90.5 Mohs = 0.89 HRC
| Mohs | HRC |
|---|---|
| 75.5 Mohs | 0.74 |
| 80.5 Mohs | 0.79 |
| 85.5 Mohs | 0.84 |
| 90.5 | 0.89 |
| 95.5 Mohs | 0.94 |
| 100.5 Mohs | 0.99 |
| 105.5 Mohs | 1.03 |
90.5 Mohs = 0.89 HRC
1 HRC ≈ 10.2 HV · 1 HRB ≈ 1.8 HV · 1 Mohs ≈ 0.1 HV — approximate; real conversions vary by material per ASTM E140