The density, or more precisely, the volumetric mass density of thallium is 11850 kg/m³. This means that the mass of 1 m³ thallium is 11850 kg.
The weight (on earth) of 1 m³ thallium is 116248,5 N or 116,2485 kN.
Conversion Chart Metric System:
| Kilogram per cubic meter | 11850 | kg/m³ |
| Tonne per cubic meter | 11,85 | t/m³ |
| Gram per cubic meter | 11850000 | g/m³ |
| Milligram per cubic meter | 11850000000 | mg/m³ |
| Kilogram per cubic centimeter | 0,01185 | kg/cm³ |
| Gram per cubic centimeter | 11,85 | g/cm³ |
| Milligram per cubic centimeter | 11850 | mg/cm³ |
| Kilogram per litre | 11,85 | kg/L |
| Gram per litre | 11850 | g/L |
| Milligram per litre | 11850000 | mg/L |
| Kilogram per millilitre | 0,01185 | kg/mL |
| Gram per millilitre | 11,85 | g/mL |
| Milligram per millilitre | 11850 | mg/mL |
Conversion Chart British and U.S.:
| Pound per cubic yard | 19979,1 | lb/yd³ |
| Pound per cubic foot | 739,7955 | lb/ft³ |
| Pound per cubic inch | 0,4281405 | lb/in³ |
| Pound per U.S. gallon | 98,88825 | lb/gal |
| Pound per British gallon | 118,737 | |
| Pound per U.S. bushel | 920,6265 | |
| Ounce per cubic yard | 319594,5 | oz/yd³ |
| Ounce per cubic foot | 11835,78 | oz/ft³ |
| Ounce per cubic inch | 6,8493 | oz/in³ |
| Ounce per U.S. gallon | 1581,975 | oz/gal |
| Ounce per British gallon | 1900,74 | |
| Ounce per U.S. bushel | 14729,55 |
British Gravitational and English Engineering Units:
| Slug per cubic yard | 620,8215 | slug/yd³ |
| Slug per cubic foot | 22,989 | slug/ft³ |
| Slug per cubic inch | 0,01330755 | slug/in³ |