Shear Stirrup Spacing Calculator
Vertical stirrup spacing for the shear the concrete can't carry (IS 456).
Even when concrete alone suffices, minimum stirrups are mandatory — shear failures are sudden and diagonal. Closer stirrups near supports, where V peaks, is free strength.
Formula
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Shear Stirrup Spacing Calculator is a free stirrup spacing for structural engineers, fabricators and site engineers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Shear Stirrup Spacing Calculator
Vertical stirrup spacing for the shear the concrete can't carry (IS 456). The calculation implements V_us = V_u − τ_c·bd; s = 0.87f_y·A_sv·d/V_us (IS 456 cl. 40 — shear). Even when concrete alone suffices, minimum stirrups are mandatory — shear failures are sudden and diagonal. Closer stirrups near supports, where V peaks, is free strength.
How to use Shear Stirrup Spacing Calculator
- 1Enter Factored shear V_u in kN.
- 2Enter Width b in mm.
- 3Enter Effective depth d in mm.
- 4Enter Concrete shear strength τ_c in MPa (From IS 456 Table 19 (~0.5–0.75 typical)).
- 5Read Shear for stirrups V_us, Required spacing, Max spacing (0.75d/300) instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Shear Stirrup Spacing Calculator?
- ✓Implements the standard formula — V_us = V_u − τ_c·bd; s = 0.87f_y·A_sv·d/V_us
- ✓Reference cited on-page: IS 456 cl. 40 — shear
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Shear Stirrup Spacing Calculator use?+
It computes V_us = V_u − τ_c·bd; s = 0.87f_y·A_sv·d/V_us, per IS 456 cl. 40 — shear. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Even when concrete alone suffices, minimum stirrups are mandatory — shear failures are sudden and diagonal. Closer stirrups near supports, where V peaks, is free strength.
Can I use this for real structural design?+
It implements the exact textbook/code formula cited below the result and is ideal for sizing, checking and learning. Final designs should be verified by a qualified engineer against the full code with all load cases.
Is the Shear Stirrup Spacing Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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