Hardness Converter
Convert between Rockwell C, Brinell, and Vickers hardness scales.
Lookup table for steel and metals.
Type in any field — the others update using standard steel conversion data. Values are approximate.
Material hardness is measured using different scales depending on the application. There is no exact mathematical formula between scales — conversions are based on empirical data.
Common hardness scales:
- Rockwell C (HRC) — most common for hardened steel (range 20–70)
- Brinell (HB) — widely used for softer metals and raw stock
- Vickers (HV) — versatile, works on all materials including thin coatings
Approximate conversion table (for steel):
| HRC | HB | HV |
|---|---|---|
| 20 | 226 | 238 |
| 25 | 253 | 266 |
| 30 | 286 | 302 |
| 35 | 331 | 345 |
| 40 | 371 | 392 |
| 45 | 421 | 446 |
| 50 | 481 | 513 |
| 55 | 560 | 595 |
| 60 | 654 | 697 |
| 65 | 739 | 832 |
Mohs scale measures scratch resistance (1–10). It is mainly used for minerals, not metals.
- 1 = Talc, 5 = Glass, 7 = Quartz, 10 = Diamond
Note: Conversions between hardness scales are approximate. They vary depending on the specific material being tested.