Hardness Conversion Calculator

¹⁾ Standard Hardness Conversion for metals acc. ASTM E 140 - 97, September 1999, Conversion for Non-Austenitic Steels, Table 1.

The accuracy of the conversion depends on the accuracy of the provided data and the resulting curve-fits.

²⁾ Indentation hardness is not a single fundamental property but a combination of properties, and varies with the type of test.

The modulus of elasticity and the depth of indentation influence conversions.

Therefore separate conversion tables are necessary for different materials.

³⁾ Brinell Hardness numbers in parentheses are outside the range (HB>630).

This limit is set to avoid errors introduced by the deformation of the ball indenter itself.