RSJ Beam Calculators Hub
Three free professional tools to help you size, check and budget your RSJ beam project. Use them for planning, then confirm everything with a structural engineer.
Beam Size Calculator
Find the right RSJ beam size for your span and load width. Ideal for wall knock-throughs, extensions and loft openings.
Open Calculator →Load Capacity Calculator
Check bending strength and deflection limits for any beam section and span up to 8 metres.
Open Calculator →Cost Calculator
Estimate the total project cost in the UK or Poland, including steel, delivery, engineer fees and installation.
Open Calculator →Essential Site Equipment
Professional tools recommended for structural work
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