784 litres, and a UK gallon is exactly 4.54609 litres, so always check which one you mean.

## How it works

result = value × litres in first unit ÷ litres in second unit

US and UK units share names but not sizes. We label each one, so a US pint is never mixed up with a UK pint.

Worked example: To change 10 litres to US gallons: 10 ÷ 3.785411784 ≈ 2.64 gallons.

## Examples

| From | To |
| --- | --- |
| 1 Gallons (US) | ≈ 3.79 Litres |
| 1 Gallons (UK) | ≈ 4.55 Litres |
| 1 Litres | ≈ 0.26 Gallons (US) |
| 1 Cups (US) | ≈ 236.59 Millilitres |
| 1 Fluid ounces (US) | ≈ 29.57 Millilitres |
| 1 Tablespoons (US) | ≈ 14.79 Millilitres |

## What this tool doesn't cover

- Cups here are US cups. Many other countries use a 250 ml metric cup.
- Results show up to two decimal places.

## Questions

### How many litres are in a gallon?

A US gallon is about 3.785 litres. A UK gallon is about 4.546 litres.

### How many millilitres are in a cup?

A US cup is about 237 ml. A metric cup is 250 ml.

### Why are US and UK pints different?

They come from different gallons. A US pint is about 473 ml, and a UK pint is about 568 ml.

### How many cups are in a litre?

A litre is about 4.23 US cups, or 4 metric cups of 250 ml.

### How many ml are in a tablespoon?

A US tablespoon is about 14.8 ml, and a metric tablespoon is 15 ml. In Australia, a tablespoon is 20 ml.

## Sources

- [NIST Office of Weights and Measures](https://www.nist.gov/pml/owm)
- [BIPM: SI units](https://www.bipm.org/en/measurement-units)