How to Convert Gallons to Liters
Our free Gallons to Liters converter lets you instantly convert volumes in both directions — no sign-up, no downloads, and 100% private since everything runs in your browser. Whether you're checking fuel efficiency (MPG vs L/100km), filling an aquarium, mixing chemicals, or working with international recipes, this tool gives you instant accurate results with bonus conversions to quarts, pints, cups, and fluid ounces.
Why Use UtilDaily's Gallons to Liters Converter?
Our Gallons to Liters converter is designed for accuracy and ease of use. Whether you're comparing fuel economy ratings, calculating aquarium capacity, or working with recipes from different countries, you'll find everything you need in one place.
- Instant bidirectional conversion between US gallons and liters — type in either field and the other updates automatically
- Exact NIST-defined conversion (3.785411784 L per US gallon) — no rounding errors
- 100% private and free — everything runs in your browser with no data sent to any server, no sign-up, and no limits
- Common reference tables for fuel tanks, aquariums, water heaters, and hot tubs
- Bonus conversions to quarts, pints, cups, fluid ounces, and milliliters
- Click-to-load common values in the reference table
Frequently Asked Questions
How many liters are in 1 US gallon?
1 US liquid gallon equals exactly 3.785411784 liters. This is defined by NIST and is used in the United States for fuel, milk, and other liquid measurements. So: 1 gal = 3.785 L, 2 gal = 7.571 L, 5 gal = 18.927 L, 10 gal = 37.854 L, 20 gal = 75.708 L, 50 gal = 189.271 L, 100 gal = 378.541 L.
How many liters is a US gallon vs UK (imperial) gallon?
A US liquid gallon is 3.785411784 liters, while a UK (imperial) gallon is 4.54609 liters. The UK gallon is about 20% larger. Our calculator uses the US gallon (most common in international contexts, especially for fuel efficiency and beverages). For UK gallons, multiply liters by 0.219969 instead.
How many liters is 5 gallons?
5 US gallons = 18.927 L. This is the standard home aquarium size. Other common aquarium sizes: 10 gal = 37.85 L, 20 gal = 75.71 L, 29 gal = 109.78 L, 55 gal = 208.20 L, 75 gal = 283.91 L, 100 gal = 378.54 L.
How many liters is 1 gallon of water?
1 gallon of water = 3.7854 L = 3.7854 kg (since water density is 1 kg/L at 4°C). So 5 gallons of water weighs about 18.93 kg, 10 gallons weighs 37.85 kg, and 50 gallons weighs 189.27 kg.
How many gallons is a 60-liter fuel tank?
A 60-liter fuel tank = 15.85 US gallons. Common fuel tank sizes in liters: 35 L = 9.25 gal (small car), 45 L = 11.89 gal (sedan), 60 L = 15.85 gal (mid-size), 80 L = 21.13 gal (large SUV), 100 L = 26.42 gal (truck).
How do I convert MPG to L/100 km?
To convert MPG (US) to L/100 km: divide 235.215 by the MPG value. For example: 30 MPG = 7.84 L/100km, 25 MPG = 9.41 L/100km, 20 MPG = 11.76 L/100km, 40 MPG = 5.88 L/100km. Our tool converts volume, but the conversion factor between gallons and liters (3.7854) is the key step.
How many gallons is 20 liters?
20 liters = 5.283 US gallons. Common references: 1 L = 0.264 gal, 2 L = 0.528 gal, 4 L = 1.057 gal, 5 L = 1.321 gal, 10 L = 2.642 gal, 20 L = 5.283 gal, 50 L = 13.21 gal, 100 L = 26.42 gal.
How big is a 100-gallon tank?
A 100-gallon tank = 378.54 L = 852.3 lbs of water (when full). Common 100-gallon applications: residential hot tub (fits 2-4 people), rainwater collection barrel, large fish pond. A 100-gallon tank typically measures 4-5 feet in length and 2 feet in diameter, depending on the shape.
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