18.9271
L
18,927
mL
20
qt
40
pt
80
cups
640
fl oz
18.9271
L
18,927
mL
20
qt
40
pt
80
cups
640
fl oz
The Gallons to Liters Converter converts US gallons to liters using the exact factor 1 US gallon = 3.785411784 liters. This converter is essential for cooking, fuel calculations, international trade, and any application requiring conversion between US customary and metric volume measurements.
The US gallon is defined as exactly 231 cubic inches, which equals 3.785411784 liters. It is used throughout the United States for measuring fuel, milk, water, and other liquids. Most other countries use liters as their standard volume unit.
This tool is particularly useful for expatriates and travelers who need to understand fuel costs (gallons vs liters), home brewers scaling recipes between systems, and industries dealing with bulk liquid shipments internationally.
Results are provided in liters, milliliters, and US cups for maximum versatility.
The exact formula: liters = US gallons × 3.785411784. For milliliters: mL = gallons × 3785.411784. For cups: cups = gallons × 16 (since 1 US gallon = 16 US cups). These are all exact relationships.
Common conversions: 1 gallon = 3.785 L, 5 gallons ≈ 18.9 L, 10 gallons ≈ 37.9 L. A standard water cooler jug holds 5 gallons (18.9 L). The average American uses about 80-100 gallons (300-380 L) of water per day.
Inputs
Results
5-gallon jug = 18.93 liters
Inputs
Results
15 gallons of fuel = 56.78 liters
1 US gallon = 3.785411784 liters exactly.
Multiply the number of US gallons by 3.785411784.
10 US gallons = 37.854 liters.
Yes, significantly. 1 US gallon = 3.785 liters, so a gallon is almost 4 times a liter.
There are exactly 16 US cups in 1 US gallon.
1 US gallon = 3.785 L, 1 imperial (UK) gallon = 4.546 L. The imperial gallon is about 20% larger.
Half a US gallon = 1.893 liters.
Multiply by 3.785. For example, 12 gallons of gas = 45.42 liters.
1 US gallon of milk = 3.785 liters. A half-gallon = 1.893 liters.
About 1.89 two-liter bottles make 1 US gallon (3.785 L ÷ 2 = 1.89).
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