Steel Hardness Conversion
Convert between Brinell (HB), Rockwell C (HRC), Rockwell B (HRB), and Vickers (HV) hardness scales. Values are approximate and for guidance only — each scale uses a different measurement method.
Steel Hardness Conversion Calculator
Enter a value in any one field and click Calculate — the nearest equivalent in each scale is shown. Zero indicates out of range.
Enhance Your Skills — All Training Presentations Free
Research has shown that additional training has a positive impact on employment opportunities. Acquiring new skills and competencies can extend options for professional advancement and offer additional career choices. There are also indications that VET may contribute to reducing unemployment and protect people from becoming unemployed in the first place.
Formula A — Convert HRC into HB
| HRC Range | Brinell HB Formula |
|---|---|
| 21 – 30 | HB = 5.970 × HRC + 104.7 |
| 31 – 40 | HB = 8.570 × HRC + 27.6 |
| 41 – 50 | HB = 11.158 × HRC − 79.6 |
| 51 – 60 | HB = 17.515 × HRC − 401 |
Formula B — Convert HRB into HB
| HRB Range | Brinell HB Formula |
|---|---|
| 55 – 69 | HB = 1.646 × HRB + 8.7 |
| 70 – 79 | HB = 2.394 × HRB − 42.7 |
| 80 – 89 | HB = 3.297 × HRB − 114 |
| 90 – 100 | HB = 5.582 × HRB − 319 |
Source: ASTM A 370 standard. Values are approximate; no universal conversion formula exists across all scales.
| HRC | HB (Brinell 3000 kgf) | HV (Vickers 30 kgf) | Rm — Tensile Strength (MPa) |
|---|---|---|---|
| Diamond penetrator | Brinell 3000 Kgf | Vickers 30 | N/mm² MPa |
| 20 | 226 | 238 | 760 |
| 21 | 231 | 243 | 770 |
| 22 | 237 | 248 | 790 |
| 23 | 243 | 254 | 810 |
| 24 | 247 | 260 | 820 |
| 25 | 253 | 266 | 850 |
| 26 | 258 | 272 | 860 |
| 27 | 264 | 279 | 880 |
| 28 | 271 | 286 | 900 |
| 29 | 279 | 294 | 930 |
| 30 | 286 | 302 | 950 |
| 31 | 294 | 310 | 970 |
| 32 | 301 | 318 | 1010 |
| 33 | 311 | 327 | 1030 |
| 34 | 319 | 336 | 1050 |
| 35 | 327 | 345 | 1080 |
| 36 | 336 | 354 | 1110 |
| 37 | 344 | 363 | 1140 |
| 38 | 353 | 372 | 1180 |
| 39 | 362 | 382 | 1220 |
| 40 | 371 | 392 | 1250 |
| 41 | 381 | 402 | 1300 |
| 42 | 390 | 412 | 1340 |
| 43 | 400 | 423 | 1390 |
| 44 | 409 | 434 | 1430 |
| 45 | 421 | 446 | 1480 |
| 46 | 432 | 458 | 1520 |
| 47 | 442 | 471 | 1580 |
| 48 | 455 | 484 | 1640 |
| 49 | 468 | 498 | 1700 |
| 50 | 482 | 513 | 1760 |
| 51 | 496 | 528 | 1820 |
| 52 | 512 | 544 | 1880 |
| 53 | 525 | 560 | 1950 |
| 54 | 543 | 577 | 2010 |
| 55 | 560 | 595 | 2070 |
| 56 | 577 | 613 | 2160 |
| 57 | 595 | 633 | 2240 |
| 58 | 615 | 653 | 2330 |
| 59 | 634 | 674 | 2420 |
| 60 | 654 | 697 | — |
| 61 | 670 | 720 | — |
| 62 | 688 | 746 | — |
| 63 | 706 | 772 | — |
| 64 | 722 | 800 | — |
| 65 | 739 | 832 | — |
| 66 | — | 865 | — |
| 67 | — | 900 | — |
| 68 | — | 940 | — |
| HRB | HB (Brinell 3000 kgf) | HV (Vickers 30 kgf) | Rm — Tensile Strength (MPa) |
|---|---|---|---|
| Ball 1/16" | Brinell 3000 Kgf | Vickers 30 | N/mm² MPa |
| 49 | 92 | — | 320 |
| 51 | 94 | — | 330 |
| 54 | — | — | — |
| 55 | 100 | 100 | 340 |
| 56 | 101 | 101 | — |
| 57 | 103 | 103 | 350 |
| 58 | 104 | 104 | — |
| 59 | 106 | 106 | 360 |
| 60 | 107 | 107 | — |
| 61 | 108 | 108 | — |
| 62 | 110 | 110 | 370 |
| 63 | 112 | 112 | — |
| 64 | 114 | 114 | — |
| 65 | 116 | 116 | 385 |
| 66 | 117 | 117 | 395 |
| 67 | 119 | 119 | 400 |
| 68 | 121 | 121 | 405 |
| 69 | 123 | 123 | 415 |
| 70 | 125 | 125 | 420 |
| 71 | 127 | 127 | 425 |
| 72 | 130 | 130 | 435 |
| 73 | 132 | 132 | 440 |
| 74 | 135 | 135 | 450 |
| 75 | 137 | 137 | 455 |
| 76 | 139 | 139 | 460 |
| 77 | 141 | 141 | 470 |
| 78 | 144 | 144 | 475 |
| 79 | 147 | 147 | 485 |
| 80 | 150 | 150 | 495 |
| 81 | 153 | 153 | 505 |
| 82 | 156 | 156 | 530 |
| 83 | 159 | 159 | 550 |
| 84 | 162 | 162 | 560 |
| 85 | 165 | 165 | 565 |
| 86 | 169 | 169 | 570 |
| 87 | 172 | 172 | 580 |
| 88 | 176 | 176 | 590 |
| 89 | 180 | 180 | 605 |
| 90 | 185 | 185 | 615 |
| 91 | 190 | 190 | 620 |
| 92 | 195 | 195 | 635 |
| 93 | 200 | 200 | 650 |
| 94 | 205 | 205 | 675 |
| 95 | 210 | 210 | 690 |
| 96 | 216 | 216 | 705 |
| 97 | 222 | 222 | 715 |
| 98 | 228 | 228 | 750 |
| 99 | 234 | 234 | 785 |
| 100 | 240 | 240 | 800 |
HRC — Diamond penetrator 120°, load 1470 N (150 kgf), duration 30 seconds.
HRB — Ball 1/16″, load 980 N (100 kgf), duration 30 seconds.
HB — Ball 10 mm, load 29,400 N (3000 kgf), duration 15 seconds.
BHN — Brinell Hardness Number — same meaning as HB.
HV — Diamond penetrator 136°, load 294 N (30 kgf), duration 15 seconds.