Convert gallons to liters instantly. Supports US gallons, UK (imperial) gallons, and other liquid volume units with precise conversion formulas.
A car's fuel tank holds 15 US gallons. How many liters is that?
Formula: 15 US gal × 3.78541 = 56.78 Liters
A typical mid-size sedan fuel tank is about 15 US gallons (~56.8 liters).
A water barrel holds 10 UK gallons. What is its volume in liters?
Formula: 10 UK gal × 4.54609 = 45.46 Liters
UK gallons are about 20% larger than US gallons.
A 2-liter bottle of soda contains how many US fluid ounces?
Formula: 2 L × 1000 ÷ 29.5735 = 67.63 fl oz
That's about 5.6 cans of soda (12 fl oz each).
A recipe calls for 3 quarts of broth. Convert to liters.
Formula: 3 qt × 946.353 ÷ 1000 = 2.84 Liters
1 quart is slightly less than 1 liter.
This converter uses milliliters (mL) as its base unit. All input values are converted to mL first, then converted to the target unit. This ensures maximum precision and consistency across all unit conversions.
| Unit | Value in mL |
|---|---|
| 1 US Gallon | 3,785.41 mL |
| 1 UK Gallon (Imperial) | 4,546.09 mL |
| 1 Liter | 1,000 mL |
| 1 US Fluid Ounce | 29.5735 mL |
| 1 US Cup | 236.588 mL |
| 1 US Pint | 473.176 mL |
| 1 US Quart | 946.353 mL |
| 1 Milliliter | 1 mL |
The US gallon (≈ 3.785 L) and the UK imperial gallon (≈ 4.546 L) are different units. The imperial gallon is about 20% larger than the US gallon. This difference dates back to historical measurement systems — the US uses the Queen Anne wine gallon of 231 cubic inches, while the UK uses the imperial gallon of about 277.4 cubic inches.
Always check which gallon your recipe, vehicle, or specification uses before converting!
Multiply by 3.785. A gallon of milk is about 3.79 liters.
Multiply by 4.546. A UK gallon of petrol is about 4.55 liters.
Divide by 3.785. A 5-liter jug is about 1.32 US gallons.
1 quart ≈ 0.946 liters. Four quarts is just under 3.79 liters (1 US gallon).
Converting between gallons and liters is straightforward once you know the correct conversion factor. The key is remembering that there are two different kinds of gallons: US gallons and UK (imperial) gallons. They are NOT the same size.
1 US gallon = 3.78541 liters
1 UK (imperial) gallon = 4.54609 liters
To convert from gallons to liters, simply multiply the number of gallons by the appropriate conversion factor. For example, 5 US gallons × 3.78541 = 18.93 liters. Similarly, 5 UK gallons × 4.54609 = 22.73 liters.
Our Gallon to Liter Converter supports 8 different volume units including US gallons, UK gallons, liters, milliliters, fluid ounces, cups, pints, and quarts. The converter uses milliliters as its base unit for maximum precision. Simply enter a value, select your source and target units, and click convert — the result, formula, and reference values in all common units are displayed instantly.
Gallon to liter conversions are needed in many everyday situations: