Hardness Conversion Calculator

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Choose the hardness scale of your measurement.
Enter the hardness number from your test or data sheet.
Rockwell C (HRC)Hard
45

Rockwell hardness on the C scale (diamond indentor, 150 kgf)

Rockwell A (HRA)73.1
Vickers (HV)446
Brinell (HB)421
45 HRC
Soft<20Medium hard20-35Hard35-50Very hard50-60Extreme60+

45 Rockwell C (HRC) converted across all major hardness scales.

  • Hard: Springs, knives, gear faces, high-strength bolts.
  • On the Vickers scale this is 446 HV; on the Brinell scale it is approximately 421 HB.
  • These values apply to non-austenitic steels per ASTM E140. For aluminium, copper, or other alloys the correlations differ - consult the material-specific standard.

Next stepIf you measured hardness on a material other than carbon or alloy steel, treat these conversions as estimates only. Hardness-to-tensile correlations are not universal.

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