Gallons to Liters Converter

Convert gallons to liters instantly. Works for US and UK gallons with metric equivalents.

Conversion table

Volume	Liters	Milliliters	Cubic Meters
1	3.7854 L	3,785.41 mL	0.0038 m³
2	7.5708 L	7,570.82 mL	0.0076 m³
3	11.3562 L	11,356.23 mL	0.0114 m³
4	15.1416 L	15,141.64 mL	0.0151 m³
5	18.9271 L	18,927.05 mL	0.0189 m³
10	37.8541 L	37,854.1 mL	0.0379 m³
15	56.7812 L	56,781.15 mL	0.0568 m³
20	75.7082 L	75,708.2 mL	0.0757 m³
25	94.6353 L	94,635.25 mL	0.0946 m³
30	113.5623 L	113,562.3 mL	0.1136 m³
40	151.4164 L	151,416.4 mL	0.1514 m³
50	189.2705 L	189,270.5 mL	0.1893 m³
60	227.1246 L	227,124.6 mL	0.2271 m³
70	264.9787 L	264,978.7 mL	0.265 m³
75	283.9058 L	283,905.75 mL	0.2839 m³

Conversion Tips

US gallon = 3.785 liters, UK gallon = 4.546 liters
UK gallons are ~20% larger than US gallons
1 gallon = 4 quarts = 8 pints = 16 cups
For fuel: multiply MPG by 0.425 to get km/L

Understanding Gallons and Liters

Gallons and liters are both units of volume, but they come from different measurement systems. The gallon is used primarily in the United States (US gallon = 3.785 L) and the United Kingdom (Imperial gallon = 4.546 L). The liter is the standard metric unit used worldwide. Understanding the conversion is essential for international cooking, fuel economy comparisons, and scientific applications.

How the Conversion Works

To convert US gallons to liters, multiply by 3.78541. For UK gallons, multiply by 4.54609. The difference exists because the US gallon is based on the wine gallon (231 cubic inches) while the UK gallon is based on 10 pounds of water. This converter automatically detects which gallon type you're using based on your selection.

Important Considerations

US gallon (3.785 L) is used in the United States
UK/Imperial gallon (4.546 L) is used in the UK and some Commonwealth countries
Always verify which gallon type your source uses
Fuel economy varies significantly: 30 MPG (US) ≈ 36 MPG (UK)
Recipes from different countries may use different gallon sizes
Scientific applications typically use liters or milliliters

Common Volume Conversions

1 US gallon = 3.785 liters = 128 fl oz
1 UK gallon = 4.546 liters = 160 UK fl oz
1 liter = 0.264 US gallons = 0.22 UK gallons
1 quart = 0.946 liters (US) or 1.137 liters (UK)
1 pint = 473 mL (US) or 568 mL (UK)
1 cup = 237 mL (US) or 284 mL (UK)

Conversion Examples

Real-world scenarios

Car Fuel Tank

Tank capacity: 15 US gallons
Convert: 15 × 3.785 = 56.78 liters
This is typical for mid-size sedans

15 gal = 56.78 L

Recipe Conversion

Recipe calls for 0.5 UK gallons of milk
Convert: 0.5 × 4.546 = 2.27 liters
Note: UK gallon is larger than US

0.5 UK gal = 2.27 L

Frequently Asked Questions

What's the difference between US and UK gallons?

A US gallon equals 3.785 liters (128 fl oz), while a UK/Imperial gallon equals 4.546 liters (160 UK fl oz). The UK gallon is approximately 20% larger than the US gallon.

How do I convert gallons to liters?

Multiply US gallons by 3.78541 or UK gallons by 4.54609. For example, 5 US gallons = 5 × 3.785 = 18.93 liters.

Which countries use gallons?

The US uses US gallons for fuel and liquids. The UK officially uses liters but still references gallons informally. Some Caribbean and Latin American countries also use US gallons.

Why are there different gallon sizes?

The US gallon (231 cubic inches) was based on the English wine gallon, while the UK Imperial gallon was defined in 1824 as the volume of 10 pounds of water at 62°F.

How many liters in a gallon of gas?

In the US, 1 gallon of gas = 3.785 liters. Gas stations in metric countries sell fuel by the liter. To compare prices, divide the per-gallon price by 3.785.

How do I convert fuel economy from MPG to L/100km?

Divide 235.215 by the MPG value. For example, 30 MPG = 235.215 ÷ 30 = 7.84 L/100km. Lower L/100km means better fuel economy.