Shear Stress Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
Enter Values
How to use this calculator
- Enter the shear force V acting across the section, in kN.
- Enter the cross-section area A resisting the shear, in mm².
- Read the average shear stress τ in MPa.
How it works
The Shear Stress Calculator finds the average direct shear stress on a section: the shear force divided by the area carrying it.
τ = V / A. With V in newtons and A in mm², the result is in MPa (N/mm²). This is the mean stress — the real peak shear can be higher (for example about 1.5× the average in a solid rectangular beam web).
Worked example
50 kN over 500 mm². τ = 50,000 N ÷ 500 mm² = 100 MPa average shear stress.
Frequently asked questions
Is this the maximum shear stress?
No — it is the average. In bending members the shear stress varies across the depth and peaks at the neutral axis; for a rectangular section the peak is about 1.5× the average.
Can I use these results for final design?
No. These calculators are for first-pass sizing, checking and learning. They assume ideal supports, static loads and elastic behaviour, and they don't apply load factors, member capacity, buckling or connection checks. Always verify against the relevant design code (e.g. AS 4100, AS 1170, Eurocode) and have a qualified engineer sign off structural work.
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Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.