# Metal Hardness Formula & Calculator

## BHN (Brinell Hardness Number) Calculation

D - Steel ball diameter (mm)
d - Depression diameter (mm)

BHN (Brinell Hardness Number) metal hardness calculator - formula & step by step calculation to measure the resistance of solid materials permanent shape change when a compressive force is applied. BHN = 2P/πD(D - &radi;(D2 - d2)). Load P in kgf, steel ball diameter D in mm & changed diameter d in mm are the key terms of this calculation.

## Formula

In mechanical engineering, the below mathematical formula is used to calculate the metal resistance against permanant shape change due to compressive forces.

In the field of mechanical engineering, sometimes it's important to analyse the strength of materials. The above formula & step by step calculation may useful for users to understand how the values are being used in the formula, however, when it comes to online for quick calculations, this BHN (Brinell Hardness Number) metal hardness calculator helps the user to perform & verify such calculations as quick as possible.

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