Cubic Centimeters to Kilograms (cc, cm³ to kg)
One cubic centimeter (cm³ or cc) of water weighs 0.001 kg, so 1,000 cm³ of water is exactly 1 kilogram. For other liquids the answer depends on density. This calculator converts cubic centimeters to kilograms for water and 18 common liquids, and can work from a box or cube’s length, width and height in centimeters.
How to Convert Cubic Centimeters to Kilograms
Cubic centimeters measure volume and kilograms measure mass, so the conversion needs the liquid's density, which is how many grams one cubic centimeter weighs. Multiply by the density to get grams, then divide by 1,000 to get kilograms:
kilograms = cubic centimeters x density (g/cm³) / 1,000
Worked example: 500 cc of milk, at a density of 1.03 g/cm³, weighs 500 × 1.03 = 515 grams, which is 0.515 kg. The same 500 cc of water weighs exactly 0.5 kg, because water's density is 1 g/cm³. That is why the quick rule "1,000 cm³ = 1 kg" holds for water and only approximately for anything else.
To go the other way, from kilograms back to cubic centimeters, reverse it: cm³ = kg × 1,000 ÷ density. One kilogram of milk takes up about 971 cm³.
From Box Dimensions to Kilograms
If you know the size of a container rather than its volume, multiply the three inside measurements in centimeters to get cubic centimeters first, then apply the formula above. Choose "Box or cube dimensions" in the calculator to do both steps at once.
A 10 cm cube is the easiest case to remember: 10 × 10 × 10 = 1,000 cm³, which is one liter, and a liter of water weighs 1 kg. This is no coincidence. When the metric system was set up in the 1790s, the kilogram was defined as the mass of exactly that cube of water. A 15 cm cube holds 3,375 cm³, so filled with water it weighs 3.375 kg.
| Cube size | Volume | Water (kg) | Water (lb) |
|---|---|---|---|
| 1 cm cube | 1 cm³ | 0.001 kg | 0.0022 lb |
| 5 cm cube | 125 cm³ | 0.125 kg | 0.276 lb |
| 10 cm cube | 1,000 cm³ | 1 kg | 2.205 lb |
| 15 cm cube | 3,375 cm³ | 3.375 kg | 7.441 lb |
| 20 cm cube | 8,000 cm³ | 8 kg | 17.637 lb |
| 25 cm cube | 15,625 cm³ | 15.625 kg | 34.447 lb |
| 30 cm cube | 27,000 cm³ | 27 kg | 59.525 lb |
| 50 cm cube | 125,000 cm³ | 125 kg | 275.578 lb |
Notice how fast weight climbs with size. Doubling each side of a cube multiplies its volume, and therefore its weight, by eight. A small aquarium measuring 30 × 20 × 20 cm holds 12,000 cm³, or 12 kg of water, before you add the glass, gravel and stand.
CC to KG Conversion Chart
Common amounts in cubic centimeters converted to kilograms for water and three liquids that differ from it:
| Cubic centimeters | Water | Milk | Vegetable Oil | Honey |
|---|---|---|---|---|
| 1 cm³ | 0.001 kg | 0.00103 kg | 0.00092 kg | 0.00142 kg |
| 10 cm³ | 0.01 kg | 0.0103 kg | 0.0092 kg | 0.0142 kg |
| 50 cm³ | 0.05 kg | 0.0515 kg | 0.046 kg | 0.071 kg |
| 100 cm³ | 0.1 kg | 0.103 kg | 0.092 kg | 0.142 kg |
| 250 cm³ | 0.25 kg | 0.2575 kg | 0.23 kg | 0.355 kg |
| 500 cm³ | 0.5 kg | 0.515 kg | 0.46 kg | 0.71 kg |
| 750 cm³ | 0.75 kg | 0.7725 kg | 0.69 kg | 1.065 kg |
| 1,000 cm³ | 1 kg | 1.03 kg | 0.92 kg | 1.42 kg |
| 2,000 cm³ | 2 kg | 2.06 kg | 1.84 kg | 2.84 kg |
| 5,000 cm³ | 5 kg | 5.15 kg | 4.6 kg | 7.1 kg |
| 10,000 cm³ | 10 kg | 10.3 kg | 9.2 kg | 14.2 kg |
Can You Convert cm to kg?
Not directly. A centimeter (cm) measures length, while a cubic centimeter (cm³) measures volume, and only volume can be turned into weight. A search for a "cm to kg converter" usually means one of two things:
- The size of a cube or box. "10 cm to kg" most often means a 10 cm cube, which is 1,000 cm³ and holds 1 kg of water. Use the dimensions mode above for any shape of box.
- Height and body weight. There is no formula that turns a person's height in centimeters into kilograms. Height and weight are separate measurements that you can only compare against each other, for example on a growth chart.
From cm³ to kg to lbs
To get pounds, convert to kilograms first and multiply by 2.2046. So 1,000 cm³ of water is 1 kg, or 2.2 lb, and 500 cm³ of water is 0.5 kg, or 1.1 lb. The calculator shows grams, kilograms and pounds together, so you can read off whichever you need. For larger volumes, the liters to pounds converter saves a step.
cc, cm³, cm3 and cu cm: Same Unit
All of these name the same volume: a cube one centimeter on each side. Science uses cm³, medicine and engines use cc, "cm3" is how cm³ gets typed without a superscript, and "cu cm" appears on older American labels. A milliliter is exactly the same volume too, so 1 cc = 1 cm³ = 1 mL, and every result on this page applies to milliliters unchanged.
Common Questions
How many kg is 1000 cm3?
1,000 cm³ of water weighs exactly 1 kg, because 1,000 cm³ is one liter. Other liquids differ: 1,000 cm³ of vegetable oil weighs 0.92 kg and 1,000 cm³ of honey weighs 1.42 kg.
What is 100 cc in kg?
100 cc of water is 0.1 kg, or 100 grams. 100 cc of milk is 0.103 kg, and 100 cc of olive oil is about 0.091 kg.
How many kg is 500 cc?
500 cc of water weighs 0.5 kg, about 1.1 lb. A half-liter bottle of drink holds 500 cc and weighs a little over 0.5 kg once you count the bottle.
Does 1 cm³ always weigh 1 gram?
Only for water. One cubic centimeter of any substance weighs its density in grams: 0.92 g for vegetable oil, 1.42 g for honey, and 13.5 g for mercury. That is why the calculator asks which liquid you are measuring.
How do I convert kg to cubic centimeters?
Multiply the kilograms by 1,000 to get grams, then divide by the density. For water, 2 kg is 2,000 cm³. For honey, the same 2 kg fills only about 1,408 cm³, because honey is denser. Use the swap button in the calculator to convert in this direction.
Densities follow our methodology, with water at 1.0 g/cm³. Real liquids vary slightly with temperature and brand. Written by Shah Nasar. Last updated October 2026.