Vickers Hardness Number Calculator: HV Formula and Conversions

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Select which quantity to calculate. Enter the other two values.
The test load applied to the diamond indenter. Standard loads: 1, 2, 5, 10, 30, 50, 100 kgf.
kgf
Arithmetic mean of the two diagonals of the square indentation, measured under a microscope.
mm
Vickers Hardness (HV)Soft (copper, aluminium alloys)
74.2HV

Vickers Pyramid Hardness Number

Surface hardness727.4MPa
Brinell hardness (HB)70
Tensile strength245MPa
74.2 HV
Soft<100Medium100-200Hard200-400Very hard400-700Extremely hard700+

Vickers Hardness: 74.2 HV

  • The Brinell equivalent is approximately 70 HB, which is an indication of resistance to permanent indentation under a larger ball indenter.
  • This hardness is below 200 HV, so the Rockwell C scale does not apply. Use Rockwell B (HRB) for softer materials.
  • The estimated tensile strength is about 245 MPa (36 ksi), based on the Tabor approximation for steel. This estimate is less reliable for non-ferrous metals and cast irons.

Next stepFor very soft materials, consider the Brinell test with a 2.5 or 5 mm ball, which gives a more reliable reading at low hardness.

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