| Primary value | 1.5 to 2.0 % of concrete volume (≈ 120–160 kg / m³) |
| Applies to | Simply-supported and continuous RCC beams · Plinth, tie and floor beams · Estimation of steel quantity at tender stage |
| Exceptions | IS 456 minimum tension steel → 0.85 × bd / fy |
| IS 456 maximum (singly reinforced) → Pt,lim depends on grade — ~2.76% for M25 + Fe500 | |
| IS 456 maximum total reinforcement → 4% of cross-section | |
| Heavily loaded transfer beam → 2.5–3.0% | |
| Measured as | Total steel volume (main bars + stirrups) ÷ concrete volume × 100. By weight: 2% = 157 kg of steel per m³. |
| Source | IS 456 — Clause 26.5.1 ✓ Verified |
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Beams carry 2–3× the load intensity of slabs and need correspondingly more steel. 1.5–2.0% is the typical residential range — below 1.5% suggests the beam is over-sized in concrete; above 2.0% means concrete is under-sized and rebar is doing the work.
Estimators budget 150 kg/m³ for residential beams, climbing to 180 kg/m³ for commercial spans over 6 m. Stirrups alone account for ~25 kg/m³ — increasing to ~40 kg/m³ in seismic zone IV and V buildings under IS 13920 ductile detailing.