Gallons to Liters Converter
1 US gallon = 3.785 liters
1 Gallon =
3.785
liters (L)
Exact: 1 US gal = 3.785411784 L
5 gal18.927 L
10 gal37.854 L
20 gal75.708 L
100 gal378.54 L
gal =L
How to Convert Gallons to Liters
Liters = Gallons × 3.785411784
1 US gallon = 3.785411784 liters (exact, defined since 1959)
Gallons = Liters × 0.264172
To convert liters back to US gallons
1 gallon in liters3.785 L
5 gallons in liters18.927 L
10 gallons in liters37.854 L
1 liter in gallons0.264172 gal
Quick estimate: 1 US gallon ≈ 3.8 liters. For gas station math: multiply gallons by 3.8 for a close approximation. The exact factor is 3.785411784.
Gallons to Liters Reference Table
| Gallons (gal) | Liters (L) | Quarts |
|---|---|---|
| 0.5 gal | 1.893 L | 2 qt |
| 1 gal | 3.785 L | 4 qt |
| 1.5 gal | 5.678 L | 6 qt |
| 2 gal | 7.571 L | 8 qt |
| 2.5 gal | 9.464 L | 10 qt |
| 3 gal | 11.356 L | 12 qt |
| 4 gal | 15.141 L | 16 qt |
| 5 gal | 18.927 L | 20 qt |
| 6 gal | 22.712 L | 24 qt |
| 7 gal | 26.498 L | 28 qt |
| 8 gal | 30.283 L | 32 qt |
| 9 gal | 34.069 L | 36 qt |
| 10 gal | 37.854 L | 40 qt |
| 15 gal | 56.781 L | 60 qt |
| 20 gal | 75.708 L | 80 qt |
| 25 gal | 94.635 L | 100 qt |
| 30 gal | 113.562 L | 120 qt |
| 50 gal | 189.271 L | 200 qt |
| 100 gal | 378.541 L | 400 qt |
Frequently Asked Questions
How many liters in a gallon?
1 US gallon = 3.785411784 liters exactly. For everyday use: 1 gallon ≈ 3.785 liters or approximately 3.8 liters.
How many liters is 5 gallons?
5 gallons = 18.927 liters. Multiply 5 × 3.785411784 = 18.927 liters. A standard 5-gallon water jug holds about 18.9 liters.
US gallon vs UK gallon — what's the difference?
US gallon = 3.785 liters. UK imperial gallon = 4.546 liters. The UK gallon is about 20% larger. Always specify which gallon you mean for international contexts.
How many gallons is 40 liters?
40 liters = 10.567 US gallons. Divide by 3.785411784: 40 ÷ 3.785 = 10.567 gallons.