Gallons to Liters

Convert US gallons to liters. 1 US gallon = 3.78541 liters.

About This Calculator

Convert US gallons to liters. 1 US gallon = 3.78541 liters. Use the calculator above for instant results.

Worked Examples

Example 1: 10 gallons

  • 10 × 3.78541 = 37.85 liters

Answer: 37.85 L

Example 2: 1 gallon

  • 3.78541 liters | Standard US gallon

Answer: 3.785 L

Example 3: Gas tank: 15 gallons

  • 15 × 3.785 = 56.78 liters

Answer: 56.78 L

Who Uses This Calculator?

⛽️
Drivers

Convert tank size for international travel.

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Home Cooks

Convert recipe liquid measurements.

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Scientists

Fluid volume unit conversion.

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Travelers

Understand fuel prices abroad.

Common Mistakes to Avoid

❌ US vs Imperial gallon

US gallon = 3.785 L. UK imperial gallon = 4.546 L. Very different! US fuel economy (mpg) uses US gallons.

❌ Liters vs milliliters

1 liter = 1000 mL. A standard water bottle is 500 mL = 0.5 L.

Frequently Asked Questions

Gallons to liters?

Multiply by 3.78541. 1 gallon = 3.785 L.

Liters to gallons?

Divide by 3.78541. 1 L = 0.2642 gallons.

Fuel economy: L/100km vs mpg?

Divide 235.21 by mpg to get L/100km. 30 mpg = 7.84 L/100km.