mL to kg Converter
Milliliters measure volume and kilograms measure mass, so the conversion runs through density. For water it’s simple: 1,000 mL = 1 kg exactly.
Example: with Volume (mL) 500 · Substance Water (1 g/mL) · Custom density (g/mL) 1 → Mass: 0.50 kg.
Computed by the calculator below using its default values. Change any input to see your own numbers.
⚖️ Weigh liquids right with a kitchen scale
Check it outWhy ml to kg depends on the liquid
A milliliter is volume and a kilogram is mass, so the bridge is density: kg = mL × density (g/mL) ÷ 1,000. Water’s density is 1 g/mL, which makes the common cases easy — 500 mL of water is 0.5 kg and 750 mL is 0.75 kg. That 1:1 shortcut only works for water.
Other liquids shift the answer. Milk is slightly denser (1.03 g/mL), so a 1 L carton weighs 1.03 kg. Cooking oil is lighter at 0.92 g/mL — 500 mL is just 0.46 kg, which is why oil floats on water. Honey is heavier still: a 500 mL jar holds 0.71 kg. To go the reverse direction (kg to ml), divide by density instead: 1 kg of honey occupies 1,000 ÷ 1.42 ≈ 704 mL, while 1 kg of gasoline sprawls across about 1,351 mL.
How it’s calculated
Mass (kg) = volume (mL) × density (g/mL) ÷ 1,000. The substance list uses standard reference densities — water 1.00, milk 1.03, cooking oil 0.92, honey 1.42, gasoline 0.74 g/mL — and the custom option accepts any density. Pounds are converted at 1 lb = 0.45359237 kg exactly; the reverse conversion (kg to mL) divides mass in grams by the same density.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Common mistakes
- Assuming 1 mL = 1 g for every liquid — that equality belongs to water alone; oil is 8% lighter, honey 42% heavier.
- Reading a medicine label’s mg/mL as g/mL — that’s a 1,000× error in the density you enter.
- Using liquid logic for dry goods: flour and sugar pack loosely, so their g/mL varies with how they settle.
Frequently asked questions
Is 500 ml equal to 0.5 kg?
For water, yes — 500 mL × 1 g/mL = 500 g = 0.5 kg. The same 500 mL of cooking oil weighs 0.46 kg and of honey 0.71 kg.
How many kg is 750 ml?
For water, 0.75 kg. For milk it's 750 × 1.03 = 772.5 g ≈ 0.77 kg, and for oil about 0.69 kg — density decides.
What is the ml to kg formula?
kg = mL × density in g/mL ÷ 1,000. With density in kg/L the numbers are identical, so 1 L of a 0.92 kg/L oil weighs 0.92 kg.
How do I convert kg back to ml?
Multiply kilograms by 1,000 to get grams, then divide by density. 2 kg of water is 2,000 mL; 2 kg of honey is 2,000 ÷ 1.42 ≈ 1,408 mL.