A liter is a unit of volume equal to 1,000 milliliters or 1 cubic decimeter, which is the same as 0.001 cubic meters. It’s a standard metric measure used for liquids like water, milk, fuel, and soft drinks.

Quick Scoop: What a Liter Really Is

  • 1 liter = 1,000 milliliters (ml).
  • 1 liter ≈ 4.23 US cups.
  • 1 liter ≈ 33.8 US fluid ounces.
  • 1 liter ≈ 0.264 US gallons.
  • In everyday life, a typical big water bottle or soda bottle is often around 1 liter in size.

In practical terms, if you imagine a standard large drink bottle or a full medium-sized kitchen jug, that’s about one liter of liquid.

If you meant “how much does 1 liter of water cost,” that varies a lot by country and by whether it’s tap or bottled water, but bottled water is often somewhere between a few cents and a couple of dollars per liter in many places.