How to Convert Litres to Gallons (US & UK)
One US gallon is about 3.79 litres; a UK gallon is 4.55. Learn the formulas, a quick table, and why US and imperial gallons differ.
To convert litres to US gallons, divide by 3.785. For example, 20 L ÷ 3.785 = 5.28 US gallons. For UK (imperial) gallons, divide by 4.546 instead.
The formulas
- US gallons = litres ÷ 3.78541
- UK gallons = litres ÷ 4.54609
- litres = gallons × the same number
Quick reference (US)
- 1 L ≈ 0.26 gal
- 5 L ≈ 1.32 gal
- 10 L ≈ 2.64 gal
- 20 L ≈ 5.28 gal
- 50 L ≈ 13.21 gal
US vs UK gallons
They are not the same: a US gallon is 3.785 L and a UK imperial gallon is 4.546 L — about 20% larger. Fuel economy and recipe volumes can be badly off if you use the wrong one, so always check which gallon a figure means.
Convert instantly
The unit converter handles litres, US gallons and millilitres with live two-way updates, all in your browser. Related: How to convert mL to cups.