Is this tool free to use?

Yes, it's a free web-based calculator—no login required.

Can I use it on mobile?

Yes. It runs in modern mobile browsers and supports offline use when added to home screen.

Hardness Conversion Calculator

Convert between Rockwell (HRC/HRB), Brinell (HB), and Vickers (HV) hardness scales instantly. Use this tool for quick equivalence checks across drawings, supplier datasheets, and QA reports. Note that conversions are approximate and alloy-dependent.

Rockwell C (HRC)

Typical for hardened steels. Valid conversion range approx. HRC 20–60.

HRC

Rockwell B (HRB)

Typical for softer steels and nonferrous metals. Valid conversion range approx. HRB 70–100.

HRB

Brinell (HB)

Widely used for castings and wrought metals. Conversions valid within the ranges covered by HRC/HRB anchor points.

Vickers (HV)

Micro/macro‑hardness; broad applicability. Converted by matching nearest reference curve.

HRC

—

HRB

—

Disclaimer: No single exact conversion exists for all alloys. Use engineering judgment and, where necessary, test directly to the target scale.