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Liter to Gallon Converter

Convert liters to gallons instantly, with separate results for US liquid and UK Imperial gallons.

Metric Scale
L
US Liquid
gal
Common Volume Container Presets
Converted Result
1 L = 0.264172 US gal
Fluid Ounces
33.81 fl oz
Quarts
1.057 qt
Milliliters
1,000 mL
Formula Reference

Liters to Gallons Formula

One US liquid gallon equals 3.78541 liters (approx 0.264172 US gallons per liter). An Imperial UK gallon equals 4.54609 liters.

$$\text{Gallons (US)} = \text{Liters} \times 0.264172$$
View Full Formula, Step-by-Step Guide & Worked Examples
Liquid Volume & Fuel Guide

Understanding Liters (L) & Gallons (gal)

Explore liquid volume conversions, the difference between US Liquid Gallons and UK Imperial Gallons, automobile gas tank capacities, and mental math shortcuts.

Liters to Gallons Volume Benchmarks

Quick reference table for beverage packaging, car gas tanks, and water dispensers.

Volume Benchmark / Packaging Liters (L) US Liquid Gallons UK Imperial Gallons
🥤 Standard Beverage Bottle 1.0 L 0.264 gal 0.220 gal
🥛 Standard Milk Jug (US 1 Gallon) 3.785 L 1.000 gal 0.833 gal
🚰 Office Water Cooler Jug (5 Gal) 18.927 L 5.000 gal 4.163 gal
⛽ Compact Car Fuel Tank 45.0 L 11.888 gal 9.899 gal
🚘 SUV / Truck Fuel Tank 75.0 L 19.813 gal 16.498 gal

US Liquid vs UK Imperial Gallons

A US Liquid Gallon is defined as 231 cubic inches, which equals exactly 3.785411784 liters.

A UK Imperial Gallon (used in Britain, Canada, and Ireland) is defined as 10 pounds of water at 62°F, which equals exactly 4.54609 liters (~20% larger than a US gallon).

Important Fuel Economy Note: Because the UK gallon is larger, 30 MPG (UK) is equivalent to ~25 MPG (US).

Automobile Gas Tank Capacities

  • Small Hatchback (35 Liters) 9.25 US gal
  • Midsize Sedan (55 Liters) 14.53 US gal
  • Full-size SUV (80 Liters) 21.13 US gal

Pro Tip: Quick Mental Approximation Shortcut

To quickly estimate Liters to US Gallons in your head:
Divide the Liters by 4, then add 5% to the result.

Example for 40 Liters: Divide by 4 = 10 → Add 5% (0.5) = 10.5 Gallons (Exact value is 10.56 gal!).

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Education

How Liter to Gallon Conversion Works

01

Two Different Gallon Formulas

This converter supports two gallon standards: the US Liquid Gallon, where Gallons = Liters x 0.264172 (1 US gallon = 3.785411784 liters), and the UK Imperial Gallon, where Gallons = Liters x 0.219969 (1 UK gallon = 4.54609 liters). Selecting the correct mode matters because the two gallons differ in size by about 20 percent.

02

Why US and UK Gallons Differ

The US gallon traces back to the old English wine gallon of 231 cubic inches, while the UK Imperial gallon was redefined in 1824 as the volume of 10 pounds of water at 62 degrees Fahrenheit, equal to 277.42 cubic inches. Because the Imperial gallon is larger, a fuel economy figure like 30 MPG (UK) is only about 25 MPG (US) for the same actual fuel consumption.

03

Worked Example: 40 Liters to US Gallons

Convert 40 liters of fuel to US gallons by multiplying 40 by 0.264172, which gives 10.567 US gallons. Using the UK Imperial factor instead, the same 40 liters equals about 8.799 UK gallons.

04

When to Use This Converter

This tool is useful for comparing fuel tank capacities and fuel economy figures across countries, or sizing aquariums and water containers labeled in gallons. Use the ML to OZ Converter for smaller liquid volumes, or the Weight Converter and Length Converter for other everyday unit conversions.

Good to know

Questions, answered

Quick answers about how this tool works.

1 liter equals 0.264172 US liquid gallons or 0.219969 UK Imperial gallons.

There are 3.78541 liters in 1 US liquid gallon.

There are 4.54609 liters in 1 UK Imperial gallon.

50 liters is equal to 13.2086 US liquid gallons.

The US gallon is based on the historic wine gallon (231 cubic inches), while the UK Imperial gallon was defined in 1824 based on the volume of 10 pounds of water (277.42 cubic inches).

20 liters is equal to 5.28344 US gallons.

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