Volume Converter

One US gallon equals exactly 3.785411784 litres. This is the legal definition used in the United States for liquid measurement. Do not confuse it with the UK (imperial) gallon, which equals 4.54609 litres.

The US gallon is 3.785411784 litres, while the UK (imperial) gallon is 4.54609 litres. The UK gallon is about 20% larger. Fuel economy figures stated in "mpg" differ significantly between the two countries because of this difference.

There are exactly 1,000 millilitres (ml) in 1 litre (l). This is a base SI unit relationship: 1 l = 1 dm³ = 1,000 ml = 0.001 m³.

One cubic metre equals exactly 1,000 litres (1 m³ = 1,000 l = 1,000,000 ml). This relationship is fundamental in engineering, plumbing and hydrology when calculating water volumes.

One US fluid ounce equals approximately 29.5735 ml. The UK fluid ounce is slightly larger at approximately 28.4131 ml. This converter uses the US fluid ounce, which is standard in American recipes.

One US cup equals 0.2365882365 litres, or approximately 236.59 ml. It is exactly 8 US fluid ounces. This unit is widely used in American and Canadian cooking recipes.

One US liquid pint equals approximately 473.18 ml (0.473176473 litres). The UK (imperial) pint is larger at 568.26 ml. Always check which pint is used in a recipe or specification.

To convert litres to US gallons: divide by 3.785412. To convert to UK gallons: divide by 4.54609. For example, 10 litres ÷ 3.785412 ≈ 2.642 US gallons or 10 ÷ 4.54609 ≈ 2.200 UK gallons.

If the tank capacity is given in US gallons: 50 × 3.785412 ≈ 189.27 litres. If it is UK gallons: 50 × 4.54609 ≈ 227.30 litres. Always confirm which gallon system is used in the vehicle specification.

The converter uses internationally accepted exact or high-precision conversion factors (e.g. 1 US gal = 3.785411784 l, 1 UK gal = 4.54609 l). Results are rounded to 6 decimal places. For metrology or legal measurement, refer to the official standards of the relevant national body (NIST, BIPM, etc.).