Liters to Gallons Converter

No, and the difference is big. 1 US gallon equals exactly 3.785411784 liters, while 1 UK imperial gallon equals exactly 4.54609 liters. The UK gallon is about 20 percent larger. The US fluid ounce (approximately 29.5735 mL) and UK fluid ounce (approximately 28.4131 mL) also differ, so a 16 US fluid ounce pint and a 20 UK fluid ounce pint are not the same volume. Always check which system a source uses before converting.

The US fixed its gallon in 1893 via the Mendenhall Order, which anchored US customary units to the metric system. The US gallon was set at 231 cubic inches (a value inherited from the 1707 British wine gallon), giving exactly 3.785411784 liters. The UK replaced its older Imperial gallon (defined in 1824 as the volume of 10 lb of water) with a clean metric value in the Weights and Measures Act 1985: exactly 4.54609 liters. The split happened because the US never adopted the 1824 Imperial reform and stuck with the older wine gallon, while the UK upgraded then later cleaned the number up to a metric anchor.

Because the UK gallon is 20 percent bigger. A UK fuel price quoted per gallon is for a larger volume than a US gallon at the same pump. If UK fuel costs 6.00 GBP per Imperial gallon, that is 6.00 / 4.54609 = 1.32 GBP per liter, which translates to roughly 5.00 GBP per US gallon at the same price. The UK actually stopped selling fuel by the gallon in 1995 and switched to liters, so any modern UK gallon price you see is just a unit converted from the per-liter pump price. Comparing US-gal to UK-gal headlines without converting will always make UK prices look better than they are.

Multiply liters by 0.264 (or divide by 3.785). For a quick mental shortcut: 1 liter is about a quarter of a US gallon, so divide liters by 4 for a rough estimate. A 60 L tank is roughly 60 / 4 = 15 US gallons (the exact value is 15.85 US gal). Going the other way: multiply US gallons by 4 minus 5 percent. 10 US gallons is about 40 minus 2 = 38 liters (exact is 37.85 L). For UK Imperial gallons, multiply liters by 0.22 or divide by 4.55.

Most US passenger cars carry 12 to 16 US gallons, which is roughly 45 to 60 liters. Compact cars sit at the lower end (40 to 50 L), midsize sedans and small SUVs land around 50 to 65 L, and full-size pickups and SUVs run 70 to 100 L (up to 26 US gal). European and Asian cars are usually specced in liters directly. Electric vehicles are quoted in kWh of battery instead of liters, but a useful mental anchor is that 1 US gallon of gasoline holds about 33.7 kWh of energy.