🛠️ Hardness Conversion Calculator
Compare approximate hardness values across popular scales.
Useful for metallurgists, machinists, and geologists translating hardness data from different test methods.
Range 1-10
Brinell Hardness (HB)
460
Vickers Hardness (HV)
600
Rockwell C (HRC)
39
How to Use This Calculator
Choose the input scale
Select the hardness test method you have—Mohs, Brinell, Vickers, or Rockwell C.
Enter the measured value
Type the reported hardness value. The calculator interpolates within common ranges.
Review equivalent hardness
Copy approximate values in other scales to compare specs or communicate with different teams.
Formula
Conversions rely on linear interpolation between widely published hardness reference tables.
Each scale is matched against representative materials (e.g., Mohs minerals versus steel test blocks).
Use these results as estimates—laboratory testing is required for certification.
Use the formula breakdown to confirm the calculation logic or perform the conversion manually if needed.
Full Description
Multiple hardness tests exist because materials behave differently under indentation, scratching, or rebound methods. Converting between them helps when you only have data from one test but need to reference another specification.
This calculator uses a blended reference table with linear interpolation. It works well for quick estimates, engineering communication, and educational purposes.
For precise quality control, always rely on direct measurements under the required standard (ASTM, ISO, etc.). Use this tool to anticipate the order of magnitude before organizing formal tests.
Frequently Asked Questions
How accurate are these conversions?
They are approximate. Real conversions depend on material composition and processing. Use laboratory tests for certification.
Why isn’t Rockwell B included?
Rockwell B targets softer metals and requires a different reference table. Extend the source table if you need it regularly.
Can I enter values outside the suggested range?
Values are clamped to the supported table range to avoid unrealistic extrapolations. Expand the dataset for extreme cases.
Does Mohs apply to metals?
Mohs is primarily a scratch hardness scale for minerals. Metals often use Brinell, Vickers, or Rockwell instead.