UK Gallons to Gallons Converter
Convert UK gallons to US gallons instantly. One UK gallon equals exactly 1.20095 US gallons. Type in either box to convert both ways, then use the chart, worked examples and everyday sizes below.
How to convert UK gallons to US gallons
Worked example: convert 250 UK gallons to US gallons. Using US gallons ← UK gallons × 1.200949926, we get 250 × 1.200949926 = 300.23748 gal. To check the result, convert back: 300.23748 gal ÷ 1.200949926 = 250 imp gal.
Uk gallons to US gallons chart
| Uk gallons (imp gal) | Us gallons (gal) |
|---|---|
| 1 imp gal | 1.20095 gal |
| 2 imp gal | 2.4019 gal |
| 3 imp gal | 3.60285 gal |
| 4 imp gal | 4.8038 gal |
| 5 imp gal | 6.00475 gal |
| 6 imp gal | 7.2057 gal |
| 8 imp gal | 9.607599 gal |
| 10 imp gal | 12.0095 gal |
| 12 imp gal | 14.4114 gal |
| 15 imp gal | 18.01425 gal |
| 20 imp gal | 24.019 gal |
| 25 imp gal | 30.02375 gal |
| 30 imp gal | 36.0285 gal |
| 40 imp gal | 48.038 gal |
| 50 imp gal | 60.0475 gal |
| 75 imp gal | 90.07124 gal |
| 100 imp gal | 120.095 gal |
| 150 imp gal | 180.1425 gal |
| 200 imp gal | 240.19 gal |
| 250 imp gal | 300.2375 gal |
| 500 imp gal | 600.475 gal |
| 1,000 imp gal | 1,200.95 gal |
Us gallons to UK gallons (reverse)
| Us gallons (gal) | Uk gallons (imp gal) |
|---|---|
| 1 gal | 0.8326742 imp gal |
| 2 gal | 1.665348 imp gal |
| 5 gal | 4.163371 imp gal |
| 10 gal | 8.326742 imp gal |
| 20 gal | 16.65348 imp gal |
| 50 gal | 41.63371 imp gal |
| 100 gal | 83.26742 imp gal |
| 250 gal | 208.1685 imp gal |
| 500 gal | 416.3371 imp gal |
| 1,000 gal | 832.6742 imp gal |
About the UK gallon and the US gallon
The imperial gallon was used across the British Empire and still sits behind UK fuel economy figures in miles per gallon, even though fuel is sold by the liter.
The US liquid gallon divides into 4 quarts, 8 pints or 16 cups. It is the unit on US fuel pumps and for milk jugs; the UK imperial gallon is about 20% larger.
One UK gallon equals 1.20095 US gallons, which makes the UK gallon the larger unit of the two.
Everyday sizes in UK gallons and US gallons
| Everyday example (approximate) | In UK gallons | In US gallons |
|---|---|---|
| A large water bottle | 0.21997 imp gal | 0.26417 gal |
| A 2-liter soft drink bottle | 0.43994 imp gal | 0.52834 gal |
| A bucket | 2.1997 imp gal | 2.6417 gal |
| A car fuel tank | 10.998 imp gal | 13.209 gal |
| A bathtub filled for a bath | 32.995 imp gal | 39.626 gal |
| A hot-water cylinder | 43.994 imp gal | 52.834 gal |
Uk gallons to US gallons FAQ
How many US gallons are in one UK gallon?
One UK gallon equals exactly 1.200949926 US gallons. In the other direction, one US gallon equals 0.83267418 UK gallons.
How do I convert UK gallons to US gallons without a calculator?
convert 250 UK gallons to US gallons. Using US gallons ← UK gallons × 1.200949926, we get 250 × 1.200949926 = 300.23748 gal. To check the result, convert back: 300.23748 gal ÷ 1.200949926 = 250 imp gal. For a quick estimate, round the factor to 1.2. Then 250 imp gal is about 300 gal, compared with the exact 300.237 gal (an error of 0.079%). That is close enough for planning, but use the calculator above when the number matters.
What is a bathtub filled for a bath in US gallons?
A bathtub filled for a bath is about 32.995 UK gallons, which is 39.626 US gallons. Treat that as an approximate everyday figure rather than an official measurement.
Are the UK gallons and US gallons the same in every country?
The imperial gallon is exactly 4.54609 L; the US gallon is smaller at 3.785 L. The US gallon is exactly 3.785411784 L and the UK imperial gallon is 4.54609 L.