Which hardness scales does the converter support?

It supports Vickers HV, Brinell HB, Rockwell C HRC, and Rockwell B HRB.

Which materials are supported?

The tool supports carbon/alloy steel, austenitic stainless steel, and cartridge brass.

What input value should I enter?

Enter a hardness value in the selected input scale, within the ASTM E140 range for the chosen material.

Why does a result show out of range?

That hardness scale does not apply to the calculated hardness band for the selected material.

Can these conversions be used for acceptance testing?

No. The results are indicative only and are not intended for acceptance testing under ASTM E140.

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Hardness Converter (HB / HV / HRC / HRB)

Convert between Brinell (HB), Vickers (HV), and Rockwell (HRC / HRB) hardness via ASTM E140 tabulated data with linear interpolation. Three material classes: carbon/alloy steel (HV 100–960), austenitic stainless (HV 100–600), and cartridge brass (HV 40–200). Any input scale produces all the others; a scale that does not apply in the current hardness band returns 'out of range'. Indicative only — not for acceptance testing per ASTM E140.

Execution

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2 examples

Steel HV=200 → HB≈192, HRB≈92, HRC out of range

Vickers 200 on carbon/alloy steel. Interpolation gives HB=192, HRB=92.0. HRC is undefined below ~240 HV (annealed / soft steel), so HRC reports out of range.

{"result":"Steel, input HV=200.0. HV=200.0, HB=192.0, HRC=out of range (valid for hardened steel, HV ≥ 240), HRB=92.0. ASTM E140 linear interpolation; indicative only, not for acceptance testing.","metadata":{"input":{"material":"steel","inputScale":"HV","value":200},"result":{"material":"steel","HV":200,"HB":192,"HRC":"out of range","HRB":92}}}

Steel HRC=30 → HV≈303, HB≈288, HRB out of range

Rockwell C 30 on hardened steel. Interpolation back to HV ≈ 303, then HB ≈ 288. HRB is undefined above ~240 HV, so HRB reports out of range.

{"result":"Steel, input HRC=30.0. HV=303.0, HB=288.0, HRC=30.0, HRB=out of range (valid for soft steel, HV < 240). ASTM E140 linear interpolation; indicative only, not for acceptance testing.","metadata":{"input":{"material":"steel","inputScale":"HRC","value":30},"result":{"material":"steel","HV":303,"HB":288,"HRC":30,"HRB":"out of range"}}}

Inputs

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4 options

SettingsAdjust formats, ranges, numbers, and modes.4

MaterialselectOptionalMaterial class — ASTM E140 provides separate conversion tables per material because hardness depends on work-hardening behaviour.Input ScaleselectOptionalValuenumberRequiredHardness value in the selected Input Scale. Must lie within the tabulated ASTM E140 range for the chosen material.Decimal PlacesnumberOptional

Result

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Samples

Hardness Converter (HB / HV / HRC / HRB)

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Convert soft steel from Vickers hardness

2. Convert hardened steel from Rockwell C

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