This span-to-depth calculator estimates a beam depth that should satisfy deflection criteria based on suitable L/d rules from the design code. You can get to it by clicking the "Concrete Design/Check" button in the top toolbar, via the "Span to Depth Calculator" button in the "Concrete Manager" tool or via the "Concrete Span-to-Depth Calculators" option in the Design menu.
The calculations are done in accordance with AS3600:2018 clause 8.5.4 or IS456:2000 clause 23.2.
Refer also to the deflection diagrams in "Creating and editing concrete beams".
