The density, or more precisely, the volumetric mass density of lanthanum is 6146 kg/m³. This means that the mass of 1 m³ lanthanum is 6146 kg.
The weight (on earth) of 1 m³ lanthanum is 60292,26 N or 60,29226 kN.
Conversion Chart Metric System:
| Kilogram per cubic meter | 6146 | kg/m³ |
| Tonne per cubic meter | 6,146 | t/m³ |
| Gram per cubic meter | 6146000 | g/m³ |
| Milligram per cubic meter | 6146000000 | mg/m³ |
| Kilogram per cubic centimeter | 0,006146 | kg/cm³ |
| Gram per cubic centimeter | 6,146 | g/cm³ |
| Milligram per cubic centimeter | 6146 | mg/cm³ |
| Kilogram per litre | 6,146 | kg/L |
| Gram per litre | 6146 | g/L |
| Milligram per litre | 6146000 | mg/L |
| Kilogram per millilitre | 0,006146 | kg/mL |
| Gram per millilitre | 6,146 | g/mL |
| Milligram per millilitre | 6146 | mg/mL |
Conversion Chart British and U.S.:
| Pound per cubic yard | 10362,156 | lb/yd³ |
| Pound per cubic foot | 383,69478 | lb/ft³ |
| Pound per cubic inch | 0,22205498 | lb/in³ |
| Pound per U.S. gallon | 51,28837 | lb/gal |
| Pound per British gallon | 61,58292 | |
| Pound per U.S. bushel | 477,48274 | |
| Ounce per cubic yard | 165757,62 | oz/yd³ |
| Ounce per cubic foot | 6138,6248 | oz/ft³ |
| Ounce per cubic inch | 3,552388 | oz/in³ |
| Ounce per U.S. gallon | 820,491 | oz/gal |
| Ounce per British gallon | 985,8184 | |
| Ounce per U.S. bushel | 7639,478 |
British Gravitational and English Engineering Units:
| Slug per cubic yard | 321,98894 | slug/yd³ |
| Slug per cubic foot | 11,92324 | slug/ft³ |
| Slug per cubic inch | 0,006901958 | slug/in³ |