Converter

Convert US gallons to litres

US gallons (gal)

litres (L)

3.7854

Formula: L = gal × 3.7854

gal to L quick reference table

US gallons (gal)	litres (L)
1	3.7854
2	7.5708
5	18.9271
10	37.8541
20	75.7082
25	94.6353
50	189.271
100	378.541
250	946.353
500	1,892.71
1,000	3,785.41

Everyday gal values, converted

1 gal = 3.7854 L — one US gallon of milk.
15 gal = 56.7812 L — a car fill-up.

Where gal to L comes up

Volume conversions turn up in cooking, fuel economy and drinks measures. American and metric recipes use different base units, and a cup is not the same size in every country.

Doing gal to L in your head

Multiply by 3.79 for a close estimate; the calculator above keeps the full factor of 3.7854.

Precision and rounding

One US gallon is exactly 3.7854 litres under the current definitions of both units, so the only judgement call is how many digits you keep. Two decimal places is already finer than most household scales and tape measures can read, while engineering and medical work usually keeps the full factor and rounds once at the end rather than at every step.

Frequently Asked Questions & How-To

1 US gallon equals 3.7854 litres. 10 US gallons is 37.8541 litres, and 100 US gallons is 378.541 litres.

The conversion uses L = gal × 3.7854. Type any amount above and the result updates as you type — no button press and no page reload.

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