| 1 mmol/L | 1 ppm, mg/L | 1 dGH, °dH | 1 gpg | 1 °e, °Clark | 1 °fH | |
| mmol/L | 1 | 0.009991 | 0.1783 | 0.171 | 0.1424 | 0.09991 |
| ppm, mg/L | 100.1 | 1 | 17.85 | 17.12 | 14.25 | 10 |
| dGH, °dH | 5.608 | 0.05603 | 1 | 0.9591 | 0.7986 | 0.5603 |
| gpg | 5.847 | 0.05842 | 1.043 | 1 | 0.8327 | 0.5842 |
| °e, °Clark | 7.022 | 0.07016 | 1.252 | 1.201 | 1 | 0.7016 |
| °fH | 10.01 | 0.1 | 1.785 | 1.712 | 1.425 | 1 |
