Steel Hardness conversion calculator

Rockwell HRA Rockwell HRB Rockwell HRC Brinell Hardness HB Rockwell 15N Rockwell 30N Rockwell 45N Vickers HV N/mm² Calculate
Enter a figure into any of the fields and click calculate, the nearest values in each scale is shown, or zero if out of range. Values are approximate and for guidance only.

Steel hardness conversion chart - all values approximate.


This table shows approximate hardness of steel using Brinell, Rockwell B and C and Vickers scales. These conversion charts are provided for guidance only as each scales uses different methods of measuring hardness. The right hand column show an approximate equivalent tensile strength.
68.9
Rockwell HRA Rockwell HRB Rockwell HRC Brinell Hardness HB Rockwell 15N Rockwell 30N Rockwell 45N Vickers HV N/mm²
86.5 --- 70 760 94 86 77.6 1076 ---
86 --- 69 752 93.5 85 76.5 1044 ---
85.6 --- 68 745 93.2 84.4 75.4 940 ---
85 --- 67 746 92.9 83.6 74.2 900 ---
84.5 --- 66 735 92.5 82.8 73.2 865 ---
83.9 --- 65 711 92.2 81.9 72 832 ---
83.4 --- 64 695 91.8 81.1 71 800 ---
82.8 --- 63 681 91.4 80.1 69.9 772 ---
82.3 --- 62 658 91.1 79.3 68.8 746 ---
81.8 --- 61 642 90.7 78.4 67.7 720 ---
81.2 --- 60 627 90.2 77.5 66.6 697 ---
80.7 --- 59 613 89.8 76.6 65.5 674 ---
80.1 --- 58 601 89.3 75.7 64.3 653 ---
79.6 --- 57 592 88.9 74.8 63.2 633 ---
79 --- 56 572 88.3 73.9 62 613 ---
78.5 120 55 552 87.9 73 60.9 595 ---
78 120 54 534 87.4 72 59.8 577 ---
77.4 119 53 513 86.9 71.2 58.6 560 ---
76.8 119 52 504 86.4 70.2 57.4 544 ---
76.3 118 51 486 85.9 69.4 56.1 528 ---
75.9 117 50 469 85.5 68.5 55 513 ---
75.2 117 49 468 85 67.6 53.8 498 ---
74.7 116 48 456 84.5 66.7 52.5 484 1569
74.1 116 47 445 83.9 65.8 51.4 471 1520
73.6 115 46 430 83.5 64.8 50.3 458 1471
73.1 115 45 419 83 64 49 446 1447
72.5 114 44 415 82.5 63.1 47.8 434 1422
72 113 43 402 82 62.2 46.7 423 1390
71.5 113 42 388 81.5 61.3 45.5 412 1363
70.9 112 41 375 80.9 60.4 44.3 402 1314
70.4 112 40 373 80.4 59.5 43.1 392 1265
69.9 111 39 360 79.9 58.6 41.9 382 1236
69.4 110 38 348 79.4 57.7 40.8 372 1187
110 37 341 78.8 56.8 39.6 363 1157
68.4 109 36 331 78.3 55.9 38.4 354 1118
67.9 109 35 322 77.7 55 37.2 345 1089
67.4 108 34 314 77.2 54.2 36.1 336 1049
66.8 108 33 308 76.6 53.3 34.9 327 1035
66.3 107 32 300 76.1 52.1 33.7 318 1020
65.8 106 31 290 75.6 51.3 32.5 310 990
65.3 105 30 277 75 50.4 31.3 302 971
64.7 104 29 271 74.5 49.5 30.1 294 941
64.3 104 28 264 73.9 48.6 28.9 286 892
63.8 103 27 262 73.3 47.7 27.8 279 880
63.3 103 26 255 72.8 46.8 26.7 272 870
62.8 102 25 250 72.2 45.9 25.5 266 853
62.4 101 24 245 71.6 45 24.3 260 838
62 100 23 240 71 44 23.1 254 824
61.5 99 22 233 70.5 43.2 22 248 794
61 98 21 229 69.9 42.3 20.7 243 775
60.5 97 20 223 69.4 41.5 19.6 238 755
59 96 18 216 --- --- --- 230 716
58 95 16 212 --- --- --- 222 706
57.5 94 15 203 --- --- --- 213 696
57 93 13 119 --- --- --- 208 680
56.5 92 12 191 --- --- --- 204 667
56 91 10 186 --- --- --- 196 657
55.5 90 9 183 --- --- --- 192 648
55 89 8 180 --- --- --- 188 637
54 88 7 175 --- --- --- 184 617
53.5 87 6 170 --- --- --- 180 608
53 86 5 167 --- --- --- 176 685
52.5 85 4 163 --- --- --- 173 559
52 84 3 160 --- --- --- 170 555
51 83 2 156 --- --- --- 166 549
50.5 82 1 154 --- --- --- 163 539
50 81 0 149 --- --- --- 160 535
49.5 80 --- 147 --- --- --- 158 530
49 79 --- 143 --- --- --- 152 515
48.5 78 --- 141 --- --- --- 149 500
48 77 --- 139 --- --- --- 147 490
47 76 --- 137 --- --- --- 146 482
46.5 75 --- 135 --- --- --- 144 481
46 74 --- 131 --- --- --- 142 480
45.5 73 --- --- --- --- --- 140 475
45 72 --- 127 --- --- --- 137 467
44.5 71 --- --- --- --- --- 134 461
44 70 --- 121 --- --- --- 129 451
43.5 69 --- --- --- --- --- 127 431
43 68 --- 116 --- --- --- 124 422
42.5 67 --- 114 --- --- --- 121 412
42 66 --- 111 --- --- --- 118 402
41.8 65 --- --- --- --- --- 115 382
41.5 64 --- 107 --- --- --- 112 378
41 63 --- --- --- --- --- 108 373
40.5 62 --- 105 --- --- --- 104 ---
40 61 --- 103 --- --- --- 95 ---
39.5 60 --- --- --- --- --- 85 ---
39 59 --- --- --- --- --- 80 ---
38.5 58 --- --- --- --- --- --- ---
38 57 --- --- --- --- --- --- ---
37.8 56 --- 95 --- --- --- --- ---
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36 52 --- 90 --- --- --- --- ---
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31 41 --- 81 --- --- --- --- ---
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29.5 37 --- 76 --- --- --- --- ---
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Rockwell HRA Rockwell HRB Rockwell HRC Brinell Hardness Rockwell 15N Rockwell 30N Rockwell 45N Vickers HV N/mm²

Reference table: Steel Hardness conversion chart

Since the various types of hardness tests do not all measure the same combination of material properties, conversion from one hardness scale to another is only an approximate process. Because of the wide range of variation among different materials, it is not possible to state confidence limits for the errors in using a conversion chart.


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