How to Convert Gallons to Liters

Volume: US gallons ↔ liters. (UK gallons differ slightly.)

The formula (US gallon)

1 US gallon = 3.785411784 L (often rounded to 3.785). So:

liters = US gallons × 3.785

To go from liters to US gallons: gallons = liters ÷ 3.785 (or multiply by ~0.264).

Examples

• 1 US gal ≈ 3.79 L
• 5 gal ≈ 18.93 L
• 20 L ≈ 5.28 US gal

US vs UK gallon

1 UK (imperial) gallon ≈ 4.546 L. If you’re in the UK or using imperial units, use the UK gallon factor. tounits.com supports both when you select the unit.

On tounits.com

Type 10 gallons or 40 liters to convert. Try it.