Convert Imperial gallons to US cups
1 imperial gallon is 19.22 cup. One imperial gallon is exactly 19.2151988081 US cups.
One imperial gallon is 19.215199 US cups. To convert imperial gallons to US cups, multiply by 19.215199; to go the other way, divide by 19.215199 or multiply by 0.052042137. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 130.
Factor checked against the defining standard · How we check
- Imperial gallons × 19.215199
1 * 19.21519919.215 cup
1 imperial gallon in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons | 922.3295428 tsp | × 922.329542788 |
| US tablespoons | 307.4431809 tbsp | × 307.443180929 |
| US fluid ounces | 153.7215905 fl oz | × 153.721590465 |
| US cups | 19.21519881 cup | × 19.2151988081 |
| US pints | 9.607599404 pt | × 9.60759940404 |
| US quarts | 4.803799702 qt | × 4.80379970202 |
| US gallons | 1.200949926 gal | × 1.2009499255 |
| milliliters | 4,546.09 ml | × 4,546.09 |
| liters | 4.54609 L | × 4.54609 |
| imperial gallons (as entered) | 1 gal (UK) | — |
| imperial quarts | 4 qt (UK) | × 4 |
| imperial pints | 8 pt (UK) | × 8 |
| imperial fluid ounces | 160 fl oz (UK) | × 160 |
| imperial gills | 32 gi (UK) | × 32 |
| cubic millimetres | 4,546,090 mm³ | × 4,546,090 |
| cubic centimetres | 4,546.09 cm³ | × 4,546.09 |
| cubic inches | 277.4194328 in³ | × 277.419432792 |
| cubic feet | 0.1605436532 ft³ | × 0.160543653236 |
| cubic yards | 0.005946061231 yd³ | × 0.00594606123096 |
| cubic metres | 0.00454609 m³ | × 0.00454609 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert imperial gallons to US cups? The converter and the working
- 1.Take the measurement in imperial gallons.
- 2.Multiply by 19.215199 — that is how many US cups fit in one imperial gallon.
- 3.To go back the other way, divide by 19.215199, or multiply by 0.052042137.
Worked example: 25 imperial gallons to US cups
- Formula
- gal (UK) × 19.215199 = cup
- Arithmetic
- 25 × 19.215199 = 480.38 cup
- Answer
- 25 gal (UK) = 480.38 cup
The factor is rounded for display; the figure above is computed from the full value.
Imperial gallons to US cups conversion table
| Imperial gallons | US cups |
|---|---|
| 1 gal (UK) | 19.22 cup |
| 2 gal (UK) | 38.43 cup |
| 3 gal (UK) | 57.65 cup |
| 4 gal (UK) | 76.86 cup |
| 5 gal (UK) | 96.08 cup |
| 6 gal (UK) | 115.29 cup |
| 7 gal (UK) | 134.51 cup |
| 8 gal (UK) | 153.72 cup |
| 9 gal (UK) | 172.94 cup |
| 10 gal (UK) | 192.15 cup |
| 12 gal (UK) | 230.58 cup |
| 15 gal (UK) | 288.23 cup |
| 20 gal (UK) | 384.3 cup |
| 25 gal (UK) | 480.38 cup |
| 50 gal (UK) | 960.76 cup |
| 100 gal (UK) | 1,921.52 cup |
| 200 gal (UK) | 3,843.04 cup |
| 300 gal (UK) | 5,764.56 cup |
| 500 gal (UK) | 9,607.6 cup |
| 1000 gal (UK) | 19,215.2 cup |
| 2000 gal (UK) | 38,430.4 cup |
| 5000 gal (UK) | 96,075.99 cup |
| 10000 gal (UK) | 192,151.99 cup |
What is an imperial gallon?
Exactly 4.54609 liters since 1985, and the reason UK and US fuel economy figures cannot be compared: it is 20% larger than the US gallon, so 40 mpg in Britain is about 33 mpg in America on the same car.
What is a US cup?
Eight US fluid ounces, about 236.6 ml. The "legal" cup on nutrition labels is a rounded 240 ml.
How many US cups are in an imperial gallon?
One imperial gallon is 19.215199 US cups. Going the other way, one US cup is 0.052042137 imperial gallons. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to an imperial gallon.
Cite this page
- APA
- Rule Calculator. (2026). Convert Imperial gallons to US cups. Rule Calculator. https://rulecalculators.com/convert/imperial-gallon-to-cup
- MLA
- "Convert Imperial gallons to US cups." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/imperial-gallon-to-cup.
- Chicago
- Rule Calculator. "Convert Imperial gallons to US cups." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/imperial-gallon-to-cup.
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Questions people actually ask
- How many US cups are in an imperial gallon?
- 19.215199. Eight US fluid ounces, about 236.6 ml. The "legal" cup on nutrition labels is a rounded 240 ml.
- How do I convert US cups back to imperial gallons?
- Divide by 19.215199, or multiply by 0.052042137 — they are the same operation.
Other volume conversions
US cups to imperial gallons — the same conversion the other way.