Ironworkers

Simple Beam Deflection Estimator

Estimate simple-span beam deflection with a center point load.

Estimated deflection0.052"L/360 limit: 0.333"
Deflection ratioL/23040
Span120 in
FormulaPL³ / 48EI
Status vs L/360OK

Engineering estimate only. Do not use this as a stamped structural design. Real beams need load cases, supports, connections, lateral bracing, code checks, and a qualified engineer where required.

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How to use this tool

Simple Beam Deflection Estimator guide

Estimate simple-span beam deflection with a center point load. Enter the known field measurements and use the result as a fast estimate or layout reference.

Always verify the print, code requirements, equipment manual, material specification, site conditions, and qualified trade judgment before using calculator results on a real job.