The density, or more precisely, the volumetric mass density of cobalt is 8900 kg/m³. This means that the mass of 1 m³ cobalt is 8900 kg.
The weight (on earth) of 1 m³ cobalt is 87309 N or 87,309 kN.
Conversion Chart Metric System:
| Kilogram per cubic meter | 8900 | kg/m³ |
| Tonne per cubic meter | 8,9 | t/m³ |
| Gram per cubic meter | 8900000 | g/m³ |
| Milligram per cubic meter | 8900000000 | mg/m³ |
| Kilogram per cubic centimeter | 0,0089 | kg/cm³ |
| Gram per cubic centimeter | 8,9 | g/cm³ |
| Milligram per cubic centimeter | 8900 | mg/cm³ |
| Kilogram per litre | 8,9 | kg/L |
| Gram per litre | 8900 | g/L |
| Milligram per litre | 8900000 | mg/L |
| Kilogram per millilitre | 0,0089 | kg/mL |
| Gram per millilitre | 8,9 | g/mL |
| Milligram per millilitre | 8900 | mg/mL |
Conversion Chart British and U.S.:
| Pound per cubic yard | 15005,4 | lb/yd³ |
| Pound per cubic foot | 555,627 | lb/ft³ |
| Pound per cubic inch | 0,321557 | lb/in³ |
| Pound per U.S. gallon | 74,2705 | lb/gal |
| Pound per British gallon | 89,178 | |
| Pound per U.S. bushel | 691,441 | |
| Ounce per cubic yard | 240033 | oz/yd³ |
| Ounce per cubic foot | 8889,32 | oz/ft³ |
| Ounce per cubic inch | 5,1442 | oz/in³ |
| Ounce per U.S. gallon | 1188,15 | oz/gal |
| Ounce per British gallon | 1427,56 | |
| Ounce per U.S. bushel | 11062,7 |
British Gravitational and English Engineering Units:
| Slug per cubic yard | 466,271 | slug/yd³ |
| Slug per cubic foot | 17,266 | slug/ft³ |
| Slug per cubic inch | 0,0099947 | slug/in³ |