Convert US gallons, UK gallons, and other volume units to liters instantly with our free online converter. Whether you're converting fuel economy, cooking recipes, or liquid measurements, get accurate volume conversions in seconds. Supports both-way conversion between gallons, liters, milliliters, quarts, pints, cups, and fluid ounces.
Quick reference for frequently used volume conversions between gallons, liters, and other common units.
| US Gallons | Liters | UK Gallons | Quarts | Pints | Cups |
|---|---|---|---|---|---|
| 0.25 | 0.946 | 0.208 | 1 | 2 | 4 |
| 0.5 | 1.893 | 0.416 | 2 | 4 | 8 |
| 1 | 3.785 | 0.833 | 4 | 8 | 16 |
| 2 | 7.571 | 1.665 | 8 | 16 | 32 |
| 3 | 11.356 | 2.498 | 12 | 24 | 48 |
| 4 | 15.142 | 3.330 | 16 | 32 | 64 |
| 5 | 18.927 | 4.163 | 20 | 40 | 80 |
| 10 | 37.854 | 8.326 | 40 | 80 | 160 |
| 15 | 56.781 | 12.489 | 60 | 120 | 240 |
| 20 | 75.708 | 16.652 | 80 | 160 | 320 |
| 50 | 189.271 | 41.630 | 200 | 400 | 800 |
| 100 | 378.541 | 83.260 | 400 | 800 | 1,600 |
A typical car fuel tank holds 12-20 US gallons (45-76 liters). In the US, fuel economy is measured in miles per gallon (mpg), while most other countries use liters per 100 km.
A standard milk jug in the US is 1 gallon (3.785 L). In the UK and many other countries, milk is commonly sold in 1-liter, 2-liter, or 4-pint (2.27 L) containers.
Recipes often call for cups, pints, quarts, or liters. Knowing that 1 cup = 236.6 mL, 1 pint = 473.2 mL, and 1 quart = 946.4 mL helps when following international recipes.
The recommended daily water intake is about 2 liters (0.53 US gallons) for women and 3 liters (0.79 US gallons) for men. A standard water bottle is 500 mL (0.13 gal).
The standard conversion factors between gallons and liters are:
To convert US gallons to liters:
To convert UK gallons to liters:
To convert liters to US gallons (reverse):
To convert liters to UK gallons (reverse):
All volume conversions in our calculator are based on the liter value:
Converting gallons to liters is straightforward using these steps:
Example 1: Convert 5 US gallons to liters
5 × 3.78541 = 18.927 L
Also: 18,927 mL • 20 qt • 40 pt • 80 cups • 640 fl oz
Example 2: Convert 10 UK gallons to liters
10 × 4.54609 = 45.461 L
UK gallons are about 20% larger than US gallons
Example 3: Convert 2 liters to US gallons
2 ÷ 3.78541 = 0.528 US gal
Also: 2.113 pt • 4.227 cups • 67.628 fl oz
The US gallon and the UK (Imperial) gallon are different sizes due to historical measurement standards. The US gallon is based on the old English wine gallon (231 cubic inches), while the UK gallon is based on the Imperial gallon defined in 1824 as the volume of 10 pounds of water at 62°F.
A UK gallon is approximately 20% larger than a US gallon. This difference matters significantly for fuel purchases, food production, and industrial applications. Always verify which gallon type is being used.
Type any numeric value in the input field. You can use whole numbers or decimals for precise conversions, such as 1.5 or 0.75.
Choose the unit you're converting from and the unit you want to convert to using the dropdown menus. The converter supports 8 different volume units.
Click "Convert" or press Enter. Your result appears instantly, along with a complete breakdown of all volume units. Use "Swap Units" to reverse the conversion.
Click "Copy Result" to copy the conversion to your clipboard. The live formula display shows the exact calculation used for your conversion.
This gallon to liter converter is useful in many everyday situations:
Converting between gallons and liters is essential in our globally connected world. The gallon is the primary unit for measuring liquid volume in the United States and a few other countries, while the liter is the standard unit of volume in the metric system, used by most countries worldwide. Understanding how to convert between these systems is crucial for international travel, cooking, fuel economy, and countless other applications.
Whether you're comparing fuel prices abroad, following a recipe from a different country, or working with international product specifications, knowing how to convert gallons to liters ensures accuracy and eliminates confusion.
The US gallon (3.78541 L) and the UK Imperial gallon (4.54609 L) are significantly different — about 20% larger for the Imperial gallon. This discrepancy dates back to historical measurement standards. The US gallon is based on the Queen Anne wine gallon of 1707 (231 cubic inches), while the UK Imperial gallon was defined in 1824 as the volume of 10 pounds of distilled water at 62°F (about 277.42 cubic inches).
Most countries that historically used the Imperial system have now adopted the metric system, but the UK gallon is still used for some purposes in the United Kingdom, Canada, and several Caribbean nations. Our converter supports both gallon types so you can convert with confidence.
⚠️ Important Disclaimer: This Gallon to Liter Converter is provided for informational and educational purposes only. While we strive for maximum accuracy using the internationally standardized conversion factors, we cannot guarantee that the results are suitable for all professional, commercial, scientific, or medical applications. Always verify critical volume measurements with authoritative sources. For pharmaceutical, laboratory, or industrial processes where precise volumes are critical, consult appropriate professionals and use certified measurement equipment. This tool is not a substitute for professional measurement services.