Gallons to Liters Converter

Common gal to l conversions

How this conversion works

1 US gallon = 3.78541178 liters. Multiply US gallons by 3.78541178.

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What you are converting

US gallon

A US liquid gallon equals 231 cubic inches, about 3.785 liters, and measures fuel, milk, and paint sold in the United States; a typical gas pump counts gallons as it fills your tank.

Liter

A liter is the volume of a cube measuring 10 centimeters per side, equal to 1,000 milliliters; it labels soda bottles, engine oil, and beverage cartons across most of the world.

Why convert and when you would use this

Drivers comparing imported cars need it because US fuel economy uses miles per gallon while most countries quote liters per 100 kilometers. Home brewers and pool owners also translate US-sized ingredient jugs into liter-marked local containers before mixing chemicals or recipes.

Worked example

Convert 5 US gallons to liters by multiplying 5 by 3.78541178, which gives exactly 18.9270589 liters. In practice, a 5-gallon water cooler bottle therefore holds just under 19 liters, which explains why European 19-liter office bottles look nearly identical in size.

Rounding and accuracy

Use two decimal places for shopping, cooking, and fuel estimates, since pumps and labels rarely show more precision. Keep four to six decimals for laboratory work, dosage calculations, or engineering specs. Always multiply with the full 3.78541178 factor and round only the final result.

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