The density, or more precisely, the volumetric mass density of columbium is 8600 kg/m³. This means that the mass of 1 m³ columbium is 8600 kg.
The weight (on earth) of 1 m³ columbium is 84366 N or 84,366 kN.
Conversion Chart Metric System:
| Kilogram per cubic meter | 8600 | kg/m³ |
| Tonne per cubic meter | 8,6 | t/m³ |
| Gram per cubic meter | 8600000 | g/m³ |
| Milligram per cubic meter | 8600000000 | mg/m³ |
| Kilogram per cubic centimeter | 0,0086 | kg/cm³ |
| Gram per cubic centimeter | 8,6 | g/cm³ |
| Milligram per cubic centimeter | 8600 | mg/cm³ |
| Kilogram per litre | 8,6 | kg/L |
| Gram per litre | 8600 | g/L |
| Milligram per litre | 8600000 | mg/L |
| Kilogram per millilitre | 0,0086 | kg/mL |
| Gram per millilitre | 8,6 | g/mL |
| Milligram per millilitre | 8600 | mg/mL |
Conversion Chart British and U.S.:
| Pound per cubic yard | 14499,6 | lb/yd³ |
| Pound per cubic foot | 536,898 | lb/ft³ |
| Pound per cubic inch | 0,310718 | lb/in³ |
| Pound per U.S. gallon | 71,767 | lb/gal |
| Pound per British gallon | 86,172 | |
| Pound per U.S. bushel | 668,134 | |
| Ounce per cubic yard | 231942 | oz/yd³ |
| Ounce per cubic foot | 8589,68 | oz/ft³ |
| Ounce per cubic inch | 4,9708 | oz/in³ |
| Ounce per U.S. gallon | 1148,1 | oz/gal |
| Ounce per British gallon | 1379,44 | |
| Ounce per U.S. bushel | 10689,8 |
British Gravitational and English Engineering Units:
| Slug per cubic yard | 450,554 | slug/yd³ |
| Slug per cubic foot | 16,684 | slug/ft³ |
| Slug per cubic inch | 0,0096578 | slug/in³ |