Hardness Converter
Approximate steel hardness conversion between HRC, HRB, HV, and HBW. Not valid as an inspection substitute; use ASTM E140 / ISO 18265 material-specific tables or direct testing for acceptance.
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Enter machining data
Default values are examples. Replace them with your actual setup data.
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Formula and engineering notes
Formula / logic
Uses table interpolation from public ASTM E140-style steel conversion tables. HRC↔HV↔HBW is limited to non-austenitic steels in roughly the HRC 20–68 range; HRB values are low-hardness steel guidance only. Conversions are approximate and material-specific.
Uses table interpolation from public ASTM E140-style steel conversion tables. HRC↔HV↔HBW is limited to non-austenitic steels in roughly the HRC 20–68 range; HRB values are low-hardness steel guidance only. Conversions are approximate and material-specific.
Engineering disclaimer: these tools are for estimating and planning. Verify production parameters with toolmaker catalogs, machine limits, material data, and applicable standards.
Frequently asked questions
Can this result be used directly on a CNC machine?
Use it as a starting value only. Check the tool manufacturer data, machine limits, workholding, coolant and material condition before production.
Which units does the calculator support?
The calculator shows the units beside each input. Select metric or inch units where the page provides a unit-system control.
Why can shop results differ from the calculation?
Tool geometry, coating, runout, rigidity, chip evacuation, material hardness and machine power can change the practical result.