Seldons
gallons to liters
1 US gallon = 3.78541 liters.
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How do you convert US gallons to liters?
Use this formula. It is exact — these units are defined by international agreement, not measured.
L = gal × 3.78541178
Example: 10 gal × 3.78541178 = 37.8541 L.
gallons to liters conversion table
Common values, rounded to six significant figures.
| gal | 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 |
| 10 gal | 37.8541 L |
| 12 gal | 45.4249 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 |
US gallons appear on fuel receipts, paint tins and chemical drums, and every metric system downstream wants liters. One US gallon is exactly 3.785411784 L. Check which gallon your source meant before converting — the imperial gallon is 4.54609 L, and the two are never marked differently in casual writing.
Values worth remembering
These come up often enough that knowing them saves a lookup.
- 1 gal = 3.78541 Lone US gallon
- 15 gal = 56.7812 La small car fuel tank
Questions people ask
How many liters is 1 US gallon?
1 US gallon is 3.78541 liters.
How many US gallons is 1 liter?
1 liter is 0.264172 US gallons.
How do you convert US gallons to liters in your head?
Use × 3.79. That lands within a percent or so of the exact figure, which is close enough for packing, shipping estimates and shopping — use the calculator when the number has to be right.
Is the US gallon to liter conversion exact?
Yes. The relationship is exact by international agreement, so 3.78541178 is a definition rather than a measurement. Rounding in the answer comes from display, not from the conversion.