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Litres to Gallons

Litres to Gallons Converter

Convert litres to gallons and back instantly. Choose UK (imperial) or US gallons — 1 UK gallon is 4.54609 litres and 1 US gallon is 3.78541 litres, so every conversion is exact.

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litres ↔ gallons

UK gallon = 4.54609 L · US gallon = 3.78541 L.

Converted volume
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    1 UK gallon = 4.54609 L; 1 US gallon = 3.78541 L. The UK gallon is about 20% larger than the US one.

    Litres and gallons

    The litre is the metric unit of volume; the gallon is imperial. The catch is that there are two different gallons. The UK (imperial) gallon is 4.54609 litres, while the smaller US gallon is 3.78541 litres — about 20% less. In Britain fuel is sold in litres but older drivers still think in imperial gallons, so this converter defaults to the UK gallon and lets you switch to US for American recipes, tanks or mpg figures.

    💡 Quick answer

    50 litres = 11.00 UK gallons (50 ÷ 4.54609) or 13.21 US gallons. A full 50-litre tank is therefore about 11 imperial gallons. Going the other way, 10 UK gallons = 45.46 litres.

    Litres to gallons reference table

    LitresUK gallonsUS gallons
    1 L0.220.26
    5 L1.101.32
    10 L2.202.64
    40 L8.8010.57
    50 L11.0013.21
    100 L22.0026.42

    Based on the exact factors 1 UK gallon = 4.54609 L and 1 US gallon = 3.78541 L.

    When you'll need this

    Filling a fuel tank, comparing a US mpg figure with a UK one, scaling an American recipe, or sizing a water butt or aquarium. To work out the petrol cost of a journey, the fuel cost calculator uses the UK gallon (4.546 L) automatically. For length, weight and temperature, the unit converter handles the rest.

    MB
    Reviewed by Mustafa Bilgic
    Founder, Calcu · Consumer-finance tools

    "The number-one trap here is the two gallons. A US gallon is a fifth smaller than ours, which is exactly why American mpg looks better than it really is. We let you pick the gallon so the answer is the one you actually mean."

    Frequently asked questions

    How many litres are in a gallon?

    A UK (imperial) gallon is 4.54609 litres, while a US gallon is smaller at 3.78541 litres. In the UK, the gallon you usually mean is the imperial one, so this converter defaults to it.

    How do I convert litres to gallons?

    For UK gallons, divide litres by 4.54609. For US gallons, divide by 3.78541. For example, 50 litres is 11.00 UK gallons or 13.21 US gallons.

    What's the difference between a UK and US gallon?

    The UK imperial gallon (4.54609 L) is about 20% larger than the US gallon (3.78541 L). This matters for fuel economy: a US mpg figure looks higher than the same car's UK mpg.

    How many gallons is 50 litres?

    50 litres is about 11.00 UK gallons or 13.21 US gallons. A typical car fuel tank of 50 litres therefore holds roughly 11 imperial gallons.

    How do I convert gallons to litres?

    Multiply UK gallons by 4.54609, or US gallons by 3.78541. For example, 10 UK gallons = 45.46 litres, while 10 US gallons = 37.85 litres.