RC Beam Designer

Flexural design and analysis of reinforced-concrete beams to NSCP 2015 / ACI 318-14 strength design. Choose a section type (singly, doubly, or T-beam) and an operation — Design to size the steel from a required moment M_u, or Analyze to find the capacity φM_n from a given steel area. Get a bar-selection result, full worked steps, and a labelled cross-section drawing.

⭐ Free to use · Balance … EP

① Section type

② Operation

③ Materials

Concrete f′_c (MPa)

Steel f_y (MPa)

④ Geometry (mm)

Width b (mm)

Effective depth d (mm)

From the extreme compression fibre to the tension-steel centroid.

Overall depth h (mm) (drawing, optional)

Optional — for the section drawing only.

Effective flange width b_e (mm)

Slab/flange thickness h_f (mm)

Web width b_w (mm)

Effective depth d (mm)

⑤ Design moment

Factored moment M_u (kN·m)

The ultimate (factored) bending demand to be resisted.

Tension steel A_s (mm²)

⑥ Bar selection

Bar diameter d_b (mm)

The app reports the whole number of bars n needed so that the provided steel ≥ the required steel.

🧱 Result

—

Section · steel · capacity

Summary

Worked solution

⚠️ Preliminary design only. This sizes flexural steel by strength design (NSCP 2015 / ACI 318-14). It does not check shear, bar spacing / development, deflection, crack control, or detailing. Confirm every member by full structural design and verify against the governing code edition before use.