Rockwell to Brinell Hardness Conversion Calculator

Material hardness is measured on various scales including Rockwell, Brinell (HB), and Vickers (HV). Each scale uses a different indenter and load, so conversion tables are used to compare values.

To use the Rockwell to Brinell Hardness Conversion Calculator, enter your Hardness Value to Convert, Convert From Scale, Convert To Scale. The calculator instantly computes Converted Hardness Value, Approximate Tensile Strength and more. Results update in real time as you change any input — no submit button needed.

How to Use This Calculator

Enter your Hardness Value to Convert (e.g. 60), Convert From Scale — choose from Rockwell C (HRC) — Steel & Hard Alloys, Rockwell B (HRB) — Soft Steel & Aluminium, Brinell (HB / BHN), and Convert To Scale — choose from Brinell (HB / BHN), Vickers (HV), Rockwell C (HRC). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

HRC to HB (approx): HB ≈ HRC × 10 - 100 (for HRC > 40)

HV to HB: HB ≈ HV × 0.95

Tensile Strength (MPa) ≈ HB × 3.45

Worked Example

Convert HRC 60 (hardened tool steel) to Brinell HB and tensile strength.

• HB ≈ 60 × 10 - 100 = 500 HB.

• Approximate Tensile Strength: 500 × 3.45 = 1,725 MPa.

• Scale Applied: HRC to HB.

Understanding Your Result

Unit conversions are exact by definition within a given measurement system (e.g., 1 km = exactly 1,000 m). Cross-system conversions (metric to imperial) use defined exchange factors: 1 inch = exactly 2.54 cm; 1 pound = 0.45359237 kg. Round your converted result to match the precision of your original measurement — expressing more decimal places than your input justifies implies false accuracy. For regulatory, legal, or safety-critical applications, verify which measurement system is required by the applicable standard.