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Tensile Strength From Hardness Calculator

Work out tensile strength from hardness instantly with clear inputs, formula shown and shareable results.

About Tensile Strength From Hardness Calculator

Both hardness and tensile strength measure resistance to plastic deformation, so they correlate closely within a material family. For carbon and alloy steels tensile strength in megapascals is about 3.45 times the Brinell number; cast iron uses a lower factor because graphite flakes reduce tensile strength without reducing hardness.

Formula

Tensile estimate

UTS MPa = factor x HB

factor
3.45 steel, 3.20 austenitic stainless, 2.50 grey cast iron

Worked example

With the default values below, Tensile Strength From Hardness Calculator returns Estimated tensile strength of 690. Change any input above and every figure here is recalculated in your browser.

Inputs used

Brinell hardnessminimum 1 HB
200 HB
Material groupone of Carbon and alloy steel — 3.45, Austenitic stainless — 3.20, Grey cast iron — 2.50
Carbon and alloy steel — 3.45

Results

Estimated tensile strength
690 MPa
Tensile strength in ksi
100.1 ksi
Indicative yield strength
414 MPa
Tensile strength in psi
100,076 psi

Step by step

  1. 1Values used
  2. 2Tensile estimate
  3. 3Estimated tensile strength= 690 MPa
  4. 4Tensile strength in ksi= 100.1 ksi
  5. 5Indicative yield strength= 414 MPa
  6. 6Tensile strength in psi= 100,076 psi

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Preliminary estimate only. Hardness-to-strength correlations are indicative; do not substitute them for tensile testing in design or certification.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Preliminary estimate only. Hardness-to-strength correlations are indicative; do not substitute them for tensile testing in design or certification.

Frequently Asked Questions

How is the Tensile Strength From Hardness figure worked out?

UTS MPa = factor x HB. Both hardness and tensile strength measure resistance to plastic deformation, so they correlate closely within a material family.

Can I use this to certify material?

No. It is a screening estimate for sorting or process control. Certification requires an actual tensile test on a specimen taken to the material specification.

What values do I need to enter?

This calculator takes 2 inputs: Brinell hardness, Material group. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.

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