Sharpness Standards

Resources

The BESS (Brubacher Edge Sharpness Scale) sharpening standard is a globally recognized, numerical scale for quantifying knife sharpness based on the force (in grams) required to cut a standardized test medium.

Developed by Mike Brubacher, a lower BESS score signifies a sharper edge, ranging from 2000 for an unsharpened knife to 0 for ultimate sharpness, allowing for precise, objective comparison of edge performance.

How the BESS Scale Works

  1. Test Medium: A calibrated, synthetic "wire" (often a stiff plastic filament) is stretched across a fixture.

  2. Measurement: A knife edge is pressed onto the filament. The tester measures the force (in grams) needed to sever it.

  3. Scoring: The required force is the BESS score; lower numbers mean a sharper blade.

Key Features & Benefits

  • Standardization: Ensures consistent results by using identical test media and calibrated testers.

  • Quantifiable Data: Replaces subjective terms ("razor sharp") with measurable numbers, allowing for accurate tracking of sharpness over time.

  • Universal Language: Creates a clear, shared language for discussing sharpness among sharpeners, enthusiasts, and manufacturer

BESS Sharpness Classifications (Approximate)

  • Dull: >500 BESS

  • Working Edge: 300–400 BESS

  • Sharp: 250–300 BESS (comparable to new quality cutlery)

  • Very Sharp: 150–200 BESS (like a new utility knife)

  • Razor Sharp: ≤50 BESS (as sharp as a double-edge razor)

Resources and Helpful Information