1 Gallons to Liters
1 gal ≈ 3.79 L
1 US gallon is approximately 3.79 liters.
How to convert 1 gal to L
Use the formula L = gal × 3.785411784:
L = 1 × 3.785411784L = 3.785412
So 1 gal = 3.785412 L, or about 3.79 L rounded.
Rounded values and quick estimate
- Rounded to a whole number: 4 L
- Rounded to one decimal place: 3.8 L
- Conversion factor: 1 US gallon = 3.79 liters
Quick mental estimate: multiply by 3.8. For 1 gal that gives about 3.8 L — within 1% of the exact answer. Use the exact formula when precision matters.
1 Gallons in other units
One US gallon is exactly 3.785411784 liters. The UK imperial gallon is larger, 4.546 liters.
- Liters
- 3.79 L
- Milliliters
- 3785.41 ml
- Teaspoons
- 768 tsp
- Tablespoons
- 256 tbsp
- US fluid ounces
- 128 fl oz
- US cups
- 16 cups
- US pints
- 8 pt
- US quarts
- 4 qt
- Cubic centimeters
- 3785.41 cc
- Cubic inches
- 231 cu in
- Cubic feet
- 0.1337 cu ft
- Drops
- 75708.24 drops
- Oil barrels
- 0.0238 bbl
- UK gallons
- 0.8327 UK gal
- Cubic meters
- 0.003785 m³
- Cubic yards
- 0.004951 cu yd
1 gal and nearby values
About us gallons and liters
A US gallon is 128 US fluid ounces, exactly 3.785411784 liters. (The UK imperial gallon is 4.546 liters.)
A liter is 1,000 milliliters (one cubic decimeter). It is the standard metric unit for drinks, fuel and containers.
Related conversions
Frequently asked questions
What is 1 Gallons in Liters?
1 US gallon is about 3.79 liters (1 gal ≈ 3.79 L).
How do you convert 1 gal to L?
Apply L = gal × 3.785411784: L = 1 × 3.785411784, L = 3.785412.
How many US gallons is 3.79 L?
3.79 L is about 1 US gallons.
Is a US gallon the same as a UK gallon?
No — a UK gallon is about 20% larger (4.546 L vs 3.785 L).