Cubic Inches to Gallons Converter

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The US gallon is 231 cubic inches by definition. The UK (imperial) gallon is about 277.42 cubic inches.
The volume in cubic inches you want to convert.
in³
Gallons
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US or UK gallons, depending on the gallon type selected

Cubic inches231in³
US fluid ounces128fl oz
US quarts4qt
Liters3.78542L
Milliliters3,785.42mL
Cubic feet0.133681ft³
US fl oz128
US quarts4
Liters3.78542

231 in³ = 1.0000 US gallons

  • 231 cubic inches equals 1.0000 US gallons.
  • The US gallon is exactly 231 cubic inches by legal definition, set in 1707 and codified in the Weights and Measures Act.
  • In liters: 3.785 L. In fluid ounces: 128.0 fl oz.

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