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Gallons to Liters Calculator

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How this gallons to litres calculator works

Enter a volume in US gallons. The calculator multiplies it by 3.78541 and shows the result in litres, always to four decimal places. Litres = gallons × 3.78541.

The input is a US liquid gallon, as the field label says. A US gallon is 231 cubic inches. With one inch equal to 2.54 centimetres, that volume is 3.785411784 litres. This page uses 3.78541, that figure rounded to five decimal places. A UK imperial gallon is a different size, about 4.54609 litres, and it is not the factor here.

Worked example: 1 × 3.78541 = 3.78541, and four decimal places print that as 3.7854 L. Ten gallons is 10 × 3.78541 = 37.8541 L. Five gallons is 18.92705, and the next digit rounds the fourth decimal up, so the page shows 18.9271 L. Half a gallon is 1.8927 L.

Any finite number is accepted, including 0 and negatives. 0 gallons is 0.0000 L, and −1 gallon is −3.7854 L. An empty box shows --. The result is labelled L. Millilitres are not printed. One litre is 1,000 millilitres, so 3.7854 L is 3,785.4 millilitres after the four-decimal rounding.

Gallons to litres examples

Each litre value is the US gallons multiplied by 3.78541, shown to four decimal places.

US gallonsLitresWhat it marks
00.0000 LZero
0.51.8927 LHalf a US gallon
13.7854 LOne US gallon
27.5708 LTwo US gallons
518.9271 LRounded at the fourth decimal
1037.8541 LTen US gallons
1556.7812 LFifteen US gallons
2075.7082 LTwenty US gallons

How to read the result

  • Multiply by 3.78541

    1 US gallon is printed as 3.7854 L after four-decimal rounding.

  • US gallon

    The factor is the US liquid gallon. A UK gallon is not 3.78541 litres.

  • Four decimal places

    5 gallons is printed as 18.9271 L. 20 gallons is 75.7082 L.

  • Zero and negatives

    0 gallons is 0.0000 L. An empty box stays --.

Frequently asked questions

  • How do you convert gallons to litres?

    Multiply the US gallons by 3.78541. Litres = gallons × 3.78541. The page shows that result to four decimal places. 1 gallon is 3.7854 L, and 10 gallons is 37.8541 L.

  • Is this a US gallon or a UK gallon?

    The field is labelled Gallons (US). The factor 3.78541 is the US liquid gallon, rounded to five decimal places. A UK (imperial) gallon is larger, about 4.54609 litres, and this page does not use that figure.

  • Why is 1 gallon shown as 3.7854 L and not 3.78541 L?

    The multiplication uses 3.78541, then the result is fixed at four decimal places. The last digit of the factor is dropped, so 1 × 3.78541 is printed as 3.7854 L. 2 gallons is 7.57082, printed as 7.5708 L.

  • Where does 3.78541 come from?

    A US gallon is 231 cubic inches, and one inch is 2.54 centimetres, so the exact litre value is 3.785411784. This calculator multiplies by 3.78541, which is that value rounded to five decimal places.

  • What is half a gallon in litres?

    0.5 × 3.78541 = 1.892705, shown as 1.8927 L. Five gallons is 18.92705, and the fourth decimal rounds up, so the page shows 18.9271 L.

  • How many litres are in 20 gallons?

    20 × 3.78541 = 75.7082 L. Fifteen gallons is 56.78115, shown as 56.7812 L.

  • Can the gallon value be zero or negative?

    Yes. 0 gallons is 0.0000 L. −1 gallon is −3.7854 L. An empty box shows --. Any finite number is multiplied by 3.78541.

  • Why are there always four decimal places?

    The litre figure is fixed at four digits after the decimal. 0 appears as 0.0000 L, and 10 gallons appears as 37.8541 L.

  • How do I turn litres back into US gallons?

    Divide the litres by 3.78541. 3.78541 ÷ 3.78541 = 1 gallon. 37.8541 ÷ 3.78541 = 10 gallons before display rounding.

  • Does this convert to millilitres?

    The result is in litres, labelled L. One litre is 1,000 millilitres, so 1.8927 L from half a gallon is 1,892.7 millilitres. The page does not print millilitres.