Vickers Hardness Conversion Calculator

Calculator Inputs

Formula Used

When you enter indentation data, the calculator first computes Vickers hardness using: HV = 1.8544 × F(kgf) ÷ d²(mm).

• F is the test load (converted to kgf if you enter newtons).
• d is the average indentation diagonal in millimeters.
• Then the tool converts HV to other scales using interpolated reference points.

How to Use

1. Select an input method: hardness value or indentation data.
2. If using a value, choose the input scale and enter the number.
3. If using indentation, enter the load, unit, and diagonal in mm.
4. Choose which output scales you want to display.
5. Press Convert; results appear above the form instantly.
6. Use Download CSV or Download PDF for reporting.

Vickers Hardness Conversion Guide

This page helps you translate hardness readings when reports use different scales. Enter a known value or compute HV from load and diagonal, then export results for job cards, audits, and comparison charts across materials, labs, and teams.

1) What HV really measures

Vickers hardness (HV) is based on a diamond pyramid indenter with a 136° angle. The test reports resistance to plastic deformation by relating the applied load to the indentation size. Because the geometry is fixed, HV values can span very soft alloys to hardened tool steels.

2) Indentation formula in this tool

When you choose the indentation mode, the calculator uses HV = 1.8544 × F(kgf) ÷ d²(mm). The constant 1.8544 comes from the indenter geometry and unit conversions. Smaller diagonals mean a higher HV, so careful microscope readings matter.

3) Why conversions are approximate

Hardness scales are not identical physics. Rockwell measures depth under minor and major loads, while Brinell uses a ball indenter and a larger impression. Two materials with the same HV can show different HRC or HBW, especially when microstructure changes.

4) Table interpolation for fast estimates

This calculator converts your input to HV first, then estimates HBW and Rockwell values using reference points and linear interpolation between them. Interpolation provides smooth results for reporting trends, comparing batches, or checking incoming certificates.

5) Typical working ranges

Common steels often fall between about 150 HV and 900 HV. The Rockwell C scale is usually meaningful for harder materials, so very low HV values may not map cleanly to HRC. Rockwell B is better for softer metals and low-carbon steels.

6) Tensile strength estimate

The tool also shows an optional ultimate tensile strength estimate derived from Brinell values. A widely used shop-floor rule for steels is UTS(MPa) ≈ 3.3 × HBW, and UTS(psi) ≈ 500 × HBW. Treat it as a screening number.

7) Good data entry practices

Use consistent units, record the test load, and average both diagonals before entering d. If your lab reports HV10, HV5, or HV0.5, the numeric HV can still be compared, but very different loads can reveal surface effects or thin coatings.

8) Best uses for the calculator

Use conversions for quick communication between teams, legacy drawings, and mixed-instrument shops. For acceptance criteria, always cite the governing standard and the material group, then confirm the official conversion table that matches your alloy and heat treatment.

FAQs

Can I convert HV to HRC for any metal?

Not reliably. Conversions depend on alloy family, microstructure, and heat treatment. The calculator gives a practical estimate using interpolated reference points, but for contractual limits you should use the official table that matches your material group.

Why does Rockwell show a dash sometimes?

Some HV ranges do not map cleanly to a given Rockwell scale. Very soft materials are better represented by HRB, while very hard materials use HRC. When your input is outside the supported range, the tool displays a dash.

How do I compute HV from indentation?

Choose the indentation option, enter the test load and the average diagonal in millimeters, then press Convert. The tool applies HV = 1.8544 × F(kgf) ÷ d², converting newtons to kgf automatically.

Is the tensile strength value accurate?

It is a screening estimate. The calculator derives tensile strength from the converted Brinell value using common shop rules for steels. Real tensile strength varies with alloy, temper, and test method, so confirm with material specifications.

What diagonal value should I enter?

Use the average of the two measured diagonals from the microscope reading. Record them carefully and ensure the surface is properly prepared. Small measurement errors in d can cause larger changes because the formula uses d squared.

Does the HV test load matter?

Yes. While HV values are often comparable across loads, thin coatings, rough surfaces, and work hardening can make results load-sensitive. If your report includes HV0.5, HV5, or HV10, keep the load consistent when comparing.

Can I export results for documentation?

Yes. After you convert, use Download CSV for spreadsheets or Download PDF for a quick report. Printing also works for attaching results to job travelers, inspection notes, or incoming material checks.