Gallons to Liters Conversion Chart
Reference chart converting US gallons to liters. Covers 0.25 to 50 gallons — essential for fuel, cooking, and international measurement.
For a custom value not in this chart, use the interactive Gallon (US) to Liter converter.
| Gallon (US) (gal) | Liter (L) |
|---|---|
| ¼ gal | 0.946353 L |
| ½ gal | 1.89271 L |
| 1 gal | 3.78541 L |
| 1.5 gal | 5.67812 L |
| 2 gal | 7.57082 L |
| 2.5 gal | 9.46353 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 |
| 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 |
Conversion Formula
liters = gallons × 3.78541 1 US gallon = 3.78541 liters (exact) UK/Imperial gallon = 4.54609 liters (20% larger) Quick estimate: multiply gallons by 3.8 (within 0.4%) Key reference values: 1 gal = 3.785 L 5 gal = 18.927 L (standard water jug) 10 gal = 37.854 L 15 gal = 56.781 L (typical small car fuel tank) 20 gal = 75.708 L Vehicle fuel tanks: Small car (e.g., Honda Civic): 12–14 gal = 45–53 L Midsize sedan: 15–18 gal = 57–68 L SUV: 18–22 gal = 68–83 L Aquariums: 10 gal = 37.9 L (starter tank) 20 gal = 75.7 L (common community tank) 55 gal = 208.2 L (large display tank)
Frequently Asked Questions
How many liters is 1 gallon?
1 US gallon equals exactly 3.78541 liters. A quick mental estimate: multiply gallons by 3.8 to get liters within 0.4%.
How many liters is 5 gallons?
5 US gallons equals approximately 18.93 liters. A standard 5-gallon water jug holds just under 19 liters — useful to know when buying bottled water in metric countries.
How many liters is 10 gallons?
10 US gallons equals approximately 37.85 liters. If you're calculating fuel for a generator or tank, 10 gallons ≈ 38 liters is a handy reference.
How many liters is 15 gallons?
15 × 3.78541 = 56.78 liters — a typical small-car fuel tank size. Many compact cars have 12–14 gallon tanks, so a full tank is roughly 45–53 liters.
How many liters is a 55-gallon drum?
55 × 3.78541 = 208.2 liters. A 55-gallon drum is a standard aquarium display size and common industrial container. Also used as a reference: '55-gallon' is the standard large aquarium tank designation.
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This chart covers common values. For any number, use the interactive converter.
Use the interactive converter →All conversion values are calculated using internationally recognized conversion factors. Results are provided for general informational purposes — verify critical values independently. Read our full disclaimer.