Convert Gallons to Liters (gal to L)
Convert gallons to liters instantly. 1 gal = 3.78541 L. Free gallons-to-liters converter with table and formula.
This gallons to liters converter gives you exact results as you type. One US gallon equals 3.78541 liters (1 gal = 3.78541 L). It works offline once loaded and never sends your data anywhere.
The US liquid gallon is defined as exactly 3.785411784 liters — about 17% smaller than the UK imperial gallon. Conversions like this one matter in liquid volume in cooking, fuel, beverages, and chemistry. It bridges US customary units and the metric system, which is why this conversion comes up so often. A liter is defined as exactly one cubic decimeter — a 10 cm cube of water weighs about one kilogram.
3.785413,785.4113.9999988.00000416.000008128.000068Conversion formula
liters = US gallons × 3.78541Conversion table
| Value | Converted |
|---|---|
| 1 gal | 3.78541 L |
| 2 gal | 7.57082 L |
| 5 gal | 18.92705 L |
| 10 gal | 37.8541 L |
| 25 gal | 94.63525 L |
| 50 gal | 189.2705 L |
| 100 gal | 378.541 L |
Frequently Asked Questions
How many liters are in a US gallon?
1 gal = 3.78541 L. So 10 US gallons equal 37.8541 liters.
How do you convert US gallons to liters manually?
Multiply the number of US gallons by 3.78541: liters = US gallons × 3.78541. For example, 10 gal × 3.78541 = 37.8541 L.
Is the gallons to liters conversion exact?
The factor 3.78541 is rounded for display. The underlying unit definitions are exact, and this converter computes with full floating-point precision.
Is this gallons to liters converter free and private?
Yes. It is completely free, requires no signup, and the conversion happens entirely in your browser — no values are sent to any server.
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