Brinell hardness
BHN = 2P / (pi D (D - sqrt(D^2 - d^2)))
Material properties calculator
Brinell Hardness Calculator
Find BHN for material testing and hardness comparison.
Calculator
Enter material values
Select units beside each input. Results update automatically as soon as enough values are entered.
Result
About this calculator
How it works
The Brinell hardness number is based on the test force divided by the curved surface area of the indentation.
Formulas
Formulas used
Worked example
Example calculation
Brinell hardness
BHN = 2 x 3000 / (pi x 10 x (10 - sqrt(10^2 - 4^2))) = 229
Guide
How to use this calculator
- Enter the measured material, load, geometry, strain, or thermal values requested by the calculator.
- Select the units beside each input where a unit menu is shown.
- Use the highlighted result for the main property, then review the supporting values for context.
Reference
What the results mean
Brinell hardness
Indentation hardness value in kgf/mm2.
Indentation ratio
Indent diameter divided by ball diameter, useful for checking whether the test geometry is reasonable.
Assumptions and limits
Before using the result
- Inputs are treated as representative engineering values from a test, datasheet, or early design estimate.
- Material properties vary with grade, heat treatment, temperature, strain rate, moisture, manufacturing route, and test method.
- Use verified material data, applicable standards, safety factors, and qualified engineering judgement for final design or failure analysis.
FAQ
Brinell Hardness Calculator questions
Can I use different units?
Yes. Select the unit beside each input. Values are converted internally before the calculation is performed.
Are these material results suitable for final design?
Use these results for education, screening, and early design checks. Final work should use verified test data, relevant standards, safety factors, and project-specific conditions.
Why can material property values vary?
Material properties depend on alloy, grade, heat treatment, temperature, test method, manufacturing route, and data source.
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