Convert liquid and dry volumes between metric units, US customary units used in recipes, and imperial gallons. Use it in the kitchen, for fuel and water tanks, or for any measurement that crosses the metric–imperial divide.
Formula
Result = Value × (litres per “from” unit) ÷ (litres per “to” unit)
A US gallon is exactly 3.785411784 L and is divided into 4 quarts, 8 pints, 16 cups or 128 fluid ounces. The imperial gallon is larger, at exactly 4.54609 L.
Common conversions
1 L ≈ 0.264 US gal · 1 US gal ≈ 3.785 L · 1 US cup ≈ 236.6 mL · 1 tablespoon ≈ 14.8 mL · 1 m³ = 1,000 L.
Frequently asked questions
How many litres are in a gallon?
A US gallon is about 3.785 litres; an imperial (UK) gallon is about 4.546 litres.
How many millilitres are in a cup?
A US cup is about 236.6 mL. Many recipes outside the US use a 250 mL metric cup.
Last updated · Calculations checked by automated tests· Editorial policy