Storey Drift Checker
Inter-storey drift ratio against the 0.004h seismic limit.
Drift limits protect partitions, glazing and P-ฮ stability โ not strength. A 'soft storey' announces itself here long before collapse calculations do.
Formula
Storey Drift Checker is a free story drift for structural engineers, fabricators and site engineers โ 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 Storey Drift Checker
Inter-storey drift ratio against the 0.004h seismic limit. The calculation implements drift = (ฮดแตข โ ฮดแตขโโ)/h โค 0.004 (IS 1893 cl. 7.11.1). Drift limits protect partitions, glazing and P-ฮ stability โ not strength. A 'soft storey' announces itself here long before collapse calculations do.
How to use Storey Drift Checker
- 1Enter Displacement at floor above in mm.
- 2Enter Displacement at floor below in mm.
- 3Enter Storey height in m.
- 4Read Drift ratio ฮ/h, Limit (0.004h) instantly โ no submit button needed.
- 5Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Storey Drift Checker?
- โImplements the standard formula โ drift = (ฮดแตข โ ฮดแตขโโ)/h โค 0.004
- โReference cited on-page: IS 1893 cl. 7.11.1
- โOne-click SI โ Imperial toggle โ values convert in place, physics stays in SI
- โBuilt-in engineering verdict flags out-of-range results instantly
- โRuns entirely in your browser โ nothing uploaded, free forever
Frequently asked questions
What formula does the Storey Drift Checker use?+
It computes drift = (ฮดแตข โ ฮดแตขโโ)/h โค 0.004, per IS 1893 cl. 7.11.1. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Drift limits protect partitions, glazing and P-ฮ stability โ not strength. A 'soft storey' announces itself here long before collapse calculations do.
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 Storey Drift Checker free to use?+
Yes โ 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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