Beam / Slab / Column Rebar Calculator (GB 50010)
Singly reinforced flexural estimate per GB 50010: required As, ratio checks and bar suggestions (Φd@s for slabs).
- Choose beam / slab / column and material grades
- Beam: b×h and M (optional V tip); slab: thickness and M per meter; column: N and optional M
- αs = M/(fc b h0²), ξ = 1−√(1−2αs), As = fc b ξ h0/fy
- Compare with ρmin/ρmax; column uses max(ρminA, flexure As)
Preliminary only—final drawings need a licensed engineer. Runs locally in your browser.