Hardness Conversion Calculator

Different hardness tests use different methods:

- Rockwell (HRC, HRB) measures penetration depth

- Brinell (HB) measures indentation diameter

- Vickers (HV) measures pyramid indentation

Because each test method is different, there is no exact formula to convert between them. All conversions are based on standard reference charts.

Formula:

No direct formula exists. Conversions are based on ASTM E140 standard tables and interpolation between known values.

Example:

For 36 HRC:

HB ≈ 330 – 350

HV ≈ 340 – 360

For 220 HB:

HRC ≈ 20 – 21

When to use this calculator:

Use this tool when comparing material hardness across different standards, especially in machining, heat treatment, and material selection.

Machining tip:

Always refer to the original hardness test when precision is critical. Converted values are approximate and should be used for estimation only.

Use these related machining calculators to improve accuracy and save time: