RCC Quantity Calculator

Reinforced cement concrete (RCC) combines concrete, which resists compression, with steel bars, which resist tension. Estimating an RCC member means calculating two things: the concrete volume and its ingredients, and the weight of reinforcement steel. This calculator gives both for common structural members.

How to use it

1. Choose the member type: slab, beam, column or footing.
2. Enter its dimensions and the number of identical members.
3. Choose the concrete grade, such as M20 or M25.
4. Enter the steel percentage, or accept a typical value for the member type.
5. Read the concrete volume, cement bags, sand, aggregate and steel in kilograms.

How it is calculated

• Concrete volume = length × width × depth × number of members.
• Dry volume = wet volume × 1.54, then split by the mix ratio, such as 1:1.5:3 for M20.
• Steel weight = concrete volume × steel percentage × 7850 kg/m³ (density of steel).

Typical steel percentages

• Slabs: about 0.7 to 1% of concrete volume.
• Beams: about 1 to 2%.
• Columns: about 0.8 to 4% (IS 456 minimum 0.8%, maximum 6%).
• Footings: about 0.5 to 0.8%.

Worked example

Four columns, each 0.3 × 0.45 × 3.0 m, in M20: volume = 4 × 0.405 = 1.62 m³. Dry volume = 2.49 m³; cement = 2.49 / 5.5 = 0.45 m³ = 13 bags; sand = 0.68 m³; aggregate = 1.36 m³. With 2% steel: 1.62 × 0.02 × 7850 = 254 kg.

Notes

• Percentages give a quick estimate; final steel quantities come from the bar bending schedule based on structural drawings.
• Add wastage: about 2 to 5% for concrete and 3 to 5% for steel.