US gallon to litre — free converter
Formula
litre = US gallon × 3.78541
Worked example
15 US gallons = 56.7812 litres.
Conversion table
| Us gallon | Litre |
|---|---|
| 1 US gallons | 3.78541 litres |
| 2 US gallons | 7.57082 litres |
| 5 US gallons | 18.9271 litres |
| 10 US gallons | 37.8541 litres |
| 25 US gallons | 94.6353 litres |
| 50 US gallons | 189.271 litres |
| 100 US gallons | 378.541 litres |
What these units mean
A US gallon is the volume used for fuel and milk in the United States. A litre is a metric volume, the size of a large bottle of water or milk. When you change from US gallons to litres, you are simply expressing the same amount on a different scale, so the quantity itself does not change — only the number and the unit label do. A quick everyday check helps: picture the amount in your own life first, then let the converter do the arithmetic, and the result should feel roughly right before you use it for a purchase, a recipe or a journey.
FAQs about US gallon to litre
How many litres are in 1 US gallon?
1 US gallon = 3.78541 litre.
What is the formula for US gallon to litre?
litre = US gallon × 3.78541. This conversion is a multiplication by a fixed standard factor.
What is 15 US gallons in litres?
15 US gallons = 56.7812 litres.
How do I convert litres back to US gallons?
Use the reverse page: litre to US gallon. The converter on that page swaps the direction for you.
Is the US gallon to litre result exact?
The factor is the standard published factor, and the converter shows the result rounded for reading. For everyday use this is exact enough; for engineering or laboratory work, check the rounding your task requires.