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Beam/Slab/Column Rebar Calculator (GB 50010)
Member type
Concrete grade
Rebar grade
Section width Millimeter(mm)
Section height Millimeter(mm)
Slab thickness Millimeter(mm)
Cover depth Millimeter(mm)
Assumed bar diameter Millimeter(mm)
Design moment M kN·m
Design shear V kN
Axial force N kN
Column moment M kN·m
Design As: - mm²
Calculated As: - mm²
Reinforcement ratio: -
Effective depth h0: - Millimeter(mm)
Relative height ξ: -
Minimum rebar area: - mm²
Maximum rebar area: - mm²
Suggested bars: -
Shear note: -
Check result: -
Notes: -
Pass Fail 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.