US Cups to Imperial Gallons Converter
1 US cup ≈ 0.0520421365 imperial gallons
US recipes may also use the "legal" cup of exactly 240 mL used on nutrition labels.
1 US cup equals 0.0520421 imperial gallons
How to convert US cups to imperial gallons
Choose the named US, Imperial or metric unit before converting a recipe or container size. A US liquid gallon is 3.785411784 L; an Imperial gallon is 4.54609 L. Volume alone cannot give ingredient mass without density.
imp gal = cup × 0.05204213654One US cup is 0.05204213654 imperial gallons, so a single multiplication converts any value.
0.520421 imp gal ≈ 10 × 0.05204213654US recipes may also use the "legal" cup of exactly 240 mL used on nutrition labels.
US cups to imperial gallons conversion table
Common values in US cups, converted to imperial gallons.
| US cups (cup) | Imperial gallons (imp gal) |
|---|---|
| 1 | 0.052042137 |
| 2 | 0.10408427 |
| 3 | 0.15612641 |
| 4 | 0.20816855 |
| 5 | 0.26021068 |
| 10 | 0.52042137 |
| 20 | 1.0408427 |
| 25 | 1.3010534 |
| 50 | 2.6021068 |
| 100 | 5.2042137 |
| 250 | 13.010534 |
| 500 | 26.021068 |
| 1,000 | 52.042137 |
About these units
US cupcup
The US customary cup: 8 US fluid ounces, about 236.6 mL.
imperial gallonimp gal
The UK gallon: exactly 4.54609 litres.
Reference: UK Weights and Measures Act 1985.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.