How to convert cubic inches to imperial gallons
To convert a measurement in cubic inches to imperial gallons, multiply the value by 0.00360465015. The conversion factor comes from the relationship between both units and the liter.
For example, to convert 5 in³ to imperial gallons: 5 × 0.00360465015 = 0.01802325075 imp gal.
What is a cubic inch?
A cubic inch is an imperial and US customary unit of volume equal to the space of a cube one inch on each side, exactly 16.387064 milliliters. The cubic inch was the traditional way to express American engine displacement (e.g. a '350 cubic inch' V8) before the metric liter became common. It remains in use in US manufacturing and packaging.
Common uses of cubic inches include: Classic and American V8 engine displacement; Packaging and box volume in the US; Woodworking and material volume; Compressor and pump specifications.
What is a imperial gallon?
An imperial gallon is a British unit of volume equal to exactly 4.54609 liters, about 20% larger than the US gallon. The imperial gallon was defined in 1824 as the volume of ten pounds of water. It is still used in the UK and several Commonwealth countries, which is why UK 'miles per gallon' figures look higher than US ones.
Common uses of imperial gallons include: Fuel and fuel-economy figures in the UK and Canada; Historical and Commonwealth liquid measures; Comparing UK vs US gallon quantities; Agricultural and industrial liquid volumes.
Cubic Inches to imperial gallons worked examples
Here are some common values converted:
1 in³ = 0.00360465015 imp gal 5 in³ = 0.01802325075 imp gal 10 in³ = 0.036046501499 imp gal 50 in³ = 0.180232507495 imp gal 100 in³ = 0.360465014991 imp gal
Frequently asked questions
How many imperial gallons are in one cubic inch?
One cubic inch (in³) equals 0.00360465015 imperial gallons (imp gal). Multiply any value in cubic inches by 0.00360465015 to convert to imperial gallons.
How do I convert cubic inches to imperial gallons?
Multiply the value in cubic inches by 0.00360465015. For example, 5 in³ × 0.00360465015 = 0.01802325075 imp gal.
How do I convert imperial gallons to cubic inches?
Multiply the value in imperial gallons by 277.419433, or divide by 0.00360465015. Use the swap button on the converter above to reverse the direction.
Is the cubic inch to imperial gallon conversion exact?
Conversions between metric volumes are exact by definition. US and imperial volumes are defined exactly relative to the liter, so these factors are exact.
What is the formula for cubic inches to imperial gallons?
The formula is: imp gal = in³ × 0.00360465015. This comes from the definition of both units relative to the liter.