US Cups to Imperial Gallons Converter
Convert US cups to Imperial gallons instantly with this free US cups to Imperial gallons converter. Enter any value to get an accurate volume conversion, plus the formula, the conversion factor and a full reference table.
What is 1 US cup in Imperial gallons?
1 US cup is equal to 0.052042137 Imperial gallons.
1 ÷ 19.2151988 = 0.052042137 Imperial gallons
1 US cup = 0.0520421365 Imperial gallons
US cups to Imperial gallons formula
imp gal = cup ÷ 19.2151988
The US cups to Imperial gallons conversion factor is 0.052042136539, which is exact by definition. 1 US cup = 0.052042136539 Imperial gallons, and 1 Imperial gallon = 19.2151988081 US cups.
Regional note. Gallons differ by region. A US liquid gallon is exactly 3.785411784 liters; an Imperial (UK) gallon is exactly 4.54609 liters — about 20% larger. This page uses the Imperial gallon.
Worked examples
- 2 US cups = 0.104084273 Imperial gallons — 2 ÷ 19.2151988 = 0.104084273 Imperial gallons
- 6 US cups = 0.312252819 Imperial gallons — 6 ÷ 19.2151988 = 0.312252819 Imperial gallons
- 10 US cups = 0.520421365 Imperial gallons — 10 ÷ 19.2151988 = 0.520421365 Imperial gallons
US cups to Imperial gallons conversion table
Every value below is calculated with the exact conversion factor and rounded for display.
| US cups (cup) | Imperial gallons (imp gal) |
|---|---|
| 1 cup | 0.05204214 imp gal |
| 2 cup | 0.10408427 imp gal |
| 3 cup | 0.15612641 imp gal |
| 4 cup | 0.20816855 imp gal |
| 5 cup | 0.26021068 imp gal |
| 6 cup | 0.31225282 imp gal |
| 7 cup | 0.36429496 imp gal |
| 8 cup | 0.41633709 imp gal |
| 9 cup | 0.46837923 imp gal |
| 10 cup | 0.52042137 imp gal |
| 12 cup | 0.62450564 imp gal |
| 15 cup | 0.78063205 imp gal |
| 20 cup | 1.0408427 imp gal |
| 25 cup | 1.3010534 imp gal |
| 30 cup | 1.5612641 imp gal |
| 50 cup | 2.6021068 imp gal |
| 75 cup | 3.9031602 imp gal |
| 100 cup | 5.2042137 imp gal |
| 500 cup | 26.021068 imp gal |
| 1,000 cup | 52.042137 imp gal |
When you need to convert US cups to Imperial gallons
- Scaling recipes between metric millilitres and US cups, pints or fluid ounces.
- Comparing fuel prices and tank capacities between countries.
- Working out paint, fertiliser or pool chemical quantities from instructions written for another market.
Getting a feel for the scale
A converted number is easier to trust when you can picture it. These reference points let you sanity-check the result at a glance.
Imperial gallon (imp gal)
- An Imperial gallon is about 1.2 US gallons
- UK fuel prices are quoted per litre, not per gallon
Common mistakes to avoid
- Dividing when you should multiply. Because 1 US cup = 0.052042 Imperial gallons, the answer should be smaller than the number you started with.
- Mixing US and Imperial liquid measures. The Imperial gallon and pint are about 20% larger than their US counterparts, which is enough to ruin a recipe or misstate fuel economy.
- Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.
How precise does the answer need to be?
Cooking tolerates rounding to the nearest 5 mL or quarter cup. Dosing, chemistry and pool treatment do not — keep the full converted value there.
How these units are defined
- US cup (cup): 8 US fluid ounces, about 236.6 mL. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
- Imperial gallon (imp gal): Exactly 4.54609 liters — the gallon used in the UK and historically in Canada. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
Related conversions
Frequently asked questions
- What is 1 US cup in Imperial gallons?
- 1 US cup is equal to 0.052042137 Imperial gallons.
- How many US cups are in one Imperial gallon?
- There are 19.2151988 US cups in 1 Imperial gallon.
- How do you convert US cups to Imperial gallons?
- Multiply the number of US cups by 0.052042137 — or use the formula imp gal = cup ÷ 19.2151988.
- What is 6 US cups in Imperial gallons?
- 6 US cups is 0.312252819 Imperial gallons. 6 ÷ 19.2151988 = 0.312252819 Imperial gallons.
- Is the US cups to Imperial gallons conversion exact?
- Yes. The relationship is fixed by definition, so 0.052042136539 is an exact conversion factor — only the displayed result is rounded.
- Does this use US or Imperial Imperial gallons?
- Gallons differ by region. A US liquid gallon is exactly 3.785411784 liters; an Imperial (UK) gallon is exactly 4.54609 liters — about 20% larger. This page uses the Imperial gallon.