Imperial gallons to US cups Converter
Convert Imperial gallons (imp gal) to US cups (cup) instantly, or use the conversion table below to look up common values.
Imperial gallons to US cups conversion table
| Imperial gallons (imp gal) | US cups (cup) |
|---|---|
| 1 | 19.215199 |
| 2 | 38.430398 |
| 3 | 57.645596 |
| 4 | 76.860795 |
| 5 | 96.075994 |
| 10 | 192.151988 |
| 25 | 480.37997 |
| 50 | 960.75994 |
| 100 | 1,921.519881 |
How to convert Imperial gallons to US cups
1 imp gal equals 19.215199 cup. Use the converter above for any value, or read the table for common conversions.
cup = imp gal × 19.21519880807768 · imp gal = cup × 0.0520421365393118Multiply a imperial gallons figure by 19.215199 to get us cups, or divide it by 0.052042 to go the other way.
Worked examples
- 1 imp gal= 19.215199 cup
- 2 imp gal= 38.430398 cup
- 5 imp gal= 96.075994 cup
- 10 imp gal= 192.151988 cup
- 20 imp gal= 384.303976 cup
What these units are
Imperial gallons (imp gal). An imperial gallon is 4.54609 liters, about 20% more than a US gallon. It is the traditional UK and Commonwealth liquid unit, now largely replaced by liters.
US cups (cup). A US cup is 236.5882365 milliliters, or 8 US fluid ounces. It is the standard measure in American recipes; metric and Australian cups are 250 milliliters, so a recipe's cup depends on where it was written.
US and imperial units are kept separate because they are genuinely different sizes. Confirm which system a source means before trusting a converted figure.
Converting Imperial gallons to US cups in practice
Reading the result in us cups
A US cup is exactly 236.5882365 milliliters, one sixteenth of a US gallon and eight US fluid ounces. It is a recipe measure rather than a general liquid unit.
It appears in American and adapted recipe books, baking charts, measuring cup sets and some packaged food directions. Outside cooking it is rarely a legal or trade unit.
The US cup is exactly eight US fluid ounces, so cup to milliliter conversions are exact at 236.5882365. Results are rounded for display, which can shift the last digit on a return conversion.
The trap is the US legal cup of 240 milliliters used on nutrition labels, and the separate metric cup of 250 milliliters; neither matches this unit. Recipe cups are also level, not heaped.
The US cup belongs with US fluid ounces and pints, while milliliters and liters belong to the metric recipe. A metric jug marked in milliliters will not match a cup measure exactly, so a recipe converted cup by cup accumulates a small error each step.
Checking a imperial gallons to us cups conversion
The metric volume units are a clean decimal chain around the liter, so liters to milliliters is a shift of three places and cubic meters to liters is a shift of three the other way. Those pairs a reader can do without a converter.
Every pair that names a US or imperial liquid unit has to go through the definition first, because three of these units differ from a metric unit by amounts too large to round away: a liter is not a quart, a gallon is 3.785411784 liters in the US system and 4.54609 in the imperial one, and a US fluid ounce is not an imperial fluid ounce.
When checking a volume conversion, convert into liters and out again, or measure the container. The mistake that survives every other check is reading a US measure as the imperial unit of the same name, which changes a recipe, a fuel figure or a tank size by about a fifth.
Tanzania reference points
Real quantities, converted into the units on this page.
The 20-litre bucket or canister used to carry water in Tanzania
20 L = 4.399385 imp gal = 84.535057 cup
WaterAid puts the minimum daily water need per person at 20 litres, so one container is roughly one person's daily requirement.
Source: IPS News — water access in Tanzania, citing WaterAid · verified 2026-09-14
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