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US Cups to UK Gallons (cup to imp gal) Converter

1 US cup (cup) = 0.0520421 UK gallons (imp gal). To convert US cups to UK gallons, multiply by 0.0520421: 2 cup × 0.0520421 = 0.104084 imp gal.

1 cup = 0.0520421365 imp gal
Convert the other way: UK Gallons to US Cups

Quick facts

How to convert US cups to UK gallons

  1. Take the value in US cups.
  2. Multiply it by 0.0520421 (the number of UK gallons in one US cup).
  3. Round the result to the precision you need.
imp gal = cup × 0.0520421

Worked example (a recipe): 2 cup × 0.0520421 = 0.104084 imp gal.

To convert UK gallons back to US cups, multiply by 19.2152, or divide by 0.0520421.

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

US Cups to UK Gallons conversion table

US Cups to UK Gallons conversion table
US Cups [cup]UK Gallons [imp gal]
0.01 cup0.0005204214 imp gal
0.1 cup0.0052042137 imp gal
1 cup0.0520421365 imp gal
2 cup0.1040842731 imp gal
3 cup0.1561264096 imp gal
5 cup0.2602106827 imp gal
10 cup0.5204213654 imp gal
20 cup1.0408427308 imp gal
50 cup2.602106827 imp gal
100 cup5.2042136539 imp gal
1000 cup52.0421365393 imp gal

cup to imp gal chart from 1 to 100

UK Gallons to US Cups conversion table

UK Gallons to US Cups conversion table
UK Gallons [imp gal]US Cups [cup]
0.01 imp gal0.1921519881 cup
0.1 imp gal1.9215198808 cup
1 imp gal19.2151988081 cup
2 imp gal38.4303976162 cup
3 imp gal57.6455964242 cup
5 imp gal96.0759940404 cup
10 imp gal192.1519880808 cup
20 imp gal384.3039761616 cup
50 imp gal960.7599404039 cup
100 imp gal1921.5198808078 cup
1000 imp gal19215.1988080777 cup

US Cups vs UK Gallons

US CupUK Gallon
Symbolcupimp gal
Equals1 cup = 0.0520421 imp gal1 imp gal = 19.2152 cup

What is a US cup?

A US customary cooking measure equal to 8 fluid ounces. The standard recipe measure for liquids and dry ingredients in the US.

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 US cup?

There are 0.0520421 UK gallons in 1 US cup (1 cup = 0.0520421365 imp gal).

How many US cups are in a UK gallon?

There are 19.2152 US cups in 1 UK gallon (1 imp gal = 19.2151988081 cup).

How do I convert US cups to UK gallons?

Multiply the number of US cups by 0.0520421. For example, 10 cup × 0.0520421 = 0.520421 imp gal. To convert back, multiply by 19.2152.

What is 10 cup in UK gallons?

10 cup = 0.520421 imp gal.

What is 100 cup in UK gallons?

100 cup = 5.20421 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