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Gallons to Liters Converter — Vehicle Fuel Tanks & Home Aquariums

Converting US gallons (gal) to liters (L) is a daily necessity for motorists traveling abroad, marine aquarium hobbyists, and international logistics planners. When renting a car in Europe or Canada, filling a 15-gallon gas tank requires approximately 56.8 liters at the fuel pump. Multiplying US liquid gallons by 3.785411784 yields exact liters.

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Volume Standard

gal
⇌
L
Quick Fill:

Price Guard Analytics

Live Comparison

Compare fluid costs to find the best value across unit systems. Perfect for cross-border fuel calculations.

$/gal
⇌
$/L
Smart Jug Visualizer
1 gal
1.00 gallons
5 L
3.79 L
Vessel Viewport
Standard 1-Gallon Milk Jug

Conversion Formula

1 US Gallon = 3.78541 Liters
Gallons1 gal
Multiplier× 3.78541
Total Liters3.7854 L

Volume Standards History

US CustomaryBased on English wine gallon (231 in³)
Imperial (UK)Based on 10 lbs of water at 62°F
VarianceUK is ~20% larger than US

Conversion Reference Table

GallonsUS LitersImperial Liters
0.25 gal0.946 L1.137 L
0.5 gal1.893 L2.273 L
1 gal3.785 L4.546 L
2 gal7.571 L9.092 L
3 gal11.356 L13.638 L
4 gal15.142 L18.184 L
5 gal18.927 L22.73 L
10 gal37.854 L45.461 L
15 gal56.781 L68.191 L
20 gal75.708 L90.922 L
50 gal189.27 L227.305 L
100 gal378.541 L454.609 L

Overview & Capabilities

Converting US gallons (gal) to liters (L) is a daily necessity for motorists traveling abroad, marine aquarium hobbyists, and international logistics planners. When renting a car in Europe or Canada, filling a 15-gallon gas tank requires approximately 56.8 liters at the fuel pump. Multiplying US liquid gallons by 3.785411784 yields exact liters.

Tutorial

How to Use

01
Enter the liquid volume in US Gallons (gal).
02
The engine multiplies by 3.7854118 to compute exact Liters (L).
03
Review automotive and aquarium presets (5 gal carboy, 12 gal sedan tank, 55 gal drum, 75 gal reef tank).
04
Export the liter volume for fuel cost calculations or water treatment dosing.
Capabilities

Key Features

US Liquid Gallon precision multiplier (1 gal = 3.785411784 L)
Automotive & Tank Presets: 1 gal (3.79 L milk), 5 gal (18.9 L water jug), 15 gal (56.8 L gas tank), 55 gal (208.2 L oil drum)
Fuel economy and fuel cost conversion guidance
Instant responsive output
Applications

Common Use Cases

International Road Trips: Convert a 14-gallon fuel fill-up into 53.0 liters when driving in Canada or Mexico.
Reef Aquariums: Calculate exact water change volumes in liters for a 55-gallon marine fish tank.
Paint & Coatings: Translate 5-gallon commercial paint buckets into 18.9 liters for industrial coverage.
Guidance

Tips & Best Practices

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Quick mental estimate: Multiply gallons by 4 and subtract roughly 5% (e.g. 10 gal × 4 = 40 - 2 = 38 L, exact is 37.85 L).
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1 US liquid gallon equals exactly 3.78541 liters.
Ecosystem

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Answers

Frequently Asked Questions

Q What is 1 gallon in liters?

1 US gallon equals exactly 3.78541 liters (approx 3.79 L).

Q What is 5 gallons in liters?

5 US gallons equals 18.93 liters.

Q What is 15 gallons in liters?

15 gallons (typical compact car gas tank) equals 56.78 liters.

Q What is a 55-gallon drum in liters?

A 55-gallon drum holds 208.20 liters of liquid.