Enter the Brinell Hardness into the calculator to determine the Rockwell Hardness.

Brinell To Rockwell Formula

The following formula is used to calculate the Rockwell Hardness from Brinell Hardness.

R = 130 - (30 * sqrt(B))


  • R is the Rockwell Hardness
  • B is the Brinell Hardness

To calculate the Rockwell Hardness from Brinell Hardness, multiply the Brinell Hardness by 30 and find the square root of the result. Then, subtract this result from 130.

What is Brinell To Rockwell?

A Brinell to Rockwell conversion is a method used to convert the hardness value of a material from the Brinell hardness scale to the Rockwell hardness scale. Both scales are used to measure the hardness of materials, but they use different testing methods and are typically used for different types of materials. The conversion is often necessary because certain industries or applications may prefer or require one scale over the other.

How to Calculate Brinell To Rockwell?

The following steps outline how to calculate the Brinell To Rockwell conversion using the formula: R = 130 – (30 * sqrt(B)).

  1. First, determine the Brinell hardness (B).
  2. Next, substitute the value of B into the formula: R = 130 – (30 * sqrt(B)).
  3. Next, calculate the square root of B.
  4. Next, multiply the square root of B by 30.
  5. Next, subtract the result from 130.
  6. Finally, calculate the Rockwell hardness (R).
  7. After inserting the value of B and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Brinell hardness (B) = 200