litres to kilograms calculator

How to convert litres to kilograms

Converting litres to kilograms is a volume-to-mass conversion. Because litres measure volume and kilograms measure mass, you need one extra piece of information: density.

Formula

kilograms = litres × density (kg/L)

If a liquid has a density of 1.00 kg/L (like water at about room temperature), then 1 litre equals 1 kilogram. For lighter liquids, kilograms will be lower; for heavier liquids, kilograms will be higher.

Quick reference densities

Substance	Typical Density (kg/L)
Water	1.00
Milk	1.03
Vegetable oil	0.92
Gasoline/Petrol	0.74
Honey	1.42
Mercury	13.6

Examples

Example 1: Water

Convert 3 litres of water to kilograms:

• Litres = 3
• Density = 1.00 kg/L
• Mass = 3 × 1.00 = 3 kg

Example 2: Cooking oil

Convert 5 litres of vegetable oil:

• Litres = 5
• Density = 0.92 kg/L
• Mass = 5 × 0.92 = 4.6 kg

Example 3: Honey

Convert 2 litres of honey:

• Litres = 2
• Density = 1.42 kg/L
• Mass = 2 × 1.42 = 2.84 kg

Why 1 litre is not always 1 kilogram

Only for substances with density exactly 1.00 kg/L does 1 litre equal 1 kilogram. Different liquids have different molecular structures, which changes how much mass fits into the same volume. Temperature can also shift density slightly, especially for fuels and industrial liquids.

Tips for accurate results

• Use a density value specific to your liquid and temperature if possible.
• For food and lab use, check product labels or data sheets.
• Round only at the final step to reduce calculation error.
• If your density is in g/mL, the number is the same as kg/L (for example, 0.91 g/mL = 0.91 kg/L).

FAQ

Can I convert litres to kilograms without density?

No. You need density, because litres measure volume and kilograms measure mass.

Is this an l to kg converter for liquids only?

It works best for liquids and pourable materials where density in kg/L is known.

Can I use this for chemicals or fuel?

Yes, as long as you enter the correct density from a trusted source.