RSJ Beam Calculators Hub
Free planning tools for size, load, weight, deflection, span lookup, padstones, bearing length and cost. Confirm everything with a chartered structural engineer and Building Control before you cut a wall.
Beam Size Calculator
Compare calculated deflection and elastic stress for listed UB sections at your entered span and service load.
Open Calculator →Load Capacity Calculator
Calculate service-load reactions, moment, elastic stress and deflection. No safe-load verdict is provided.
Open Calculator →Weight Calculator
Convert section and length into total kg, tonnes and self-weight in kN for delivery and crane planning.
Open Calculator →Deflection Calculator
Estimate mid-span deflection under uniform service load and compare with a target ratio you choose.
Open Calculator →Cost Calculator
Total your supplier quote and entered project costs in GBP or PLN, with delivery and editable VAT.
Open Calculator →Span Table Lookup
Compare listed sections at your exact support-centre span and uniform service load.
Open Calculator →Padstone Calculator
Explore bearing pressure from an entered reaction and contact area; this does not size a padstone.
Open Calculator →Bearing Length Calculator
Convert clear span into order length by adding bearing at each end.
Open Calculator →Professional Engineering Required
These calculators provide estimates only. All structural calculations must be verified by a chartered structural engineer (CEng, MIStructE). Actual structural design must account for deflection limits, lateral stability, local effects, fire protection, and building code requirements.
Never proceed with structural work without:
- Full structural engineer calculations and drawings
- Building Control approval
- Professional indemnity insurance coverage
- Qualified installation by experienced contractors