Gallons to Liters: Gas, Cooking and Travel for Americans

Published on June 12, 2026 · 10 min read

You pull into a Canadian gas station and the pump shows liters — but your tank says it holds 16 gallons. You are following a British recipe that calls for 2 liters of stock but your measuring pitcher only shows cups and quarts. You are buying bottled water in Europe and trying to figure out if a 1.5-liter bottle is enough for the day. For Americans, gallons are instinctive — and liters take a moment. This guide makes the conversion second nature.

The Exact Formula

There are two types of gallons in the world — and they are not the same:

The imperial gallon is about 20% larger than the US gallon. This matters enormously at Canadian gas stations — see below. For quick mental math: 1 US gallon ≈ 3.785 liters, and 1 liter ≈ 0.264 US gallons.

Mental Math Shortcuts

Complete Reference Table: US Gallons to Liters

Gas Stations in Canada: Liters, Not Gallons

This is the number one source of confusion for Americans driving in Canada. Canadian gas stations sell fuel in liters, and the price is per liter — so a price that reads $1.75 means $1.75 per liter, not per gallon. To find the price per US gallon equivalent, multiply by 3.785.

Canada officially switched to liters in 1979. The practical impact for American road trippers: your 16-gallon tank needs about 60 liters to fill from empty. Watch the pump counter in liters and stop at 60 — you will not overfill.

Gas in Europe: Even More Expensive Per Gallon

European fuel prices are listed per liter in local currency. To compare to what Americans pay per gallon, multiply the liter price by 3.785 and then convert currency. At typical European prices of €1.60–€2.00/liter:

European gas prices are higher than American prices primarily because of higher fuel taxes — not higher base oil prices. European governments use fuel taxes as both a revenue source and a policy tool to encourage public transit use.

Cooking: Liters, Milliliters and American Measurements

European and British recipes use liters and milliliters. American recipes use cups, quarts, and gallons. Here is the complete kitchen conversion chart:

The most useful kitchen anchor: 1 cup ≈ 240 ml (exact: 236.59 ml). When a European recipe says 500 ml, that is just over 2 cups. When it says 1 liter, that is just over 4 cups — essentially one US quart.

US Gallon vs Imperial Gallon: The Critical Difference

The US gallon and the British (imperial) gallon are not the same. This trips up Americans reading older British cookbooks, fuel economy specs for UK cars, or any pre-1979 Canadian document:

The difference is about 20% — significant enough to matter for fuel economy comparisons. A British car advertised at "50 mpg" is using imperial gallons. In US mpg, that same car gets about 41 mpg. Always check which gallon a fuel economy figure uses before comparing.

Fuel Economy: mpg vs L/100km

American fuel economy is measured in miles per gallon (mpg). European and Canadian fuel economy uses liters per 100 kilometers (L/100km). These scales run in opposite directions — higher mpg is better, but lower L/100km is better. Here is a quick comparison:

The formula: L/100km = 235.215 ÷ mpg. So a car that gets 30 mpg uses 235.215 ÷ 30 = 7.84 L/100km. Going the other way: mpg = 235.215 ÷ L/100km.

Convert Any Volume Instantly

For any volume conversion — gallons, liters, quarts, milliliters, cups, fluid ounces, and more — use the ConvertProf Volume Converter. All factors follow exact international definitions. No rounding, no ads, works offline.