Gallon Calculator - Convert Gallons to Liters, Ounces, Cups and More

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The US liquid gallon is used for everyday liquids in the United States. The UK imperial gallon is used in the UK and some Commonwealth countries. The US dry gallon is used for dry goods.
Choose which unit your source value is in. All other fields update automatically.
The volume you want to convert. Enter any positive number.
Water density changes with temperature. Select the temperature closest to your use case to get an accurate weight for that volume of water.
Gallons
1

Volume in the selected gallon type

Litres (L)3.785412
Millilitres (mL)3,785.4118
Centilitres (cL)378.5412
Hectolitres (hL)0.037854
Cubic metres (m³)0.003785
Cubic centimetres (cm³)3,785.4118
Cubic inches (in³)231
Cubic feet (ft³)0.133681
Cubic yards (yd³)0.004951
US quarts (qt)4
US pints (pt)8
US cups16
US fl oz128
US tablespoons255.9998
US teaspoons767.9995
UK quarts3.3307
UK pints6.6614
UK fl oz133.2279
Water weight (kg)3.7741
Water weight (lb)8.3204
Litres3.785412
US quarts4
US pints8
US cups16

1.0000 US liquid gallon(s) = 3.7854 L

  • 1.0000 US liquid gallon(s) = 3.7854 litres.
  • That equals 128.0 US fluid ounces or 16.0 US cups.
  • As water, this volume weighs approximately 3.774 kg (8.320 lb) at the selected temperature.
  • Room-temperature water is slightly less dense than at 4 degC.
  • A US liquid gallon is about 20% smaller than a UK (imperial) gallon.

Next stepUse the water temperature selector to see how density shifts the weight of a liquid at different conditions, or change the gallon type to compare US vs UK measurements.

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