The density, or more precisely, the volumetric mass density of potassium is 856 kg/m³. This means that the mass of 1 m³ potassium is 856 kg.
The weight (on earth) of 1 m³ potassium is 8397,36 N or 8,39736 kN.
Conversion Chart Metric System:
| Kilogram per cubic meter | 856 | kg/m³ |
| Tonne per cubic meter | 0,856 | t/m³ |
| Gram per cubic meter | 856000 | g/m³ |
| Milligram per cubic meter | 856000000 | mg/m³ |
| Kilogram per cubic centimeter | 0,000856 | kg/cm³ |
| Gram per cubic centimeter | 0,856 | g/cm³ |
| Milligram per cubic centimeter | 856 | mg/cm³ |
| Kilogram per litre | 0,856 | kg/L |
| Gram per litre | 856 | g/L |
| Milligram per litre | 856000 | mg/L |
| Kilogram per millilitre | 0,000856 | kg/mL |
| Gram per millilitre | 0,856 | g/mL |
| Milligram per millilitre | 856 | mg/mL |
Conversion Chart British and U.S.:
| Pound per cubic yard | 1443,216 | lb/yd³ |
| Pound per cubic foot | 53,44008 | lb/ft³ |
| Pound per cubic inch | 0,03092728 | lb/in³ |
| Pound per U.S. gallon | 7,14332 | lb/gal |
| Pound per British gallon | 8,57712 | |
| Pound per U.S. bushel | 66,50264 | |
| Ounce per cubic yard | 23086,32 | oz/yd³ |
| Ounce per cubic foot | 854,9728 | oz/ft³ |
| Ounce per cubic inch | 0,494768 | oz/in³ |
| Ounce per U.S. gallon | 114,276 | oz/gal |
| Ounce per British gallon | 137,3024 | |
| Ounce per U.S. bushel | 1064,008 |
British Gravitational and English Engineering Units:
| Slug per cubic yard | 44,84584 | slug/yd³ |
| Slug per cubic foot | 1,66064 | slug/ft³ |
| Slug per cubic inch | 0,000961288 | slug/in³ |