Gallons to Liters Converter
Convert gallons to liters and vice versa instantly. Supports both US gallons and UK (Imperial) gallons. Perfect for cooking, fuel consumption, science, and everyday volume conversions.
What Is a Gallon?
A gallon is a unit of volume used primarily in the United States and the United Kingdom. There are two different definitions of a gallon:
- US Gallon (gal): Defined as exactly 231 cubic inches, equal to 3.785411784 liters. It is the most common gallon used in the US for fuel, milk, and other liquids.
- UK Gallon (Imperial gallon): Defined as exactly 4.54609 liters. It is used in the United Kingdom and some Commonwealth countries.
This converter supports both types of gallons, so you can easily convert between them and liters.
How Does the Gallons to Liters Converter Work?
The converter uses the exact conversion factors:
1 US gallon = 3.785411784 L
1 UK gallon = 4.54609 L
To convert gallons to liters: L = gal × 3.785411784 (US) or L = gal × 4.54609 (UK)
To convert liters to gallons: gal = L ÷ 3.785411784 (US) or gal = L ÷ 4.54609 (UK)
Simply enter a value in either gallons or liters, select the direction of conversion, choose your gallon type, and the calculator will instantly compute the equivalent volume.
Why Use This Gallons to Liters Converter?
- Two-Way Conversion: Convert from gal to L and from L to gal.
- Both Gallon Types: Supports US gallons and UK (Imperial) gallons.
- Multiple Output Units: Display results in liters, milliliters, centiliters, or deciliters.
- Precise Results: Uses exact conversion factors for both gallon types.
- Free & Private: No registration, no data storage.
Common Volume Equivalents
- 1 US gallon = 3.785 L = 128 fl oz
- 1 UK gallon = 4.546 L = 160 fl oz
- 1 L = 0.264 US gal = 0.220 UK gal
- 1 US gallon ≈ 0.833 UK gallons
- 1 UK gallon ≈ 1.201 US gallons
❓ Gallons to Liters Converter FAQ
How many liters are in a US gallon?
There are exactly 3.785411784 liters in one US gallon.
How many liters are in a UK gallon?
There are exactly 4.54609 liters in one UK (Imperial) gallon.
What is the difference between a US gallon and a UK gallon?
A US gallon is smaller than a UK gallon. 1 US gallon = 3.785 L, while 1 UK gallon = 4.546 L. The UK gallon is about 20% larger.
How many US gallons are in a liter?
1 liter = 0.2641720524 US gallons.
How many UK gallons are in a liter?
1 liter = 0.2199692483 UK gallons.
What is the formula for converting gallons to liters?
For US gallons: Liters = Gallons × 3.785411784. For UK gallons: Liters = Gallons × 4.54609.
What is the formula for converting liters to gallons?
For US gallons: Gallons = Liters ÷ 3.785411784. For UK gallons: Gallons = Liters ÷ 4.54609.
Why are there different gallon sizes?
The US gallon is based on the wine gallon used in England before 1824, while the UK (Imperial) gallon was standardized in 1824. The US continues to use the smaller gallon, while the UK uses the larger Imperial gallon.
How many fluid ounces are in a gallon?
A US gallon has 128 fluid ounces. A UK (Imperial) gallon has 160 fluid ounces.
How do I convert gallons to liters for fuel consumption?
For US fuel economy (mpg), multiply gallons by 3.785411784 to get liters. For UK fuel economy, multiply by 4.54609. This converter handles both.
How do I convert liters to gallons for cooking?
Divide the number of liters by 3.785411784 for US gallons, or by 4.54609 for UK gallons. This converter does the math for you.
What is the symbol for gallons?
The symbol for gallons is gal.
What is the symbol for liters?
The symbol for liters is L (or lowercase l).
How do I convert gallons to liters in my head?
For US gallons, multiply by 3.8 (approximately). For example, 5 US gal × 3.8 ≈ 19 L. For UK gallons, multiply by 4.5. For precise results, use this calculator.
Can I use this calculator for both US and UK gallons?
Yes. The calculator includes a toggle to switch between US gallons and UK (Imperial) gallons, and the conversion factors update automatically.
What is the difference between a gallon and a liter?
A gallon is an imperial unit of volume, while a liter is a metric unit. One US gallon is approximately 3.785 liters, and one UK gallon is approximately 4.546 liters.
How many gallons are in a cubic meter?
1 cubic meter = 264.172 US gallons = 219.969 UK gallons.
Is a gallon the same as a quart?
No. One gallon equals 4 quarts. A quart is one-quarter of a gallon.