Gallons to Liters Converter
Convert US gallons and UK gallons to liters instantly. Free online volume converter with conversion table and formula.
Why Convert Volume from Gallons to Liters?
The liter (L) is the standard unit of volume used in most countries worldwide. If you're traveling from the US to another country, comparing international fuel prices, or working with metric recipes, you'll need to convert gallons to liters.
This conversion is essential for international travel, understanding global fuel costs, scientific measurements, and working with metric-based equipment and containers.
What is a Gallon?
The gallon is a unit of volume in the imperial measurement system. There are two different gallon sizes in use:
- US Gallon: 3.78541 liters - used in the United States
- UK/Imperial Gallon: 4.54609 liters - used in the United Kingdom and some Commonwealth countries
- One US gallon contains 128 US fluid ounces
- One US gallon equals 4 US quarts or 8 US pints
What is a Liter?
The liter (L) is a metric unit of volume. It is the most widely used unit for measuring liquid volumes globally.
- One liter equals 1,000 milliliters (mL)
- One liter equals 1 cubic decimeter (dm³)
- One liter of water at 4°C weighs approximately 1 kilogram
- Standard unit for beverage containers worldwide
Gallons to Liters Conversion Formula
To convert US gallons to liters, use the following formula:
To convert UK gallons to liters:
Conversion Table: Gallons to Liters
Here is a quick reference table for common volume conversions:
| US Gallons | Liters (L) | UK Gallons | Liters (L) |
|---|---|---|---|
| 0.5 gal | 1.89 L | 0.5 gal | 2.27 L |
| 1 gal | 3.79 L | 1 gal | 4.55 L |
| 2 gal | 7.57 L | 2 gal | 9.09 L |
| 3 gal | 11.36 L | 3 gal | 13.64 L |
| 4 gal | 15.14 L | 4 gal | 18.18 L |
| 5 gal | 18.93 L | 5 gal | 22.73 L |
| 10 gal | 37.85 L | 10 gal | 45.46 L |
| 15 gal | 56.78 L | 15 gal | 68.19 L |
| 20 gal | 75.71 L | 20 gal | 90.92 L |
| 25 gal | 94.64 L | 25 gal | 113.65 L |
| 50 gal | 189.27 L | 50 gal | 227.30 L |
US Gallon vs UK Gallon
It's important to know which gallon type you're working with:
| Property | US Gallon | UK/Imperial Gallon |
|---|---|---|
| Volume in Liters | 3.78541 L | 4.54609 L |
| Used In | United States, Latin America | UK, Canada, some Commonwealth nations |
| Fluid Ounces | 128 US fl oz | 160 UK fl oz |
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Convert US gallons to liters instantly. To do it by hand, multiply the gallons by 3.78541 — so 5 gallons = 18.93 liters. The US gallon equals exactly 3.785411784 liters; the liter is the metric unit of volume. (The UK imperial gallon is larger, about 4.546 liters.)
How do I convert gallons to liters?
- Enter the volume in US gallons.
- The result in liters appears automatically.
- Handy for fuel economy and recipes.
What is the gallons to liters formula?
liters = US gallons × 3.78541
Quick estimate: multiply the gallons by about 3.8.
Quick reference
| US Gallons | Liters |
|---|---|
| 1 gal | 3.79 L |
| 5 gal | 18.93 L |
| 10 gal | 37.85 L |
| 20 gal | 75.71 L |
Frequently asked questions
How many liters is 1 gallon?
One US gallon is about 3.79 liters.
Is this US or UK gallons?
This converter uses US gallons (3.785 L). A UK imperial gallon is about 4.546 L.
Related tools & guides
- Liters to Gallons Converter (reverse)
- Volume Converter (all units)