US cups to imperial gallons
imperial gallons = US cups × 0.05204214
Reverse: imperial gallons to US cups
How to convert US cups to imperial gallons
One US cup is 0.05204214 imperial gallons, so multiply the number of US cups by 0.05204214. For example, 20 US cups is 20 × 0.05204214 = 1.040843 imperial gallons. To go back, divide by the same number, or multiply by 19.215199.
Quick estimate
Multiplying by about 0.05 gets within 3.9% of the exact answer, which is enough to check that a result makes sense.
Where it comes up
Volume conversions come up in recipes, fuel economy, drink and bottle sizes, garden and pool water, and engine sizes.
| US cups | imperial gallons |
|---|---|
| 1 cup | 0.05204214 impgal |
| 2 cup | 0.10408427 impgal |
| 3 cup | 0.15612641 impgal |
| 4 cup | 0.20816855 impgal |
| 5 cup | 0.26021068 impgal |
| 6 cup | 0.31225282 impgal |
| 7 cup | 0.36429496 impgal |
| 8 cup | 0.41633709 impgal |
| 9 cup | 0.46837923 impgal |
| 10 cup | 0.52042137 impgal |
| 11 cup | 0.5724635 impgal |
| 12 cup | 0.62450564 impgal |
| 13 cup | 0.67654778 impgal |
| 14 cup | 0.72858991 impgal |
| 15 cup | 0.78063205 impgal |
| 16 cup | 0.83267418 impgal |
| 17 cup | 0.88471632 impgal |
| 18 cup | 0.93675846 impgal |
| 19 cup | 0.98880059 impgal |
| 20 cup | 1.040843 impgal |
| 25 cup | 1.301053 impgal |
| 30 cup | 1.561264 impgal |
| 40 cup | 2.081685 impgal |
| 50 cup | 2.602107 impgal |
| 60 cup | 3.122528 impgal |
| 70 cup | 3.64295 impgal |
| 75 cup | 3.90316 impgal |
| 80 cup | 4.163371 impgal |
| 90 cup | 4.683792 impgal |
| 100 cup | 5.204214 impgal |
| 120 cup | 6.245056 impgal |
| 150 cup | 7.80632 impgal |
| 200 cup | 10.408427 impgal |
| 250 cup | 13.010534 impgal |
| 300 cup | 15.612641 impgal |
| 400 cup | 20.816855 impgal |
| 500 cup | 26.021068 impgal |
| 750 cup | 39.031602 impgal |
| 1,000 cup | 52.042137 impgal |
| 1,500 cup | 78.063205 impgal |
| 2,000 cup | 104.084273 impgal |
| 5,000 cup | 260.210683 impgal |
| 10,000 cup | 520.421365 impgal |
Questions
How many imperial gallons are in a US cup?
0.05204214 imperial gallons.
How do I convert US cups to imperial gallons in a spreadsheet?
Put the value in A1 and type =A1*0.05204214, then fill the formula down the column.
Are the values in the table exact?
They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.