Beam Span / Depth Check
Serviceability depth check against IS 456 span-to-depth limits.
Inputs
Results
Enter your values, then press Calculate Now to evaluate the output.
Guide — Beam Span / Depth Check
The span to depth calculator below follows standard Indian construction practice and the relevant IS-code conventions. Enter the site dimensions exactly as measured, press Calculate Now, then refine the quantities line by line in the live sheet before you export.
IS 456 clause 23.2 controls deflection indirectly through basic span-to-effective-depth ratios: 7 for cantilevers, 20 for simply supported and 26 for continuous members, all for spans up to 10 m.
The basic ratio is adjusted by a modification factor for tension reinforcement (up to about 1.4 for lightly stressed sections), compression reinforcement, and flanged beams.
Passing the ratio check satisfies the code without an explicit deflection calculation. For spans above 10 m, or where finishes are deflection-sensitive, run the full short-term plus long-term deflection computation.
Treat every output as an indicative pre-tender estimate. Site conditions, wastage allowances, specification changes and local market rates all move the final figure, so validate against your drawings and approved rate analysis before procurement.
Master Measurement Sheet
| Sr. No. | Description | Unit | NOS 1 | NOS 2 | L | B | D | QTY | Action |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 1.000 |
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About the Beam Span / Depth Check
This tool is built for site engineers, quantity surveyors, contractors and property investors who need dependable numbers fast. Every input is reactive — changing a single field instantly recomputes the full output set, so you can run sensitivity checks on dimensions, grades and rates before committing to an estimate.
Keep unit consistency in mind: metric inputs (metres, square metres, cubic metres) produce metric outputs, with imperial and Indian trade units shown alongside where they are commonly used on site.