Volume Unit Converter

Enter a value to convert between litres, gallons, millilitres and cups.

Results

1 gal =
3.7854118 L
Millilitre (cm³)
3,785.4118 ml
Cubic metre
0.0037854118 m³
Teaspoon (US)
768 tsp
Tablespoon (US)
256 tbsp
Fluid ounce (US)
128 fl oz
Cup (US)
16 cup
Pint (US)
8 pt
Gallon (UK)
0.83267418 gal (UK)
Cubic foot
0.13368056 ft³
1 gal in L
3.7854118

Cups and tablespoons in recipes, gallons at the pump, cubic metres on a water bill — all measure volume. This converter handles eleven units.

Watch out for US versus UK measures: a US gallon is 3.785 litres and a UK gallon is 4.546 litres. The cups, spoons and fluid ounces here are US measures.

How to calculate Volume conversion

  1. Enter the value you want to convert.
  2. Choose the units to convert from and to.
  3. Read the result and the same volume in the other units.

Volume conversion formula

  • 1 US gallon = 3.785411784 L
  • 1 US cup = 236.588 ml
  • 1 US fl oz = 29.5735 ml
  • 1 m³ = 1,000 L

Volume conversion example

2 cups of milk is 2 × 236.588 = 473 ml. A 15-gallon fuel tank holds 15 × 3.785 = 56.8 litres.

Volume conversion: common questions

How many ml are in a cup?

A US cup is 236.6 ml. A metric cup, used in Australia and elsewhere, is 250 ml — check where your recipe comes from.

How many ml are in a tablespoon?

A US tablespoon is 14.79 ml and a teaspoon 4.93 ml; in practice they are rounded to 15 and 5 ml.

How many litres are in a cubic metre?

1,000 litres — which for water is one tonne.