The density, or more precisely, the volumetric mass density of actinium is 10070 kg/m³. This means that the mass of 1 m³ actinium is 10070 kg.
The weight (on earth) of 1 m³ actinium is 98786,7 N or 98,7867 kN.
Conversion Chart Metric System:
| Kilogram per cubic meter | 10070 | kg/m³ |
| Tonne per cubic meter | 10,07 | t/m³ |
| Gram per cubic meter | 10070000 | g/m³ |
| Milligram per cubic meter | 10070000000 | mg/m³ |
| Kilogram per cubic centimeter | 0,01007 | kg/cm³ |
| Gram per cubic centimeter | 10,07 | g/cm³ |
| Milligram per cubic centimeter | 10070 | mg/cm³ |
| Kilogram per litre | 10,07 | kg/L |
| Gram per litre | 10070 | g/L |
| Milligram per litre | 10070000 | mg/L |
| Kilogram per millilitre | 0,01007 | kg/mL |
| Gram per millilitre | 10,07 | g/mL |
| Milligram per millilitre | 10070 | mg/mL |
Conversion Chart British and U.S.:
| Pound per cubic yard | 16978,02 | lb/yd³ |
| Pound per cubic foot | 628,6701 | lb/ft³ |
| Pound per cubic inch | 0,3638291 | lb/in³ |
| Pound per U.S. gallon | 84,03415 | lb/gal |
| Pound per British gallon | 100,9014 | |
| Pound per U.S. bushel | 782,3383 | |
| Ounce per cubic yard | 271587,9 | oz/yd³ |
| Ounce per cubic foot | 10057,916 | oz/ft³ |
| Ounce per cubic inch | 5,82046 | oz/in³ |
| Ounce per U.S. gallon | 1344,345 | oz/gal |
| Ounce per British gallon | 1615,228 | |
| Ounce per U.S. bushel | 12517,01 |
British Gravitational and English Engineering Units:
| Slug per cubic yard | 527,5673 | slug/yd³ |
| Slug per cubic foot | 19,5358 | slug/ft³ |
| Slug per cubic inch | 0,01130861 | slug/in³ |