How many kilograms are in 1 liter of water?
How many kilograms are in 1 liter of water?
Answer
The density of water is 0.998 kg/L (liquid water at 20 °C; rounding to 1.00 kg/L is fine for everyday use).
How the mass of 1 liter of water was worked out
0.998 kg/L × 1 L
≈1 kg
The density comes from FAO/INFOODS Density Database v2.0. Liquid water at 20 °C; rounding to 1.00 kg/L is fine for everyday use.
Why a liter and a kilogram are not the same thing
A liter measures volume, a kilogram measures mass, and density is what ties them together: how many kilograms one liter of this particular substance comes to. The coincidence that makes people treat them as one thing is historical — in 1795 the gram was defined as the mass of one cubic centimeter of water, so a liter of water weighed a kilogram by construction. For anything else the equality breaks.
The extremes of this page make it obvious: one liter of LPG weighs 0.51 kg, while one liter of densely packed sand weighs 2 kg — four times more at the very same volume.
If the substance is not known in advance, start from how many kilograms are in 1 liter — the same volume across every substance at once.
The other way round: how much room a kilogram takes
This page starts from a volume and answers in kilograms. The opposite question — how many liters a given mass comes to — is what the kilograms to liters calculator is for. Both read the same density table, so the two pages agree wherever the answer is volume times density.
For water that means 1 liter weighs 1 kg here, and one kilogram of it takes 1 liter there.
Related Calculations
See Also
- Kilograms to Liters - How many liters are in a kilogram of water, honey, gasoline, sand and other substances — by density
- L to Ml - Convert Liters to Milliliters
- Sand Calculator - Cubic yards, tons and coverage for any area
- Topsoil Calculator - Cubic yards, weight and coverage for any area
<a href="https://calculat.io/en/volume/l-to-kg/1--water">1 liter of water = 1 kg - Calculatio</a>
How much 1 liter of each substance weighs
| Substance | Mass | Density, kg/L |
|---|---|---|
| Beer | 1.01 kg | 1.01 |
| Cement | 1.25–1.4 kg | 1.25–1.4 |
| Coal | 0.65–1.27 kg | 0.654–1.266 |
| Cucumbers | 0.62–0.64 kg | 0.62–0.64 |
| Diesel | 0.83 kg | 0.834 |
| Gasoline | 0.74 kg | 0.74 |
| Honey | 1.42 kg | 1.42 |
| Juice | 1.06 kg | 1.06 |
| LPG | 0.51 kg | 0.51 |
| Milk | 1.03 kg | 1.03 |
| Mineral spirits | 0.78 kg | 0.78 |
| Motor oil | 0.85 kg | 0.85 |
| Sand | 1.65–2 kg | 1.65–2 |
| Soil | 1.3–1.5 kg | 1.3–1.5 |
| Sugar | 0.72–0.9 kg | 0.72–0.9 |
| Tomatoes | 0.55–0.6 kg | 0.55–0.6 |
| Vegetable oil | 0.92 kg | 0.92 |
| Wall primer | 1 kg | 1 |
| Water | 1 kg | 0.998 |