Litre to Gallon (US) Converter

About the Litre to Gallon (US) Converter

Litres and gallons are two of the most confusing volume units you will meet, largely because there is not one gallon but two. Americans use the US gallon while Britons use the imperial (UK) gallon, and they are different sizes — so any litre to gallon conversion needs to be careful about which one you actually want. This is exactly the kind of thing that catches people out when they are filling a car in a hire vehicle, working out how much homebrew to bottle, measuring fuel for a generator, or trying to follow a recipe that was written across the Atlantic. Let us pin down the numbers. This page converts litres to US gallons, using the factor 1 litre = 0.264172 US gallons. To convert litres to US gallons, multiply the number of litres by 0.264172. So 1 litre is 0.264 US gallons, 5 litres is 1.321 US gallons, and a standard 50-litre car fuel tank holds about 13.21 US gallons. For UK gallons the figure is different: 1 litre = 0.219969 imperial gallons, because a UK gallon is larger at 4.54609 litres compared with the US gallon's 3.78541 litres. In practice this means a UK gallon is roughly 1.2 US gallons. To reverse any of it, divide by the same factor — so a US gallon is 3.78541 litres and a UK gallon is 4.54609 litres. Where does this matter in real life? Fuel is the headline. Petrol and diesel are sold by the litre in the UK, but car owners in North America think in gallons, and comparing prices across countries is impossible without converting. Cooking and brewing are close behind: many American recipes and larger brewing volumes are measured in gallons, while UK homebrewers and commercial kits use litres. Aquarium keepers, gardeners mixing plant feed, and anyone filling a water butt or sprayer all bounce between the two units. Knowing that a gallon is somewhere between 3.8 and 4.5 litres depending on which system you mean prevents a genuinely soggy or badly mixed batch. The single biggest mistake people make is using the wrong gallon. The imperial gallon, based on the volume of 10 pounds of water at a fixed temperature, is about 20% larger than its US cousin, so treating them as interchangeable can throw a recipe or a fuel budget off significantly. It is always worth confirming whether you need US or UK gallons before you convert. A couple of everyday anchors help too: a standard bathtub holds around 150 litres, which is about 40 US gallons, while a 1-litre bottle of water is a shade over a quarter of a US gallon. When comparing fuel economy, British figures are given in miles per gallon using imperial gallons, whereas American figures use US gallons, so the same car can look dramatically different in economy on paper. This free tool handles US gallons precisely both ways, and the FAQs below cover the imperial conversion too, so you can be confident your volumes are correct whichever side of the pond you are on.