US gallon to Liter Converter
Type a value — the answer appears instantly. 1 gal = 3.78541 L.
Reviewed by the OmniCalc teamMethod verified 2026-07-01
3.78541 liters
= 3,785.41 ml= 16 cup
equals 3.78541 litersFormula: L = gal × 3.7854118
US gallon to Liter formula
L = gal × 3.7854118
Convert 5 US gallons to liters
- Start with 5 US gallons.
- Multiply by the conversion factor: 5 × 3.78541 = 18.9271.
- So 5 gal = 18.9271 L.
US gallon to Liter conversion table
| US gallons (gal) | Liters (L) |
|---|---|
| 0.01 gal | 0.0378541 L |
| 0.1 gal | 0.378541 L |
| 0.25 gal | 0.946353 L |
| 0.5 gal | 1.89271 L |
| 1 gal | 3.78541 L |
| 2 gal | 7.57082 L |
| 3 gal | 11.3562 L |
| 4 gal | 15.1416 L |
| 5 gal | 18.9271 L |
| 6 gal | 22.7125 L |
| 7 gal | 26.4979 L |
| 8 gal | 30.2833 L |
| 9 gal | 34.0687 L |
| 10 gal | 37.8541 L |
| 15 gal | 56.7812 L |
| 20 gal | 75.7082 L |
| 25 gal | 94.6353 L |
| 30 gal | 113.562 L |
| 40 gal | 151.416 L |
| 50 gal | 189.271 L |
| 75 gal | 283.906 L |
| 100 gal | 378.541 L |
| 250 gal | 946.353 L |
| 500 gal | 1,892.71 L |
| 1,000 gal | 3,785.41 L |
| 5,000 gal | 18,927.1 L |
| 10,000 gal | 37,854.1 L |
Unit definitions
What is a US gallon?
The US gallon is defined as exactly 231 cubic inches, or 3.785411784 litres. It is the standard unit for fuel, milk, and large liquid quantities in the United States. It is about 20% smaller than the imperial gallon.
What is a liter?
The litre is the metric unit of volume equal to one cubic decimetre, or 1000 cubic centimetres. It is the standard measure for beverages, fuel, and fluids worldwide. One litre of water weighs almost exactly one kilogram.
Frequently asked questions
How many liters are in one US gallon?
One US gallon equals 3.78541 liters (1 gal = 3.78541 L).
How do I convert US gallons to liters?
Multiply the value in US gallons by 3.78541. For example, 10 gal × 3.78541 = 37.8541 L.
Which is bigger — a US gallon or a liter?
A US gallon is bigger: one US gallon contains 3.78541 liters.
Is this US gallon to liter converter free?
Yes — the converter is free, works offline once loaded, and computes instantly in your browser without sending your numbers to a server.
Conversion factors follow international definitions (SI / NIST). Last verified 2026-07-01.