Convert volume units — liters, gallons, cups, milliliters, cubic meters, pints, quarts.
| Unit | Name | Value |
|---|---|---|
| L | Liter | 4.54609 |
| mL | Milliliter | 4546.09 |
| m³ | Cubic Meter | 0.00454609 |
| gal(US) | US Gallon | 1.2009505 |
| qt | US Quart | 4.8037994 |
| pt | US Pint | 9.607609 |
| cup | US Cup | 19.215218 |
| fl oz | Fluid Ounce | 153.72174 |
Common uk gallon values converted to us gallon — factor: 1 gal(UK) = 1.201 gal
| UK Gallon (gal(UK)) | US Gallon (gal) | Context |
|---|---|---|
| 0.0065 gal(UK) | 0.007806 gal | Tablespoon |
| 0.025 gal(UK) | 0.03002 gal | Quarter cup |
| 0.05 gal(UK) | 0.06005 gal | Cup |
| 0.125 gal(UK) | 0.1501 gal | UK pint |
| 0.25 gal(UK) | 0.3002 gal | UK quart |
| 0.5 gal(UK) | 0.6005 gal | Half UK gallon |
| 1 gal(UK) | 1.201 gal | UK gallon |
| 2 gal(UK) | 2.402 gal | Two UK gallons |
| 5 gal(UK) | 6.005 gal | Jerrycan |
| 10 gal(UK) | 12.01 gal | 10-gallon drum |
| 20 gal(UK) | 24.02 gal | 20-gallon tank |
| 35 gal(UK) | 42.03 gal | UK oil barrel |
| 55 gal(UK) | 66.05 gal | Drum barrel |
| 100 gal(UK) | 120.1 gal | Large drum |
| 1,000 gal(UK) | 1,201 gal | Tank |
Converting uk gallon to us 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 us gallon, or a laboratory protocol may specify volumes in uk gallon that need to be measured with equipment calibrated in us gallon.
In everyday use, knowing that 5 gal(UK) = 6.005 gal and 10 gal(UK) = 12.01 gal covers most common situations. For bulk calculations, 100 gal(UK) = 120.1 gal is a useful anchor. The reverse conversion — us gallon back to uk gallon — uses the factor 0.8327, so 1 gal = 0.8327 gal(UK).
All conversions use the internationally recognized factor of exactly 1 gal(UK) = 1.201 gal. 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: US Gallon = UK Gallon × 1.2009505
Multiply any uk gallon value by 1.2009505 to get us gallon. One uk gallon equals 1.2009505 gal.
Reverse: UK Gallon = US Gallon × 0.83267379
UK gallons × 1.201 = US gallons. UK gallon is 20% larger.
One UK gallon holds about 1.2 US gallons — easy to remember.
1 UK MPG = 0.8327 US MPG — don't compare them directly.
Calculates fuel economy in miles per Imperial gallon, the standard UK efficiency metric.
Orders bulk beer kegs rated in Imperial gallons and reconciles against pint servings.
Applies pesticides at rates specified in Imperial gallons per acre in legacy manuals.
Calculates boat fuel range using Imperial gallons for UK coastal navigation.
Converts UK heating oil deliveries between Imperial gallons and liters for EU reports.
References older British Pharmacopoeia formulations using Imperial gallon quantities.
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.
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.