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Calcimator

Hardness Conversion Calculator

Convert between Rockwell C, Brinell, Vickers, and Knoop hardness scales with estimated tensile strength.

Convert

Results

Rockwell C (HRC)
45 HRC
Brinell (HB)
665 HB
Vickers (HV)
1,104 HV
Knoop (HK)
1,159 HK
Est. Tensile Strength
2,295 MPa
How to Use This Calculator
  1. Enter the Hardness Value — the measured number from your hardness tester.
  2. Set the From Scale: 1 = Rockwell C (HRC), 2 = Brinell (HB), 3 = Vickers (HV), 4 = Knoop (HK).
  3. The calculator instantly converts to all other hardness scales using ASTM E140 correlation tables.
  4. Review Est. Tensile Strength (MPa) to cross-reference mechanical property specifications.
  5. Use results to verify incoming material certifications or select heat treatment parameters.

How the result changes with Hardness Value

Hardness ValueRockwell C (HRC)Est. Tensile Strength
201201 HRC5,296 MPa
701701 HRC-12,244 MPa
1,3001,300 HRC-87,764 MPa
1,8001,800 HRC-196,301 MPa

What each input means

Hardness Value
The measured hardness value in the selected scale to convert.
From Scale
Source hardness scale: 1 = Rockwell C, 2 = Brinell, 3 = Vickers, 4 = Knoop.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Hardness Value = 45, From Scale = 1 = 2 input(s) provided
  2. Calculate Rockwell C
    Rockwell C
    45 = 45
  3. Calculate Est. Tensile Strength
    Est. Tensile Strength
    2295 = 2295
  4. Calculate Brinell
    Brinell
    665 = 665
  5. Calculate Vickers
    Vickers
    1104 = 1104

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