RCC Design Calculator (IS 456)

RCC Design Calculator (IS 456) — Professional Structural Design Tool for Civil Engineers

RCC Design Calculator is a comprehensive structural engineering app for designing Reinforced Cement Concrete elements as per Indian Standards IS 456 : 2000 and IS 13920 : 2018.

Built for practicing Civil & Structural Engineers, students, and site professionals — all calculations follow Bureau of Indian Standards (BIS) codes using Limit State Method.

MODULES AVAILABLE:
✅ Singly/Doubly Reinforced Beam Design (Singly → Doubly)
Enter your section and moment — the app automatically identifies whether singly or doubly reinforced design is needed and completes the full design accordingly. No manual switching required.
- Singly Reinforced Beam
Complete limit state flexure design with tension steel optimised for the given moment. Shear design with stirrup spacing, development length, and deflection check. Supports dual bottom bar diameters and intermediate top bars.
- Doubly Reinforced Beam
Automatically triggers when applied moment exceeds the limiting moment of a singly reinforced section. Computes extra moment, compression steel requirement (Asc), and verifies actual moment capacity. Full shear and deflection check included.
✅ Rectangular Column Design
Short and long column classification, biaxial bending check using IS 456 Cl. 39.6, IS 13920 seismic checks, tie leg calculation, and bar spacing verification. Live cross-section sketch with actual bar arrangement.
✅ One-Way Slab Design
Factored moment and shear per IS 456 Table 12 & 13, Ast using IS 456 Annex G quadratic formula, deflection check with modification factors MF1 and MF2, maximum bar diameter check.
✅ Two-Way Slab Design
IS 456 Table 26 moment coefficients for all 9 edge conditions. Separate Ast design in both X and Y directions, deflection check with MF1, and maximum bar diameter check for both directions.
✅ Isolated Footing Design
Handles factored axial load Pu with biaxial moments Mux and Muy. Upward pressure with eccentricity, one-way shear in both directions, punching shear check, development length verification, and 13 IS code checks.

KEY FEATURES ACROSS ALL MODULES:

- IS 456 : 2000 + IS 13920 : 2018 code checks with automatic PASS / FAIL results
- IS 13920 Ast,min = 0.24√fck/fy·b·d and Ast,max = 2.5%·bD applied throughout
- Ast required using IS 456 Annex G-1.1b closed-form quadratic formula
- L/d deflection check with Modification Factors MF1 (tension steel) and MF2 (compression steel)
- Live cross-section sketches with dimension markers, stirrup/tie details, and legends
- Multi-leg stirrups: 2-legged, 3-legged, and 4-legged as per IS 13920
- Development length as per IS 456 Cl. 26.2
- Bar spacing checks as per IS 456 Cl. 26.3
Support condition selector: Simply Supported / Continuous / Cantilever
- Large readable fonts — designed for field use on mobile screens

DESIGNED FOR:

- Civil & Structural Engineers (practicing professionals)
- B.Tech / M.Tech Civil Engineering students
- GATE, ESE, and State PSC exam preparation
- Site engineers and project consultants
- Design office professionals

FEATURES

- All calculations strictly follow Bureau of Indian Standards (BIS) codes.
- No internet required for calculations.
- Free to use.