This hardness converter calculates Rockwell hardness numbers (HRB, HRC) from load and indentation depth, and converts between Rockwell, Vickers, and Brinell scales across seven material groups.
Physics
Rockwell Hardness Conversion Calculator
Convert Rockwell hardness to Vickers or Brinell across seven material groups.
Calculator
About this calculator
Formula notes
Rockwell number = scaleFactorF - 0.5 x depth(mm); scale conversions use material-specific polynomial and rational formulas.
Worked examples
- Example: a 100 kgf major load with 0.1 mm depth on the C scale gives HRC 99.95.
- A 100 kgf major load with 0.1 mm depth on the C scale gives HRC 99.95.
How to use it
- Choose calculate or convert mode.
- For calculate: select the scale, enter the major load and indentation depth.
- For convert: select a material, enter a known hardness value, and read the converted scales.
Frequently asked questions
What materials are supported?
Non-austenitic steels, nickel alloys, cartridge brass, annealed austenitic stainless steel, copper, alloyed white iron, and wrought aluminum.
What is the valid indentation depth range?
The depth must be greater than zero and less than 2 mm.
Limits and interpretation
- The indentation depth must be greater than zero and less than 2 mm.
- Material-specific conversion formulas are empirical polynomials; results are approximations, not exact standards.