Gallon (US) to Gallon (UK) Converter
Volume · unit-converter
Convert Gallon (US) to Gallon (UK) with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use liter-based factors (US fluid measures, imperial UK units, SI cubic meters).
Calculator
From: Gallon (US) (gal)
To: Gallon (UK) (ukgal)
About Gallon (US)
The US liquid gallon is defined as 231 cubic inches (about 3.78541 liters). US recipes, fuel economy, and retail liquids typically use US gallons.
About Gallon (UK)
The UK imperial gallon is defined as approximately 4.54609 liters. It is larger than the US liquid gallon and is used for fuel and drinks labeling in the UK.
How to convert gallons (us) to gallons (uk)
1 gallon (us) is equal to 0.83267418374911 gallon (uk):
1 gal = (3.78541178 L ÷ 4.54609 L) ukgal = 0.83267418374911 ukgal
Each gallon (us) is defined as 3.78541178 L and each gallon (uk) as 4.54609 L, so one gal equals 3.78541178 ÷ 4.54609 ukgal = 0.83267418374911 ukgal.
Let V(gal) be the numeric value of the same volume measured in Gallon (US) (gal), and V(ukgal) the value in Gallon (UK) (ukgal). Then:
V(ukgal) = V(gal) × (3.78541178 / 4.54609)
Equivalently, divide by how many gal fit into one ukgal (liters per ukgal divided by liters per gal):
V(ukgal) = V(gal) ÷ 1.20094992677388
Or: gallon (uk) = gallon (us) ÷ 1.20094992677388
Examples
Example #1: Convert 20 gal to gallon (uk)
20 gal = 20 gal × (3.78541178/4.54609) ukgal = 16.653483675 ukgal
20 gal = 20 gal ÷ 1.20094992677388 = 16.653483675 ukgal
Example #2: Convert 50 gal to gallon (uk)
50 gal = 50 gal × (3.78541178/4.54609) ukgal = 41.6337091875 ukgal
50 gal = 50 gal ÷ 1.20094992677388 = 41.6337091875 ukgal
Summary
To convert Gallon (US) to Gallon (UK), multiply the value in gal by the ratio of liters per gal divided by liters per ukgal. Equivalently: value_ukgal = value_gal × (3.78541178 / 4.54609). Numerically, 1 gal equals 0.8326741837491118 ukgal.
Relationship context
You are converting between US customary fluid / volume (Gallons (US)) and UK imperial fluid / volume (Gallons (UK)). US and UK fluid measures differ (gallons, ounces, tablespoons); metric liters and cubic meters align with SI. The numeric factor used here is 8.326742e-1.
Conversion tables
| Gallon (US) (gal) | Gallon (UK) (ukgal) |
|---|---|
| 0.1 | 0.0832674184 |
| 1 | 0.8326741837 |
| 2 | 1.6653483675 |
| 3 | 2.4980225513 |
| 4 | 3.330696735 |
| 5 | 4.1633709188 |
| 6 | 4.9960451025 |
| 7 | 5.8287192862 |
| 8 | 6.66139347 |
| 9 | 7.4940676537 |
| Gallon (US) (gal) | Gallon (UK) (ukgal) |
|---|---|
| 10 | 8.3267418375 |
| 20 | 16.653483675 |
| 30 | 24.9802255125 |
| 40 | 33.30696735 |
| 50 | 41.6337091875 |
| 60 | 49.9604510249 |
| 70 | 58.2871928624 |
| 80 | 66.6139346999 |
| 90 | 74.9406765374 |
| 100 | 83.2674183749 |