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Volume Converter

A volume converter for ml to oz, cups to ml, litres, pints and gallons — with US and imperial units kept separate.

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Is a US pint the same as a UK pint?

No. A US pint is 473 ml and an imperial pint 568 ml — about 20% larger. Curiously the imperial fluid ounce is the smaller of the two, because an imperial pint is 20 fluid ounces where a US pint is 16.

Cost
Free, no limits
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None — runs on your device
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Not required
Works offline
Yes, once loaded

How to convert litres to gallons

  1. Enter the value

    Type the number into the Value box; the result updates as you type.

  2. Choose the units

    Pick From and To — litres and US gallons to begin with, or cups, pints and fluid ounces — US and UK measures are listed separately. The swap button between them flips the direction.

  3. Read every unit at once

    The All units table below the result shows the value in every volume unit.

Examples

  • 1 US cup236.59 ml

    A metric cup is 250 ml, and a UK recipe may mean either.

  • 1 imperial gallon4.546 litres

    A US gallon is 3.785 litres — a 20% difference.

Key features of the Volume Converter

  • Converts between 14 volume units
  • Converts as you type, in both directions
  • Metric and imperial in the same list
  • Runs entirely in your browser

Supported formats

Units

  • Millilitres
  • Litres
  • Cubic metres
  • Cubic feet
  • Teaspoons (US)
  • Tablespoons (US)
  • Fluid ounces (US)
  • Cups (US)
  • Pints (US)
  • Quarts (US)
  • Gallons (US)
  • Fluid ounces (UK)
  • Pints (UK)
  • Gallons (UK)

When should you use this?

  • Following a recipe written for the other system.
  • Converting fuel economy or fuel volume figures.
  • Scaling a recipe up or down accurately.

Limitations

  • Conversions go through a base unit, so a value converted from one unit to another and back can differ in the last decimal place. That is floating-point arithmetic, not a defect, and it is far below the precision of any real measurement.
  • Results are displayed rounded for readability. If you need a specific number of significant figures, round the displayed value yourself rather than assuming the display is exact.
  • Converting a measurement cannot make it more precise than it was. A length measured to the nearest centimetre is still that precise after conversion, however many decimal places appear.
  • US and imperial units of the same name differ substantially. A US pint is 473 ml and an imperial pint is 568 ml — a 20% gap that ruins a recipe.
  • Volume and mass are not interchangeable. A cup of flour and a cup of water weigh very different amounts, so a recipe in grams cannot be converted here without knowing the ingredient's density.

Troubleshooting

The answer disagrees with another converter

Usually a different definition of the same unit name — US versus imperial, or a short versus a long ton. Check which variant each tool means before assuming one is wrong.

The last decimal place changes on a round trip

Conversion factors are not exact in binary floating point. The error is around one part in ten thousand billion, which no physical measurement can detect.

Common mistakes to avoid

  • Assuming a unit name is unambiguous. It very often is not.
  • Rounding partway through a multi-step calculation instead of at the end.

Pro tips

Tips for better results

  • US and UK units

    The same unit name can mean two amounts

    Check which system a unit belongs to before trusting it. Several unit names mean different amounts in the US and the UK.

  • Working method

    Write the unit beside every number

    Carry the unit through your working rather than converting at the end. Most unit errors happen when a number is written down without one.

  • Baking

    Weigh ingredients rather than measuring by cup

    For baking, weigh rather than measure by volume where you can. Cup measurements of flour vary by up to 20% depending on how the cup was filled.

Standards and terms behind the Volume Converter

The named things this tool works with, and the documents that define them.

SI unitsSpecification
The international system of units, maintained by the BIPM, which fixes the metre, kilogram, second and kelvin. Reference: SI units
Imperial and US customary unitsSpecification
Inches, feet, pounds, gallons and Fahrenheit — still standard in the United States and common in the UK.

Also searched as: litres to gallons, us gallons vs imperial gallons, cups to ml for baking.

US and imperial units are not the same

This is where volume conversion goes wrong most often. Units that share a name differ substantially between the two systems:

  • Pint — 473 ml in the US, 568 ml imperial (20% larger)
  • Gallon — 3.785 L in the US, 4.546 L imperial
  • Fluid ounce — 29.57 ml in the US, 28.41 ml imperial

Curiously the imperial fluid ounce is the smaller of the two while the imperial pint is larger — because an imperial pint is 20 fluid ounces and a US pint is 16. Every unit here is labelled with its system for exactly this reason.

Cooking measurements

A US cup is 236.6 ml, usually rounded to 240 in nutrition labelling. A "metric cup" of 250 ml is standard in Australia and New Zealand, and UK recipes often work by weight instead. If a recipe's origin is unclear, weight is more reliable than volume — particularly for flour, where how tightly the cup is packed can change the amount by 20%.

Privacy

The Volume Converter runs entirely in your browser. What you enter and the result it produces stay on your own device — nothing is sent anywhere, because nothing needs to be.

You can confirm this rather than take our word for it: open your browser’s developer tools, watch the Network tab, and use the tool. No request carries your input. It also keeps working with the connection off.

Details are in the privacy policy.

More unit converters

What next?

For recipes given in grams and ounces rather than cups.

Convert weights

Volume Converter — questions

How do I convert liters to gallons?

Divide by 3.785411784, the exact number of litres in a US gallon: 10 litres is 2.64 US gallons. A UK gallon is larger, at 4.54609 litres, so check which gallon you mean.

How many millilitres are in a cup?

A US cup is 236.6 ml. An Australian or New Zealand metric cup is 250 ml. Nutrition labelling in the US rounds to 240 ml.

Is a US gallon the same as a UK gallon?

No. A US gallon is 3.785 litres and an imperial gallon is 4.546 litres — about 20% larger. Both units are listed separately above.

Why is a UK pint bigger than a US pint but a UK fluid ounce smaller?

Because an imperial pint is 20 fluid ounces and a US pint is 16. The imperial ounce is slightly smaller, but there are four more of them.

Should I measure baking ingredients by volume or weight?

Weight, wherever the recipe allows. A cup of flour can vary by 20% depending on how it is packed, which is enough to change a result noticeably.

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