Expert Guide

Babu

Steel / Rebar Calculators

Steel Quantity for Slab – Weight Estimator

Quality Inspector

Kaka

Estimation of total reinforcement steel needed for a slab based on its volume and standard thumb-rule percentages.

📐 Formula & Method

Weight = Concrete Volume × (Percentage / 100) × 7850 kg/m³ (Density of Steel).

Weight (kg) = Volume × % × 78.5

📋 Worked Example

For 5m × 4m × 0.15m slab with 1% steel:
• Volume = 3 m³
• Weight = 3 × 0.01 × 7850 = 235.5 kg

❓ Frequently Asked Questions

How much steel is used in a slab?

Typically 80kg to 100kg of steel is used per cubic metre of concrete in a standard residential slab.