💎 Hardness Converter

Enter a value in any field and the others auto-calculate. Approximate conversions per ASTM E140.

Rockwell C (HRC)

Rockwell B (HRB)

Brinell (HB)

Vickers (HV)

Note: These are approximate conversions. Exact relationships depend on material composition and condition. Use ASTM E140 tables for critical applications.
HRC range: 20–68 | HRB range: 0–100 | HB range: 100–739

Why Hardness Conversion Matters

Material hardness directly determines your cutting parameters, tool selection, and whether a part can be machined at all. Prints may call out Rockwell C, but your shop tester reads Brinell — you need reliable conversion between scales.

Rockwell C (HRC) is standard for hardened steels above 20 HRC; Rockwell B (HRB) covers softer materials like mild steel and aluminum
Brinell (HB) is common on raw material certs and casting specs — converting to HRC tells you if the material is machinable with carbide or needs CBN
Vickers (HV) is used for thin coatings, case-hardened layers, and micro-hardness testing where the indentation must be small

💎 Hardness Converter

Why Hardness Conversion Matters

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