UK Gallons to US Cups (imp gal to cup) Converter
1 UK gallon (imp gal) = 19.2152 US cups (cup). To convert UK gallons to US cups, multiply by 19.2152: 25 imp gal × 19.2152 = 480.38 cup.
Quick facts
- 1 imp gal = 19.2152 cup
- 1 cup = 0.0520421 imp gal
- Formula: cup = imp gal × 19.2152
- Quick estimate: multiply by about 19
How to convert UK gallons to US cups
- Take the value in UK gallons.
- Multiply it by 19.2152 (the number of US cups in one UK gallon).
- Check the answer: it should be larger than the number you started with.
Worked example: 25 imp gal × 19.2152 = 480.38 cup.
To convert US cups back to UK gallons, multiply by 0.0520421, or divide by 19.2152.
Source: NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units).
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 |
imp gal to cup chart from 1 to 100
- 1 imp gal 19.2152 cup
- 2 imp gal 38.4304 cup
- 3 imp gal 57.6456 cup
- 4 imp gal 76.8608 cup
- 5 imp gal 96.076 cup
- 6 imp gal 115.291 cup
- 7 imp gal 134.506 cup
- 8 imp gal 153.722 cup
- 9 imp gal 172.937 cup
- 10 imp gal 192.152 cup
- 11 imp gal 211.367 cup
- 12 imp gal 230.582 cup
- 13 imp gal 249.798 cup
- 14 imp gal 269.013 cup
- 15 imp gal 288.228 cup
- 16 imp gal 307.443 cup
- 17 imp gal 326.658 cup
- 18 imp gal 345.874 cup
- 19 imp gal 365.089 cup
- 20 imp gal 384.304 cup
- 25 imp gal 480.38 cup
- 30 imp gal 576.456 cup
- 35 imp gal 672.532 cup
- 40 imp gal 768.608 cup
- 45 imp gal 864.684 cup
- 50 imp gal 960.76 cup
- 55 imp gal 1056.84 cup
- 60 imp gal 1152.91 cup
- 65 imp gal 1248.99 cup
- 70 imp gal 1345.06 cup
- 75 imp gal 1441.14 cup
- 80 imp gal 1537.22 cup
- 85 imp gal 1633.29 cup
- 90 imp gal 1729.37 cup
- 95 imp gal 1825.44 cup
- 100 imp gal 1921.52 cup
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 |
UK Gallons vs US Cups
| UK Gallon | US Cup | |
|---|---|---|
| Symbol | imp gal | cup |
| Equals | 1 imp gal = 19.2152 cup | 1 cup = 0.0520421 imp gal |
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.
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.
Where You Will Meet UK Gallons and US Cups
UK gallons are used mainly in the UK (pub pints, fuel economy in mpg) and older Canadian recipes, while US cups are used mainly in the United States. Canada and the UK use a mix of metric and imperial units while the US uses customary units, so students, engineers, travellers and shoppers in all three countries switch between them often.
How big is 1 imp gal compared with 1 cup?
1 imp gal is 19.2152 times the size of 1 cup, so the number gets bigger when you convert UK gallons to US cups.
UK Gallons to US Cups without a calculator
- In your head: multiply by 20 (about 4.1% off). 10 imp gal × 20 ≈ 200 cup.
- Closer estimate: multiply by 19 (within 1.1%).
Real-world imp gal to cup examples
| Example | UK Gallons | US Cups |
|---|---|---|
| One imperial gallon | 1 imp gal | 19.2152 cup |
| A small aquarium | 10 imp gal | 192.152 cup |
| A garden water butt | 45 imp gal | 864.684 cup |
| A cup of milk | 0.0520421 imp gal | 1 cup |
| A recipe | 0.104084 imp gal | 2 cup |
| A quarter cup | 0.0130105 imp gal | 0.25 cup |
How exact is the imp gal to cup factor?
The factor is exact by definition, so any error comes only from rounding. Keep at least 4 significant figures for school work, and the full factor for anything legal or commercial.
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 UK gallons and US cups
The imperial gallon was introduced in 1824 and is defined as exactly 4.54609 litres.
The US customary cup is 236.6 ml, but US nutrition labels use a rounded 240 ml cup.
Related conversions
People who convert uk gallons to us cups often need us gallons to us cups, us cups to milliliters, uk gallons to liters and uk gallons to us gallons. The full volume converter lists every unit.
On pakmath.com, the scientific calculator is a useful next step, as is the percentage calculator; for related everyday maths, try the fuel cost calculator on Adzita.
Frequently asked questions
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 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 do I convert UK gallons to US cups?
Multiply the number of UK gallons by 19.2152. For example, 10 imp gal × 19.2152 = 192.152 cup. To convert back, multiply by 0.0520421.
What is 10 imp gal in US cups?
10 imp gal = 192.152 cup.
What is 100 imp gal in US cups?
100 imp gal = 1,921.52 cup.
Is the imp gal to cup 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 UK gallons to US cups?
In your head: multiply by 20 (about 4.1% off). 10 imp gal × 20 ≈ 200 cup.
How many US cups is 45 imp gal (a garden water butt)?
45 imp gal = 864.684 cup.
How many UK gallons is a quarter cup (0.25 cup)?
0.25 cup = 0.0130105 imp gal.
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