Gallons to Liters Converter

Volume conversion between gallons and liters is essential for fuel calculations, cooking, home brewing, and automotive work. Our gallons to liters converter provides instant, accurate conversions with clear explanations of the conversion process.

US Gallons to Liters Formula

To convert US gallons to liters, use the formula:

L = gal × 3.78541

Multiply the volume in US gallons by 3.78541 to get the volume in liters. This conversion factor is based on the exact definition that 1 US gallon equals 3.785411784 liters. For example, 10 gallons = 10 × 3.78541 = 37.85 liters.

Liters to US Gallons Formula

To convert liters to US gallons, use the formula:

gal = L ÷ 3.78541 (or L × 0.264172)

Divide the volume in liters by 3.78541 (or multiply by 0.264172) to get the volume in US gallons. This is the exact inverse of the gallons to liters conversion. For example, 20 liters = 20 ÷ 3.78541 = 5.28 gallons.

Key Volume References

• • 1 US gallon: 3.78541 liters (approximately 3.8 L)
• • 1 liter: 0.264172 US gallons (approximately 0.26 gal or 1 quart)
• • 1 quart: 0.946353 liters (4 quarts = 1 gallon)
• • Gas tank (small car): 40-50 liters = 10.5-13 gallons
• • Gas tank (average car): 60-70 liters = 15.8-18.5 gallons

Practical Applications

• • Fuel Calculations: Convert gas tank capacity and fuel consumption
• • Cooking & Recipes: Convert liquid ingredients in international recipes
• • Home Brewing: Convert recipe volumes for beer and wine making
• • Automotive Work: Convert fluid capacities (oil, coolant, etc.)
• • Pool Maintenance: Convert water volume for chemical calculations

Quick Conversion Tips

• • For a rough gal to L estimate: Multiply gallons by 4 (slightly high)
• • For a rough L to gal estimate: Divide liters by 4 (slightly low)
• • Remember: 1 gallon ≈ 3.8 liters (easy approximation)
• • For precision, always use the exact factor: 3.78541
• • 1 liter is about 1 quart (actually slightly more)

US Gallons vs UK/Imperial Gallons

It's important to note that US gallons and UK (Imperial) gallons are different. 1 US gallon equals 3.78541 liters, while 1 UK gallon equals 4.54609 liters. The UK gallon is about 20% larger than the US gallon. This calculator uses US gallons, which are standard in the United States. If you're working with UK gallons, you'll need to use a different conversion factor.

Fuel Efficiency Conversions

Fuel efficiency is measured in miles per gallon (mpg) in the US and liters per 100 kilometers (L/100km) in most other countries. To convert: mpg to L/100km ≈ 235 ÷ mpg. For example, 30 mpg ≈ 7.8 L/100km. This helps when comparing vehicle fuel efficiency across different measurement systems.

Metric vs Imperial System

Liters are part of the metric system (SI units), used by most countries worldwide and in all scientific contexts. Gallons are part of the imperial system, still commonly used in the United States for liquid measurements. In international trade and science, liters are the standard unit. However, US consumers are most familiar with gallons for fuel, milk, and other common liquids.