Brinell Number Formula

Equation for calculate brinell number is,

$\mathrm{BHN}=0.102·\frac{2·P}{\pi ·D·(D-\sqrt{D^2-d^2})}$

where,
BHN = Brinell Hardness Number
P = applied load in kilogram-force
D = diameter of indenter
d = diameter of indentation