Brinell Hardness Number (BHN) Calculator

Calculate Brinell Hardness Number (BHN)

kgf
Enter the force applied during the test (e.g., 500, 1500, 3000 kgf).
mm
Diameter of the spherical indenter (e.g., 1, 2.5, 5, 10 mm).
mm
Average diameter of the resulting permanent indentation.
Quickly determine the Brinell Hardness Number (BHN) for various materials. Our user-friendly online calculator simplifies the complex formula, allowing engineers, metallurgists, and students to accurately calculate material hardness based on test load and indentation diameter. Get precise results fast and efficiently.

Formula:

The Brinell Hardness Number (BHN) is a measure of the indentation hardness of a material. It is calculated by applying a standard load (F) to a sphere of a given diameter (D) for a specified time and then measuring the diameter of the resulting indentation (d).

The formula for Brinell Hardness Number (BHN) is:

BHN = (2 ⋅ F) / (π ⋅ D ⋅ (D - √(D² - d²)))

  • F = Applied load (in kgf)
  • D = Diameter of the indenter (in mm)
  • d = Diameter of the indentation (in mm)
  • π = Pi (approximately 3.14159)

This formula determines the hardness by relating the applied test force to the spherical surface area of the indentation.

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