1 Gallon [liquid] to Liters

1 gal ≈ 3.7854 L

Calculation: L = 1 gal × 3.78541 ≈ 3.7854 L

Gallon [liquid] to Liter Converter

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How much is 1 gal?

3,785 mL (128 fl oz) equals about 3.79 liters, a large container volume.

1 gal on the liter scale

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1 gal = 3.785 L

Did you know? One US gallon is 3,785 mL.

1 US gallon = 3,785 mL = 128 fl oz. The Imperial (UK) gallon is larger at 4,546 mL.

How to Convert Gallon [liquid] to Liter

1 gallon [liquid] = 3.78541 liters exact

Liter = Gallon [liquid] × 3.78541

Example: 1 gal × 3.78541 = 3.7854 L

Reverse Conversion

To convert liters back to gallons [liquid]:

  • Remember, 1 liter equals 0.264172 gallons [liquid].
  • To convert 3.7854 L to gal, multiply 3.7854 x 0.264172, resulting in 1 gal.

exact This conversion factor is exact by international definition.

1 gal is also equal to:

Frequently Asked Questions

How much is 1 gallon [liquid] in liters?

1 gallon [liquid] equals 3.7854 liters. This is calculated by multiplying 1 by the conversion factor 3.78541.

What does 1 gallon [liquid] look like in liters?

1 gallon [liquid] equals 3.7854 liters, a conversion commonly needed in cooking recipes, liquid measurements, and container sizing.

How do you calculate 1 gallon [liquid] to liters?

Multiply 1 by the conversion factor 3.78541. The calculation is 1 × 3.78541 = 3.7854 liters. This factor is defined by international measurement standards.

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1 gallon [liquid] = 3.78541 liters
1 gallon [liquid] = 3.78541 liters — conversion chart

Nearby Conversions

0.5 gallons [liquid]1.893 liters 1.5 gallons [liquid]5.678 liters 2 gallons [liquid]7.571 liters 2.5 gallons [liquid]9.464 liters 3 gallons [liquid]11.36 liters 3.5 gallons [liquid]13.25 liters 4 gallons [liquid]15.14 liters 4.5 gallons [liquid]17.03 liters 5 gallons [liquid]18.93 liters 5.5 gallons [liquid]20.82 liters 6 gallons [liquid]22.71 liters

For general conversions between gallons [liquid] and liters, see the gallons [liquid] to liters converter.

Conversion factors verified against NIST, BIPM, ISO 80000-3 1 US gallon = 3.785411784 L (exact, US customary). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.