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What is a liter?

The everyday metric volume unit — 1 cubic decimetre exactly

Definition

The litre is the metric volume unit most used in everyday life. It equals 1 cubic decimetre (0.001 m³) or 1000 ml exactly. Bottled water, petrol, milk and household chemicals are all sold by the litre throughout Europe, Africa and Asia.

Common uses

  • Bottled beverages and milk in Europe
  • Petrol and diesel pricing in metric countries
  • Engine displacement (car engines rated in litres)

🌍 Real-world scale

A standard European petrol-car fuel tank is 50–60 L. A 2.0 L engine has a 2 litre displacement. A typical home boiler holds 150 L of hot water.

Convert from liters

14 conversions
Liter to Milliliter1 L = 1,000 mlLiter to Cubic Meter1 L = 0.001 m³Liter to US Gallon1 L = 0.2642 gal (US)Liter to UK Gallon1 L = 0.22 gal (UK)Liter to Fluid Ounce1 L = 33.814 fl ozLiter to Cup1 L = 4.16667 cupLiter to Pint1 L = 2.11338 ptLiter to Quart1 L = 1.05669 qtLiter to Tablespoon1 L = 67.5676 tbspLiter to Teaspoon1 L = 202.884 tspLiter to Barrel1 L = 0.00629 bblLiter to Cubic Inch1 L = 61.0237 in³Liter to Cubic Foot1 L = 0.03531 ft³Liter to Cubic Yard1 L = 0.001308 yd³

Convert to liters

14 conversions
Milliliter to Liter1 ml = 0.001 LCubic Meter to Liter1 m³ = 1,000 LUS Gallon to Liter1 gal (US) = 3.78541 LUK Gallon to Liter1 gal (UK) = 4.54609 LFluid Ounce to Liter1 fl oz = 0.02957 LCup to Liter1 cup = 0.24 LPint to Liter1 pt = 0.4732 LQuart to Liter1 qt = 0.9464 LTablespoon to Liter1 tbsp = 0.0148 LTeaspoon to Liter1 tsp = 0.004929 LBarrel to Liter1 bbl = 158.987 LCubic Inch to Liter1 in³ = 0.01639 LCubic Foot to Liter1 ft³ = 28.3168 LCubic Yard to Liter1 yd³ = 764.555 L

Tips

  • 1 L = 1000 ml = 1 dm³ = 0.001 m³ exactly.
  • 1 L of water weighs 1 kg at 4 °C — use for quick mass estimates.
  • Fuel economy in Europe is litres per 100 km; lower is better. US uses mpg where higher is better.

Common mistakes

  • Confusing L (litre) with l (lowercase), since lowercase l can be mistaken for digit 1. Capital L is preferred.
  • Mixing litres and US gallons in fuel economy discussions.
  • Writing engine displacement in ml instead of L — 1500 cc = 1.5 L.

FAQ about the liter

What is a liter?
The litre is the metric volume unit most used in everyday life. It equals 1 cubic decimetre (0.001 m³) or 1000 ml exactly. Bottled water, petrol, milk and household chemicals are all sold by the litre throughout Europe, Africa and Asia.
Where is the liter used?
The liter is commonly used for: Bottled beverages and milk in Europe; Petrol and diesel pricing in metric countries; Engine displacement (car engines rated in litres).
What is an example of a liter in real life?
A standard European petrol-car fuel tank is 50–60 L. A 2.0 L engine has a 2 litre displacement. A typical home boiler holds 150 L of hot water.
What category does the liter belong to?
The liter is a unit of volume, part of the 15-unit volume category on UnitConv.
How accurate are liter conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 15 volume units and their conversions.🧪 Volume hub →