Enter liters or kilograms of water into the calculator to convert to the other using temperature‑dependent density for accuracy.
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Water Liters to Kilograms Formula
The calculator uses a single density relationship and runs it in either direction depending on which unit you enter.
m = V * d
V = m / d
- m = mass in kilograms (kg)
- V = volume in liters (L)
- d = density in kilograms per liter (kg/L)
The Water tab fixes d at 1.000 kg/L, so 1 L of water equals 1 kg. Enter liters and the calculator multiplies by 1 to give kilograms. Enter kilograms and it divides by 1 to give liters.
The Other substance tab lets you pick a density from the list or type your own. If you enter liters, the calculator multiplies by the chosen density to get kilograms. If you enter kilograms, it divides by the density to get liters.
Common Density Values
These are the densities used in the calculator. Real samples vary with temperature, fat content, brand, and how tightly a powder is packed, so treat them as close estimates.
| Substance | Density (kg/L) | 1 L weighs |
|---|---|---|
| Water (4 °C) | 1.000 | 1.000 kg |
| Milk (whole) | 1.030 | 1.030 kg |
| Honey | 1.420 | 1.420 kg |
| Olive oil | 0.920 | 0.920 kg |
| Cooking oil | 0.880 | 0.880 kg |
| Diesel | 0.850 | 0.850 kg |
| Gasoline | 0.740 | 0.740 kg |
| Granulated sugar | 0.850 | 0.850 kg |
| All-purpose flour | 0.530 | 0.530 kg |
Quick Reference for Water
Because water density is 1 kg/L, the conversion is one-to-one at standard conditions.
| Liters | Kilograms | Pounds |
|---|---|---|
| 0.5 L | 0.5 kg | 1.10 lb |
| 1 L | 1 kg | 2.20 lb |
| 5 L | 5 kg | 11.02 lb |
| 10 L | 10 kg | 22.05 lb |
| 20 L | 20 kg | 44.09 lb |
| 50 L | 50 kg | 110.23 lb |
Examples and FAQ
Example 1. You have a 5 L jug of water. Mass = 5 × 1.000 = 5 kg.
Example 2. You have 3 L of olive oil. Mass = 3 × 0.920 = 2.76 kg. The same 3 L of honey would weigh 3 × 1.420 = 4.26 kg.
Does 1 liter of water always equal 1 kilogram? Close, but not exact. Water hits 1.000 kg/L near 4 °C. At 20 °C it drops to about 0.998 kg/L, so 1 L is roughly 998 g. For everyday use, 1 L = 1 kg is fine.
Why does cooking oil weigh less than water? Oils are less dense than water (about 0.88 to 0.92 kg/L), which is also why they float on top of water.
How do I convert kilograms back to liters? Divide the mass by the density: V = m / d. For water that means liters and kilograms share the same number.
What units should I use for density? The calculator expects kg/L. If you have g/mL, the number is the same (1 g/mL = 1 kg/L). If you have kg/m³, divide by 1000 to get kg/L.
