HRC · HV · HB · HRB · tensile
Hardness Conversion Calculator
Convert hardness between Rockwell C, Vickers and Brinell scales, with approximate tensile strength — plus the full reference table below (equivalent to ASTM E140 values for non-austenitic steels).
Scale conversion
HRC ↔ HV ↔ HBHRC ↔ HV ↔ HB conversion chart
| HRC | Vickers HV | Brinell HB | HRB | Tensile strength (approx.) |
|---|---|---|---|---|
| 68 | 940 | — | 97 | — |
| 67 | 900 | — | 95 | — |
| 66 | 865 | — | 92 | — |
| 65 | 832 | 739 | 82 | — |
| 64 | 800 | 722 | 80 | — |
| 63 | 772 | 705 | 77 | — |
| 62 | 746 | 688 | 74 | — |
| 61 | 720 | 670 | 71 | — |
| 60 | 697 | 654 | 68 | 2435 MPa / 353 ksi |
| 59 | 674 | 634 | 66 | 2340 MPa / 339 ksi |
| 58 | 653 | 615 | 64 | 2245 MPa / 326 ksi |
| 57 | 633 | 595 | 62 | 2165 MPa / 314 ksi |
| 56 | 613 | 577 | 60 | 2085 MPa / 302 ksi |
| 55 | 595 | 560 | 58 | 2020 MPa / 293 ksi |
| 54 | 577 | 543 | 56 | 1950 MPa / 283 ksi |
| 53 | 560 | 525 | 54 | 1885 MPa / 273 ksi |
| 52 | 544 | 512 | 52 | 1825 MPa / 265 ksi |
| 51 | 528 | 496 | 50 | 1765 MPa / 256 ksi |
| 50 | 513 | 481 | 48 | 1705 MPa / 247 ksi |
| 49 | 498 | 469 | 47 | 1660 MPa / 241 ksi |
| 48 | 484 | 455 | 45 | 1600 MPa / 232 ksi |
| 47 | 471 | 443 | 43 | 1555 MPa / 226 ksi |
| 46 | 458 | 432 | 41 | 1510 MPa / 219 ksi |
| 45 | 446 | 421 | 40 | 1470 MPa / 213 ksi |
| 44 | 434 | 409 | 38 | 1430 MPa / 207 ksi |
| 43 | 423 | 400 | 36 | 1390 MPa / 202 ksi |
| 42 | 412 | 390 | 35 | 1350 MPa / 196 ksi |
| 41 | 402 | 381 | 33 | 1320 MPa / 191 ksi |
| 40 | 392 | 371 | 31 | 1280 MPa / 186 ksi |
| 39 | 382 | 362 | 30 | 1250 MPa / 181 ksi |
| 38 | 372 | 353 | 28 | 1215 MPa / 176 ksi |
| 37 | 363 | 344 | 26 | 1180 MPa / 171 ksi |
| 36 | 354 | 336 | 25 | 1150 MPa / 167 ksi |
| 35 | 345 | 327 | 23 | 1115 MPa / 162 ksi |
| 34 | 336 | 319 | 21 | 1090 MPa / 158 ksi |
| 33 | 327 | 311 | 20 | 1060 MPa / 154 ksi |
| 32 | 318 | 301 | 18 | 1030 MPa / 149 ksi |
| 31 | 310 | 294 | 16 | 1005 MPa / 146 ksi |
| 30 | 302 | 286 | 15 | 980 MPa / 142 ksi |
| 29 | 294 | 277 | 13 | 950 MPa / 138 ksi |
| 28 | 286 | 271 | 12 | 930 MPa / 135 ksi |
| 27 | 279 | 264 | 10 | 905 MPa / 131 ksi |
| 26 | 271 | 258 | 8 | 880 MPa / 128 ksi |
| 25 | 264 | 253 | 7 | 860 MPa / 125 ksi |
| 24 | 257 | 247 | 5 | 840 MPa / 122 ksi |
| 23 | 251 | 243 | 4 | 825 MPa / 120 ksi |
| 22 | 245 | 240 | 2.5 | 810 MPa / 117 ksi |
| 21 | 240 | 231 | 1 | 790 MPa / 115 ksi |
| 20 | 235 | 226 | — | 775 MPa / 112 ksi |
Frequently asked questions
Are hardness conversions exact?
No — conversions are empirical and material-dependent. Tables like ASTM E140 are valid for non-austenitic steels; treat converted values as approximations, and never convert for specification acceptance without the standard's permission.
What is the approximate tensile strength from hardness?
For carbon and alloy steels, tensile strength (MPa) ≈ 3.3–3.5 × Brinell hardness. HRC 40 (≈ HB 371) corresponds to roughly 1280 MPa or 185 ksi.