Back to Volume

gallon (gal) → liter (L)

Instant conversion - enter value to see result

Use our free online converter to convert between units instantly. Enter any value in the field above to get accurate results. No signup or download required—all conversions run in your browser. Our calculator uses standard conversion factors for reliability.

0
gal=L
0.01=0.037854
0.1=0.378541
1=3.78541
2=7.57082
3=11.35623
5=18.92705
10=37.8541
20=75.7082
50=189.2705
100=378.541
1000=3,785.41

Popular conversions

More conversions in this category

Brief explanation: gallon to liter

Liter is the base volume unit in the metric system. US gallon = 3.78 L. Cup = 236 ml. Tablespoon = 15 ml, teaspoon = 5 ml. Volume measures how much space a substance occupies. The metric system (L, mL) is used worldwide. US customary units (gal, cup, tbsp, tsp) are common in American recipes. When converting, use the exact factors for accuracy—especially in cooking and chemistry.

Related converters

Common conversion examples: gallon to liter

Reference values for quick comparison. Use the converter above for any amount.

  • 1 gallon=3.7854 liter
  • 5 gallon=18.9271 liter
  • 10 gallon=37.8541 liter

About the Units

gallon (gal)

Definition: A gallon (gal) is a unit of volume. The US gallon equals 3.785 liters; the imperial (UK) gallon equals 4.546 liters. It is used for fuel, milk, and other liquids in the US and UK.
History: The gallon has medieval English origins. The US and imperial gallons diverged. The US gallon is based on the wine gallon; the imperial gallon was defined in 1824 for the British Empire.
Current use: Gallons are used for fuel efficiency (mpg), milk, and paint in the US. The UK uses imperial gallons for fuel. Most countries use liters for liquid volumes.

liter (L)

Definition: A liter (L) is a unit of volume equal to one cubic decimeter. One liter of water has a mass of approximately one kilogram at 4°C. It is the standard metric unit for liquid volume.
History: The liter was introduced in France in 1795 as the volume of a cube with 10 cm sides. It was originally called the cadet. The liter is now defined as exactly one cubic decimeter.
Current use: Liters are used for beverages, fuel, and liquid volumes worldwide. Car engine displacement, beverage bottles, and fuel efficiency (e.g., L/100 km) use liters. The US uses gallons for fuel.

Sources

Liters and gallons are used for fuel, beverages, and liquids. Use this when comparing fuel economy (L/100 km vs mpg), recipe volumes, or tank sizes. 1 US gallon ≈ 3.785 L.

Conversion factors and unit definitions follow international standards. For authoritative references, see: