Rockwell Hardness Conversion Calculator

Your details

Select the scale on which you measured the hardness. The calculator converts to all remaining scales.
Enter the measured hardness number on the selected scale. HRC range: 20-68. HRB range: 60-100. HV range: 80-940. HBW range: 100-940.
HRC
Rockwell C (HRC)Hard
45

Diamond cone indenter, 150 kgf. Range 20-68.

Rockwell A (HRA)73.1
Brinell (HBW)-1
Vickers (HV)446
Knoop (HK)466
Approx. tensile strength1,551MPa
Approx. tensile strength225ksi
Hardness categoryHard
45 HRC
Soft-Medium<30Medium Hard30-45Hard45-60Very Hard60+

HRC 45 converts to approximately HV 446 (Hard).

  • Vickers HV 446 is the universal scale most labs also report alongside HRC.
  • Estimated tensile strength: 1551 MPa (225 ksi). Valid only for non-austenitic steel.
  • All conversions are approximate and validated only for non-austenitic steel. Different alloys require material-specific tables.

Next stepCheck whether your material is steel; for aluminium, copper, or titanium, use the alloy-specific ASTM E140 annexes.

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