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Vickers Hardness Number Calculator.

Calculate Vickers hardness from test force and mean diamond-indenter diagonal.

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Results update as you type.

Hardness: 222.528 kgf/mm²

Hardness

0.000000kgf/mm²
Hardness: 2,182.254211 MPa

Hardness

0.000000MPa

Results update automatically as you type.

Use Cases

Material hardness testing

Use this calculator to quickly determine the Vickers hardness of metals, ceramics, and other materials from test data.

Example: Enter a test force of 10 kgf and a mean diagonal of 0.2 mm to get an HV of 463.6.

Frequently Asked Questions

What is the Vickers hardness number (HV)?
The Vickers hardness number is a measure of a material's hardness, determined by indenting the surface with a diamond pyramid and calculating the ratio of the applied force to the surface area of the indentation.
How is the Vickers hardness number calculated?
HV is calculated using the formula HV = 1.8544 × F / d², where F is the test force in kgf and d is the mean diagonal of the indentation in mm. This calculator uses that formula.
What units are used in this calculator?
The test force must be entered in kilograms-force (kgf) and the mean diagonal in millimeters (mm). The result is the Vickers hardness number (HV).

Tips & Common Mistakes

Tips

  • Ensure the test force is in kgf; if you have newtons, convert by dividing by 9.80665.
  • Measure the mean diagonal accurately; small errors in diagonal significantly affect HV.
  • Use a consistent indentation size relative to the material's microstructure for reliable results.

Common Mistakes to Avoid

  • Using the wrong unit for force (e.g., newtons instead of kgf) without conversion.
  • Entering the diagonal in micrometers instead of millimeters; convert by dividing by 1000.
  • Using the maximum diagonal instead of the mean of the two diagonals.

Last updated: August 13, 2026