Unit Converter

Convert length, weight, temperature, and all physical units

How to Convert Gallons to Liters

One US gallon equals approximately 3.785 liters. Use this for converting volumes of detergent, paint, chemicals, and other liquids sold in gallons. Note: the Imperial gallon (UK) is about 4.546 liters, different from the US gallon.

Conversion Formula

L = gal × 3.78541

Quick Reference Table

Gallon	Liter
0.25	0.9464
0.5	1.8927
1	3.7854
2	7.5708
5	18.927
10	37.854
20	75.708

How to Use the Unit Converter

The Internet Octopus Unit Converter supports 14 categories and over 100 units. Enter a value and select units to see instant conversion results.

Supported Unit Categories

Length — Millimeter, centimeter, meter, kilometer, inch, foot, yard, mile, nautical mile, and more
Weight / Mass — Milligram, gram, kilogram, ton, pound, ounce, stone, grain, and more
Volume — Milliliter, liter, gallon, quart, pint, cup, fluid ounce, tablespoon, teaspoon, and more
Area — Square meter, square kilometer, acre, hectare, pyeong, and more
Temperature — Convert between Celsius, Fahrenheit, and Kelvin
Speed — Meter/second, kilometer/hour, mile/hour, knot, foot/second, and more
Time — Millisecond, second, minute, hour, day, week, year, and more
Digital Storage — Bit, byte, KB, MB, GB, TB, PB, and KiB, MiB, GiB, TiB, and more
Pressure — Pascal, kilopascal, bar, atmosphere, PSI, mmHg, and more
Energy — Joule, kilojoule, calorie, kilocalorie, watt-hour, kilowatt-hour, BTU, electronvolt, and more
Power — Watt, kilowatt, megawatt, horsepower, and more
Angle — Degree, radian, gradian, turn, and more
Force — Newton, kilonewton, pound-force, kilogram-force, and more
Frequency — Hertz, kilohertz, megahertz, gigahertz, and more

How to Use

Enter a number in the left input field.
Select the source unit from the left dropdown.
Select the target unit from the right dropdown — only compatible units are shown.
The result appears instantly. Use the swap button to reverse the conversion.