Hardness Conversion Calculator

Enter value, select the conversion and click on calculate. Result will be displayed. Hardness Conversion Calculator are for Austenitic Stainless Steel and formulas as per ASTM E140-12. HRB = Rockwell Hardness, HB = Brinell hardness

Enter Your Value:

Hardness Number:

HB to HRB HRB to HB

Result:

Converted Value:

Enter Your Value:

Hardness Number:

HR15T to HB HB to HR15T

Result:

Converted Value:

Enter Your Value:

Hardness Number:

HR30T to HB HB to HR30T

Result:

Converted Value:

Hardness Conversion Calculator ASTM E140 Brinell Vickers Rockwell Knoop Scleroscope

Rockwell Superficial Hardness Scales

Scale	Indenter Type	Minor Load F0 kgf	Major Load F1 kgf	Total Load F kgf	Value of E
HR 15 N	N Diamond cone	3	12	15	100
HR 30 N	N Diamond cone	3	27	30	100
HR 45 N	N Diamond cone	3	42	45	100
HR 15 T	1/16″ steel ball	3	12	15	100
HR 30 T	1/16″ steel ball	3	27	30	100
HR 45 T	1/16″ steel ball	3	42	45	100
HR 15 W	1/8″ steel ball	3	12	15	100
HR 30 W	1/8″ steel ball	3	27	30	100
HR 45 W	1/8″ steel ball	3	42	45	100
HR 15 X	1/4″ steel ball	3	12	15	100
HR 30 X	1/4″ steel ball	3	27	30	100
HR 45 X	1/4″ steel ball	3	42	45	100
HR 15 Y	1/2″ steel ball	3	12	15	100
HR 30 Y	1/2″ steel ball	3	27	30	100
HR 45 Y	1/2″ steel ball	3	42	45	100

Rockwell Brinell Vickers Shore Hardness Conversion Chart

Rockwell Hardness	Rockwell Hardness	Rockwell Hardness	Rockwell Hardness	Rockwell Hardness	Rockwell Hardness	Rockwell Superficial	Rockwell Superficial	Rockwell Superficial	Rockwell Superficial	Brinell Hardness	Brinell Hardness	Vickers Hardness	Shore
A	B	C	D	E	F	15-N	30-N	45-N	30-T	3000 kg	500 kg	136		Approx Tensile Strength(Mpa)
60 kg Brale	100 kg 1/16″ Ball	150 kg	100 kg	100 kg 1/8″ Ball	60kg 1/16″ Ball	15 kg	30 kg	45 kg	30 kg 1/16″ Ball	10mm Ball Steel	10mm Ball Steel	Diamond Pyramid	Sciero -scope	Approx Tensile Strength(Mpa)
86.5	—	70	78.5	—	—	94.0	86.0	77.6	—	—	—	1076	101	—
86.0	—	69	77.7	—	—	93.5	85.0	76.5	—	—	—	1044	99	—
85.6	—	68	76.9	—	—	93.2	84.4	75.4	—	—	—	940	97	—
85.0	—	67	76.1	—	—	92.9	83.6	74.2	—	—	—	900	95	—
84.5	—	66	75.4	—	—	92.5	82.8	73.2	—	—	—	865	92	—
83.9	—	65	74.5	—	—	92.2	81.9	72.0	—	739	—	832	91	—
83.4	—	64	73.8	—	—	91.8	81.1	71.0	—	722	—	800	88	—
82.8	—	63	73.0	—	—	91.4	80.1	69.9	—	705	—	772	87	—
82.3	—	62	72.2	—	—	91.1	79.3	68.8	—	688	—	746	85	—
81.8	—	61	71.5	—	—	90.7	78.4	67.7	—	670	—	720	83	—
81.2	—	60	70.7	—	—	90.2	77.5	66.6	—	654	—	697	81	220
80.7	—	59	69.9	—	—	89.8	76.6	65.5	—	634	—	674	80	213
80.1	—	58	69.2	—	—	89.3	75.7	64.3	—	615	—	653	78	207
79.6	—	57	68.5	—	—	88.9	74.8	63.2	—	595	—	633	76	200
79.0	—	56	67.7	—	—	88.3	73.9	62.0	—	577	—	613	75	194
78.5	120	55	66.9	—	—	87.9	73.0	60.9	—	560	—	595	74	188
78.0	120	54	66.1	—	—	87.4	72.0	59.8	—	543	—	577	72	182
77.4	119	53	65.4	—	—	86.9	71.2	58.6	—	525	—	560	71	176
76.8	119	52	64.6	—	—	86.4	70.2	57.4	—	500	—	544	69	169
76.3	118	51	63.8	—	—	85.9	69.4	56.1	—	487	—	528	68	165
75.9	117	50	63.1	—	—	85.5	68.5	55.0	—	475	—	513	67	161
75.2	117	49	62.1	—	—	85.0	67.6	53.8	—	464	—	498	66	157
74.7	116	48	61.4	—	—	84.5	66.7	52.5	—	451	—	484	64	152
74.1	116	47	60.8	—	—	83.9	65.8	51.4	—	442	—	471	63	150
73.6	115	46	60.0	—	—	83.5	64.8	50.3	—	432	—	458	62	146
73.1	115	45	59.2	—	—	83.0	64.0	49.0	—	421	—	446	60	142
72.5	114	44	58.5	—	—	82.5	63.1	47.8	—	409	—	434	58	138
72.0	113	43	57.7	—	—	82.0	62.2	46.7	—	400	—	423	57	135
71.5	113	42	56.9	—	—	81.5	61.3	45.5	—	390	—	412	56	132
70.9	112	41	56.2	—	—	80.9	60.4	44.3	—	381	—	402	55	129
70.4	112	40	55.4	—	—	80.4	59.5	43.1	—	371	—	392	54	125
69.9	111	39	54.6	—	—	79.9	58.6	41.9	—	362	—	382	52	122
69.4	110	38	53.8	—	—	79.4	57.7	40.8	—	353	—	372	51	119
68.9	110	37	53.1	—	—	78.8	56.8	39.6	—	344	—	363	50	117
68.4	109	36	52.3	—	—	78.3	55.9	38.4	—	336	—	354	49	114
67.9	109	35	51.5	—	—	77.7	55.0	37.2	—	327	—	345	48	110
67.4	108	34	50.8	—	—	77.2	54.2	36.1	—	319	—	336	47	108
66.8	108	33	50.0	—	—	76.6	53.3	34.9	—	311	—	327	46	105
66.3	107	32	49.2	—	—	76.1	52.1	33.7	—	301	—	318	44	101
65.8	106	31	48.4	—	—	75.6	51.3	32.5	—	294	—	310	43	99
65.3	105	30	47.7	—	—	75.0	50.4	31.3	—	286	—	302	42	97
64.7	104	29	47.0	—	—	74.5	49.5	30.1	—	279	—	294	41	94
64.3	104	28	46.1	—	—	73.9	48.6	28.9	—	271	—	286	41	92
63.8	103	27	45.2	—	—	73.3	47.7	27.8	—	264	—	279	40	89
63.3	103	26	44.6	—	—	72.8	46.8	26.7	—	258	—	272	39	87
62.8	102	25	43.8	—	—	72.2	45.9	25.5	—	253	—	266	38	86
62.4	101	24	43.1	—	—	71.6	45.0	24.3	—	247	—	260	37	83
62.0	100	23	42.1	—	—	71.0	44.0	23.1	82.0	240	201	254	36	81
61.5	99	22	41.6	—	—	70.5	43.2	22.0	81.5	234	195	248	35	79
61.0	98	21	40.9	—	—	69.9	42.3	20.7	81.0	228	189	243	35	77
60.5	97	20	40.1	—	—	69.4	41.5	19.6	80.5	222	184	238	34	75
59.0	96	18	—	—	—	—	—	—	80.0	216	179	230	33	73
58.0	95	16	—	—	—	—	—	—	79.0	210	175	222	32	71
57.5	94	15	—	—	—	—	—	—	78.5	205	171	213	31	69
57.0	93	13	—	—	—	—	—	—	78.0	200	167	208	30	68
56.5	92	12	—	—	—	—	—	—	77.5	195	163	204	29	66
56.0	91	10	—	—	—	—	—	—	77.0	190	160	196	28	64
55.5	90	9	—	—	—	—	—	—	76.0	185	157	192	27	63
55.0	89	8	—	—	—	—	—	—	75.5	180	154	188	26	61
54.0	88	7	—	—	—	—	—	—	75.0	176	151	184	26	59
53.5	87	6	—	—	—	—	—	—	74.5	172	148	180	26	58
53.0	86	5	—	—	—	—	—	—	74.0	169	145	176	25	57
52.5	85	4	—	—	—	—	—	—	73.5	165	142	173	25	56
52.0	84	3	—	—	—	—	—	—	73.0	162	140	170	25	55
51.0	83	2	—	—	—	—	—	—	72.0	159	137	166	24	54
50.5	82	1	—	—	—	—	—	—	71.5	156	135	163	24	52
50.0	81	0	—	—	—	—	—	—	71.0	153	133	160	24	52
49.5	80	—	—	—	—	—	—	—	70.0	150	130	—	—	50

Hardness Conversion Chart

Brinell Hardness (HB)	Vickers Hardness (HV)	Rockwell (HRB)	Rockwell(HRC)	Ultimate Tensile Strength (N/mm2)
–	640	–	57	–
–	615	–	56	–
–	591	–	54.5	–
–	569	–	53.5	–
–	547	–	52	–
–	528	–	51	–
–	508	–	49.5	–
–	491	–	48.5	1539
444	474	–	47	1520
429	455	–	45.5	1471
415	440	–	44.5	1422
401	425	–	43	1363
388	410	–	42	1314
375	396	–	40.5	1265
363	383	–	39	1236
352	372	–	38	1187
341	360	–	36.5	1157
331	350	–	35.5	1118
321	339	–	34.5	1089
311	328	–	33	1049
302	319	–	32	1020
293	309	–	31	990
285	301	–	30	971
277	292	–	29	941
269	284	–	27.5	912
262	276	–	26.5	892
255	269	100	25.5	873
248	261	99	24	853
241	253	98	23	824
235	247	97	22	794
229	241	96	20.5	775
223	235	–	–	755
217	228	95	–	745
212	223	94	–	716
207	218	93	–	696
197	208	91	–	667
187	197	89	–	637
179	189	87	–	608
170	179	85	–	559
163	172	83	–	539
156	165	81	–	530
149	157	79	–	500
143	150	77	–	481
137	144	74	–	471
131	138	72	–	461
126	133	69	–	451
121	127	67	–	431
116	122	64	–	422
111	117	61	–	402
107	113	–	–	382
103	108	–	–	373