Cubic Inches to Gallons Converter

Created by Anna Szczepanek, PhD
Reviewed by Luciano Mino
Last updated: Mar 11, 2022

Welcome to Omni's cubic inches to gallons converter, which allows you to quickly calculate cubic inches to gallons, and it is you who decides whether it is US gallons or UK gallons! As a bonus, we will show you the cubic inches to gallons formula and explain how to do this conversion by hand. Let's go!

Cubic inches to gallons formula

Gallon (gal) is a volume unit, and it can be either a US gallon or UK gallon. A US gallon is exactly 231 cu in (cubic inches, also in³), while a UK gallon is 277.4 cu in. Equivalently, 1 cu in corresponds to 0.0043 US gallon and 0.0036 UK gallon. As you can see, UK gallons are slightly bigger than US gallons.

How do I convert cubic inches to US gallons?

To convert cubic inches to US gallons:

  1. Write down the volume in cubic inches.
  2. Multiply this number by 0.0043.
  3. That's it! The number you got is the volume expressed in US gallons.

How do I convert cubic inches to UK gallons?

To convert cubic inches to UK gallons:

  1. Write down the volume in cubic inches.
  2. Multiply this number by 0.0036.
  3. That's it! The number you got is the volume expressed in UK gallons.

FAQ

How do I convert 1 cubic inch to gallons?

To calculate 1 cubic inch to gallons:

  1. Write down the volume in cubic inches.
  2. Multiply this number by 0.0043 if you want to convert it into US gallons.
  3. Multiply this number by 0.0036 if you want to convert it into UK gallons.
Anna Szczepanek, PhD
cu in
US gal
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