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Cubic Inches to UK Gallons (in³ to imp gal) Converter

1 cubic inch (in³) = 0.00360465 UK gallons (imp gal). To convert cubic inches to UK gallons, multiply by 0.00360465: 25 in³ × 0.00360465 = 0.0901163 imp gal.

1 in³ = 0.0036046501 imp gal
Convert the other way: UK Gallons to Cubic Inches

Quick facts

How to convert cubic inches to UK gallons

  1. Take the value in cubic inches.
  2. Multiply it by 0.00360465 (the number of UK gallons in one cubic inch).
  3. Round the result to the precision you need.
imp gal = in³ × 0.00360465

Worked example: 25 in³ × 0.00360465 = 0.0901163 imp gal.

To convert UK gallons back to cubic inches, multiply by 277.419, or divide by 0.00360465.

Source: NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units).

Cubic Inches to UK Gallons conversion table

Cubic Inches to UK Gallons conversion table
Cubic Inches [in³]UK Gallons [imp gal]
0.01 in³0.0000360465 imp gal
0.1 in³0.000360465 imp gal
1 in³0.0036046501 imp gal
2 in³0.0072093003 imp gal
3 in³0.0108139504 imp gal
5 in³0.0180232507 imp gal
10 in³0.0360465015 imp gal
20 in³0.072093003 imp gal
50 in³0.1802325075 imp gal
100 in³0.360465015 imp gal
1000 in³3.6046501499 imp gal

in³ to imp gal chart from 1 to 100

UK Gallons to Cubic Inches conversion table

UK Gallons to Cubic Inches conversion table
UK Gallons [imp gal]Cubic Inches [in³]
0.01 imp gal2.7741943279 in³
0.1 imp gal27.7419432792 in³
1 imp gal277.4194327916 in³
2 imp gal554.8388655832 in³
3 imp gal832.2582983749 in³
5 imp gal1387.0971639581 in³
10 imp gal2774.1943279162 in³
20 imp gal5548.3886558324 in³
50 imp gal13870.9716395811 in³
100 imp gal27741.9432791622 in³
1000 imp gal277419.4327916215 in³

Cubic Inches vs UK Gallons

Cubic InchUK Gallon
Symbolin³imp gal
Equals1 in³ = 0.00360465 imp gal1 imp gal = 277.419 in³

What is a cubic inch?

The volume of a cube with 1-inch sides. Used in the US for small mechanical parts and engine displacement.

What is a UK gallon?

The imperial gallon, defined as exactly 4.54609 litres (UK Weights and Measures Act 1985); about 20% larger than the US gallon. Used in the UK and Canada for fuel economy (miles per gallon), garden and aquarium volumes, and older fuel prices.

Frequently asked questions

How many UK gallons are in a cubic inch?

There are 0.00360465 UK gallons in 1 cubic inch (1 in³ = 0.0036046501 imp gal).

How many cubic inches are in a UK gallon?

There are 277.419 cubic inches in 1 UK gallon (1 imp gal = 277.4194327916 in³).

How do I convert cubic inches to UK gallons?

Multiply the number of cubic inches by 0.00360465. For example, 10 in³ × 0.00360465 = 0.0360465 imp gal. To convert back, multiply by 277.419.

What is 10 in³ in UK gallons?

10 in³ = 0.0360465 imp gal.

What is 100 in³ in UK gallons?

100 in³ = 0.360465 imp gal.

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units)). Results are shown to up to 10 decimal places; round them to suit your purpose.

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Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

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First published 28 October 2026 · Last reviewed 5 November 2026