mL to kg Calculator — Millilitres to Kilograms
Convert a volume in millilitres (mL) to mass in kilograms (kg): pick your substance from the preset list — water, milk, oil, honey and more — or enter a custom density, and get the mass in kg, grams, ounces and pounds instantly.
mL
Substance
kg = mL × Density (g/mL) ÷ 1000
- 1
Volume × density → grams
100 mL × 1 g/mL = 100 - 2
Grams ÷ 1,000 → kilograms
100 ÷ 1000 = 0.100000Divide grams by 1,000 to convert to kilograms.
How does this calculator work?
Mass (kg) = Volume (mL) × Density (g/mL) ÷ 1000. Water (1 g/mL): 100 mL = 0.1 kg. Honey (≈1.42 g/mL): 100 mL ≈ 0.142 kg. Ethanol (0.789 g/mL): 100 mL ≈ 0.079 kg. Pick a substance preset or enter a custom density for any liquid.
Formula
How this is calculated
Millilitres measure volume and kilograms measure mass — they are not directly interchangeable without knowing the density of the substance. Density (ρ) is mass per unit volume: ρ = m ÷ V, expressed in g/mL (which equals g/cm³ = kg/L). Rearranging gives mass = volume × density, then dividing by 1 000 converts grams to kilograms.
For water at about 20 °C, density ≈ 1.000 g/mL, so 1 mL of water weighs almost exactly 1 g = 0.001 kg. For denser liquids like mercury (13.534 g/mL) or honey (~1.42 g/mL), the mass is proportionally higher; for lighter liquids like ethanol (0.789 g/mL) or gasoline (~0.737 g/mL) it is lower. All preset densities are typical values at approximately 20 °C and atmospheric pressure.
If you have a liquid not in the preset list, enter its density from a material data sheet (SDS/MSDS) or chemistry reference in g/mL. Note that density varies slightly with temperature and pressure — for most practical purposes, room-temperature values are accurate to within a few tenths of a percent. For highly precise work in science or industry, always consult a traceable reference for the exact conditions of your application.
Frequently asked questions
1 000 mL of water (one litre) weighs almost exactly 1 kg at room temperature, because the density of water is approximately 1.000 g/mL. For other liquids, the answer differs: 1 000 mL of honey weighs about 1.42 kg, while 1 000 mL of ethanol weighs about 0.789 kg.
Only if you assume the liquid is water (density ≈ 1 g/mL), in which case mL and grams are numerically equal and 1 mL = 0.001 kg. For any other substance you must know its density to convert a volume to a mass. Use the Custom density field if you have a precise value from a datasheet.
The calculator shows up to six decimal places because small volumes produce very small masses — for example, 1 mL of water = 0.001 000 kg. You can round to the number of significant figures appropriate for your application.
Also known as
TG we-Calculate Editorial Team. (2026). mL to kg Calculator — Millilitres to Kilograms [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/ml-to-kg-calculator
TG we-Calculate Editorial Team. "mL to kg Calculator — Millilitres to Kilograms." TG we-Calculate. 2026. https://we-calculate.com/calculator/ml-to-kg-calculator.
TG we-Calculate Editorial Team, "mL to kg Calculator — Millilitres to Kilograms," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/ml-to-kg-calculator
@misc{wecalculate_ml_to_kg_calculator, title = {mL to kg Calculator — Millilitres to Kilograms}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/ml-to-kg-calculator}}, year = {2026}, note = {TG we-Calculate} }
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