Convert UK gallons to cubic inches

1 gal (UK)=277.419in³

Use the converter below to change any UK gallons value into cubic inches instantly — with formula, conversion table, and real-world examples.

You have

Equals

277.4194

Conversion formula

Forward

cubic inches = UK gallons × 277.419

Reverse

UK gallons = cubic inches × 0.003605

Example: 10 gal (UK) × 277.419 = 2,774.19 in³.

About both units

From

UK Gallon

gal (UK)

The UK imperial gallon equals 4.54609 litres exactly. Defined in 1824 as the volume of 10 pounds of water at 62 °F. Still used for fuel economy reporting in the UK and some older industrial contexts. The UK imperial gallon is about 20% larger than the US gallon.

Real-world: UK petrol sold by litre since 1995, but economy is quoted in UK mpg: a diesel car at 60 mpg (UK) uses 4.7 L/100 km.

Read full uk gallon reference →

Cubic Inch

in³

The cubic inch equals 16.387 cubic centimetres. Used in US automotive engineering for engine displacement (e.g., "350 cubic inch V8 = 5.7 L") and in firearms (bullet cartridges). Most of the rest of the world uses cc or litres.

Real-world: 350 cu in V8 = 5.7 L engine. 302 cu in Ford V8 = 4.9 L. Modern specs typically give litres.

Read full cubic inch reference →

UK Gallon to Cubic Inch conversion table

Common UK gallons to cubic inches values for quick reference.

UK Gallon (gal (UK))	Cubic Inch (in³)
1 gal (UK)	277.419 in³
2 gal (UK)	554.839 in³
5 gal (UK)	1,387.1 in³
10 gal (UK)	2,774.19 in³
20 gal (UK)	5,548.39 in³
50 gal (UK)	13,870.97 in³
100 gal (UK)	27,741.94 in³
200 gal (UK)	55,483.89 in³
500 gal (UK)	138,709.72 in³
1,000 gal (UK)	277,419.43 in³

Tips & common mistakes

Quick tips

1 UK gallon = 4.54609 L exactly = 160 UK fluid ounces.
1 UK gallon ≈ 1.201 US gallons.
UK mpg × 0.832 = US mpg (same car, different unit).

Avoid these

Comparing UK mpg with US mpg directly — UK figures are about 20% higher for the same car.
Using 4.5 L instead of 4.546 L for precise conversion.
Assuming modern UK car ads quote US gallons — they always use UK gallons.

Frequently asked questions

How many cubic inches in a uk gallon?

One uk gallon equals 277.419 cubic inches.

How do I convert UK gallons to cubic inches?

Multiply the uk gallon value by 277.419 to get the equivalent in cubic inches.

What is 100 UK gallons in cubic inches?

100 UK gallons equals 27,741.94 cubic inches.

Is a uk gallon bigger than a cubic inch?

Yes. 1 uk gallon equals 277.419 cubic inches, so one uk gallon is larger.

How to convert UK gallons to cubic inches without a calculator?

Multiply by 277.42 for a quick estimate; use a calculator for precise results.

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