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.
Quick facts
- 1 cup = 0.0520421 imp gal
- 1 imp gal = 19.2152 cup
- Formula: imp gal = cup × 0.0520421
- Quick estimate: multiply by about 0.052
How to convert US cups to UK gallons
- Start with your measurement in US cups.
- Multiply it by 0.0520421 (the number of UK gallons in one US cup).
- Round the answer to a sensible number of decimal places.
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 [cup] | UK Gallons [imp gal] |
|---|---|
| 0.01 cup | 0.0005204214 imp gal |
| 0.1 cup | 0.0052042137 imp gal |
| 1 cup | 0.0520421365 imp gal |
| 2 cup | 0.1040842731 imp gal |
| 3 cup | 0.1561264096 imp gal |
| 5 cup | 0.2602106827 imp gal |
| 10 cup | 0.5204213654 imp gal |
| 20 cup | 1.0408427308 imp gal |
| 50 cup | 2.602106827 imp gal |
| 100 cup | 5.2042136539 imp gal |
| 1000 cup | 52.0421365393 imp gal |
cup to imp gal chart from 1 to 100
- 1 cup 0.0520421 imp gal
- 2 cup 0.104084 imp gal
- 3 cup 0.156126 imp gal
- 4 cup 0.208169 imp gal
- 5 cup 0.260211 imp gal
- 6 cup 0.312253 imp gal
- 7 cup 0.364295 imp gal
- 8 cup 0.416337 imp gal
- 9 cup 0.468379 imp gal
- 10 cup 0.520421 imp gal
- 11 cup 0.572464 imp gal
- 12 cup 0.624506 imp gal
- 13 cup 0.676548 imp gal
- 14 cup 0.72859 imp gal
- 15 cup 0.780632 imp gal
- 16 cup 0.832674 imp gal
- 17 cup 0.884716 imp gal
- 18 cup 0.936758 imp gal
- 19 cup 0.988801 imp gal
- 20 cup 1.04084 imp gal
- 25 cup 1.30105 imp gal
- 30 cup 1.56126 imp gal
- 35 cup 1.82147 imp gal
- 40 cup 2.08169 imp gal
- 45 cup 2.3419 imp gal
- 50 cup 2.60211 imp gal
- 55 cup 2.86232 imp gal
- 60 cup 3.12253 imp gal
- 65 cup 3.38274 imp gal
- 70 cup 3.64295 imp gal
- 75 cup 3.90316 imp gal
- 80 cup 4.16337 imp gal
- 85 cup 4.42358 imp gal
- 90 cup 4.68379 imp gal
- 95 cup 4.944 imp gal
- 100 cup 5.20421 imp gal
UK Gallons to US Cups conversion table
| UK Gallons [imp gal] | US Cups [cup] |
|---|---|
| 0.01 imp gal | 0.1921519881 cup |
| 0.1 imp gal | 1.9215198808 cup |
| 1 imp gal | 19.2151988081 cup |
| 2 imp gal | 38.4303976162 cup |
| 3 imp gal | 57.6455964242 cup |
| 5 imp gal | 96.0759940404 cup |
| 10 imp gal | 192.1519880808 cup |
| 20 imp gal | 384.3039761616 cup |
| 50 imp gal | 960.7599404039 cup |
| 100 imp gal | 1921.5198808078 cup |
| 1000 imp gal | 19215.1988080777 cup |
US Cups vs UK Gallons
| US Cup | UK Gallon | |
|---|---|---|
| Symbol | cup | imp gal |
| Equals | 1 cup = 0.0520421 imp gal | 1 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.
Where You Will Meet US Cups and UK Gallons
US cups are used mainly in the United States, while UK gallons are used mainly in the UK (pub pints, fuel economy in mpg) and older Canadian recipes. This conversion bridges the US customary and metric systems, so it comes up whenever a figure crosses the US border with Canada or the Atlantic with the UK: product specifications, travel, recipes, school work and trade.
How big is 1 cup compared with 1 imp gal?
1 cup is only 0.0520421 of 1 imp gal: you need 19.2152 US cups to make 1 imp gal, so the number gets smaller when you convert.
US Cups to UK Gallons without a calculator
- In your head: multiply by 0.05 (about 3.9% off). 2 cup × 0.05 ≈ 0.1 imp gal.
- Closer estimate: multiply by 0.052 (within 0.081%).
- Or divide: divide by 19 (within 1.1%), which is often easier than multiplying by a small decimal.
Real-world cup to imp gal examples
| Example | US Cups | UK Gallons |
|---|---|---|
| A cup of milk | 1 cup | 0.0520421 imp gal |
| A recipe | 2 cup | 0.104084 imp gal |
| A quarter cup | 0.25 cup | 0.0130105 imp gal |
| Three-quarters of a cup | 0.75 cup | 0.0390316 imp gal |
| One imperial gallon | 19.2152 cup | 1 imp gal |
| A small aquarium | 192.152 cup | 10 imp gal |
| A garden water butt | 864.684 cup | 45 imp gal |
How exact is the cup to imp gal factor?
The factor is exact by definition, so any error comes only from rounding. Round the final answer, not the factor, and match the precision of the number you started with.
Mistakes to avoid
- US and imperial (UK) measures share names but not sizes. Check which one a recipe, label or fuel figure uses before converting.
- Metric cups in Canada and Australia hold 250 ml, and US nutrition labels round the cup to 240 ml; the US customary cup here is 236.6 ml.
Background on US cups and UK gallons
The US customary cup is 236.6 ml, but US nutrition labels use a rounded 240 ml cup.
The imperial gallon was introduced in 1824 and is defined as exactly 4.54609 litres.
Related conversions
Related conversions you may need next: us cups to us gallons, uk gallons to liters, uk gallons to us gallons and us cups to milliliters. The full volume converter lists every unit.
On pakmath.com, the percentage calculator is a useful next step; Adzita offers a free fuel cost calculator.
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 by 0.0520421, or divide by 19.2152 if that is easier. Example: 10 cup = 0.520421 imp gal.
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.
What is an easy way to convert US cups to UK gallons?
In your head: multiply by 0.05 (about 3.9% off). 2 cup × 0.05 ≈ 0.1 imp gal.
How many UK gallons is 0.75 cup (three-quarters of a cup)?
0.75 cup = 0.0390316 imp gal.
How many US cups is one imperial gallon (1 imp gal)?
1 imp gal = 19.2152 cup.
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