Hardness Converter
Convert between hardness scales including Rockwell, Vickers, Brinell, and Knoop.
30 HRC =
350.3
Vickers (HV)
Note: Conversions are approximate and based on carbon steel. Actual values may vary by material.
30 HRC in all scales
Rockwell C (HRC)51
Rockwell B (HRB)N/A
Vickers (HV)350.3
Brinell (HB)333.6
Knoop (HK)368.7
Hardness Scale Ranges
Rockwell C (HRC)
20-70 (hardened steel)
Rockwell B (HRB)
0-100 (soft steel, brass)
Vickers (HV)
100-1000+ (all materials)
Brinell (HB)
50-650 (metals)
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: NIST Guide to SI Units
by National Institute of Standards
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.