The Rockwell Hardness (HRC / HRB) Calculator is a reliable online tool designed to calculate Rockwell hardness values quickly and accurately based on permanent indentation depth measurements. Supporting both Rockwell C (HRC) and Rockwell B (HRB) scales, this calculator helps engineers, material testing professionals, and quality control inspectors evaluate the hardness of metals and alloys. Whether you are testing hardened steel, stainless steel, aluminum, brass, or other engineering materials, the Rockwell Hardness (HRC / HRB) Calculator simplifies hardness calculations, supports material selection, and improves efficiency in manufacturing, heat treatment, and quality control applications.

Test Inputs

Choose the scale, then enter the depth measurement.

Indenter
—
Preliminary force F₀
—
Total force F
—
Scale constant N
—
Formula
—
Depth input mode
The permanent increase in depth relative to the reference position under the preliminary force, measured after the additional force is removed. It is not the total depth from the original surface.
Example: 0.10 mm (= 100 µm). Changing the unit converts the value.