Convert volume units — liters, gallons, cups, milliliters, cubic meters, barrels and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 gal | 0.000832674 gal(UK) | |
| 0.01 gal | 0.00832674 gal(UK) | |
| 0.1 gal | 0.0832674 gal(UK) | |
| 1 gal | 0.832674 gal(UK) | |
| 5 gal | 4.16337 gal(UK) | |
| 10 gal | 8.32674 gal(UK) | |
| 50 gal | 41.6337 gal(UK) | |
| 100 gal | 83.2674 gal(UK) | |
| 1000 gal | 832.674 gal(UK) |
Common us gallon values converted to uk gallon — factor: 1 gal = 0.8327 gal(UK)
| US Gallon (gal) | UK Gallon (gal(UK)) | Context |
|---|---|---|
| 0.0078 gal | 0.006495 gal(UK) | Tablespoon |
| 0.031 gal | 0.02581 gal(UK) | Quarter cup |
| 0.0625 gal | 0.05204 gal(UK) | Cup |
| 0.125 gal | 0.1041 gal(UK) | Pint |
| 0.25 gal | 0.2082 gal(UK) | Quart |
| 0.5 gal | 0.4163 gal(UK) | Half gallon |
| 1 gal | 0.8327 gal(UK) | Gallon jug |
| 2 gal | 1.665 gal(UK) | Two gallons |
| 5 gal | 4.163 gal(UK) | Jerrycan |
| 10 gal | 8.327 gal(UK) | 10-gallon drum |
| 20 gal | 16.65 gal(UK) | 20-gallon tank |
| 42 gal | 34.97 gal(UK) | Oil barrel |
| 55 gal | 45.8 gal(UK) | Drum barrel |
| 100 gal | 83.27 gal(UK) | Large drum |
| 1,000 gal | 832.7 gal(UK) | Tank |
Converting us gallon to uk gallon comes up frequently in cooking, chemistry, medicine, and engineering. A recipe written in metric units may need to be adapted for a kitchen using uk gallon, or a laboratory protocol may specify volumes in us gallon that need to be measured with equipment calibrated in uk gallon.
In everyday use, knowing that 5 gal = 4.163 gal(UK) and 10 gal = 8.327 gal(UK) covers most common situations. For bulk calculations, 100 gal = 83.27 gal(UK) is a useful anchor. The reverse conversion — uk gallon back to us gallon — uses the factor 1.201, so 1 gal(UK) = 1.201 gal.
All conversions use the internationally recognized factor of exactly 1 gal = 0.8327 gal(UK). Calculations are performed in IEEE 754 double-precision floating point, giving accuracy to at least 8 significant figures — more than sufficient for any practical application.
Formula: UK Gallon = US Gallon × 0.83267379
Multiply any us gallon value by 0.83267379 to get uk gallon. One us gallon equals 0.83267379 gal(UK).
Reverse: US Gallon = UK Gallon × 1.2009505
US gallons × 0.8327 = UK gallons. US gallon is 16.5% smaller.
A US gallon is about five-sixths of a UK gallon.
UK MPG figures look better than US MPG for the same car because the UK gallon is larger.
Prices fuel in USD per gallon and tracks daily sales volume in thousands of gallons.
Calculates pesticide and fertilizer application rates in gallons per acre.
Measures pool volume in gallons to calculate chlorine and pH chemical dosages.
Purchases engine oil, transmission fluid, and coolant in quart and gallon containers.
Estimates coverage (one US gallon covers about 350 sq ft) and quotes by the gallon.
Specifies water heater tank capacity (40, 50, 80 gallons) for residential systems.
The US liquid gallon is defined as exactly 231 cubic inches, or 3.785411784 liters. It traces its origins to the Queen Anne wine gallon of 1707, which American colonies adopted.
The US gallon differs from the UK Imperial gallon by about 16.5%. This matters for fuel economy: a US MPG figure is lower than the equivalent UK MPG for the same car.
Interesting fact: The United States, Liberia, and Myanmar are the only countries using the US gallon as a primary everyday volume unit.
The Imperial gallon was defined by the British Weights and Measures Act of 1824 as the volume of ten pounds of water at 62°F, later fixed to exactly 4.54609 liters in 1985.
UK gallons are still used in Britain for fuel pricing. Road signs show consumption in miles per Imperial gallon, making UK cars appear more fuel-efficient than identical US models.
Interesting fact: 1 Imperial gallon = 1.20095 US gallons. Confusing the two has caused real-world errors in cross-border fuel cost calculations.