RCC Calculator – Concrete & Reinforcement Estimator

Calculate concrete volume, cement, sand, aggregate, water, and steel quantity for slabs, beams, columns, and footings instantly with this RCC Calculator.

Input Parameters

Typical values: Slab 1%, Beam 2%, Column 2.5%, Footing 0.8%
Enter dimensions and click Calculate to see results.
Calculation Formulas
Concrete Volume

Volume = Length × Width × Height

With waste factor: Volume × (1 + Waste%)

Cement Quantity

Cement = (Volume × Cement Part × 1.54) / Sum of Mix Ratio

1 bag of cement = 50 kg ≈ 0.035 m³

Sand & Aggregate

Sand = (Volume × Sand Part × 1.54) / Sum of Mix Ratio

Aggregate = (Volume × Aggregate Part × 1.54) / Sum of Mix Ratio

Water Quantity

Water (liters) = Cement (kg) × Water-Cement Ratio (0.5 typical)

Steel Quantity

Steel (kg) = Volume (m³) × 1000 × Steel Percentage (%)

Typical steel percentages:

  • Slab: 1%
  • Beam: 2%
  • Column: 2.5%
  • Footing: 0.8%
Construction Tips
General guidelines for RCC construction
Material Estimation Tips
  • Always add 1.54 as dry volume conversion factor (wet to dry concrete volume)
  • For M20 mix → Use 1:1.5:3 (Cement:Sand:Aggregate) ratio
  • Standard water-cement ratio is 0.5 for general work
  • Increase volume by 5–10% to cover material wastage
  • For high-strength concrete, reduce water-cement ratio to 0.4-0.45
Steel Reinforcement Tips
  • Use proper cover (25-40mm) for reinforcement to prevent corrosion
  • Lap length should be 50 times the bar diameter
  • For slabs, main reinforcement should be placed at the bottom
  • Use chairs or spacers to maintain proper positioning of reinforcement
  • For seismic zones, increase steel percentage by 0.5-1%
Concrete Placement Tips
  • Pour concrete within 30 minutes of mixing
  • Use vibration to remove air bubbles and ensure proper compaction
  • Maintain proper curing for at least 7 days (28 days for full strength)
  • Avoid pouring concrete in extreme weather conditions
  • Use slump test to check workability (75-100mm for beams/slabs)
Reference Tables
Standard Concrete Mixes
Grade Mix Ratio (C:S:A) Strength (MPa) Common Use
M10 1:3:6 10 Non-structural, levelling courses
M15 1:2:4 15 Flooring, PCC
M20 1:1.5:3 20 General RCC structures
M25 1:1:2 25 Columns, Beams, Heavy structures
M30 1:0.75:1.5 30 Heavy-duty industrial floors
Typical Steel Percentages
Element % of Concrete Volume Typical Bar Sizes
Slab 0.8-1.2% 8-12mm
Beam 1.5-2.5% 12-25mm
Column 2.0-3.0% 12-32mm
Footing 0.5-1.0% 10-20mm
Retaining Wall 0.8-1.5% 10-16mm
Material Properties
Material Density Unit Weight
Cement 1440 kg/m³ 50 kg/bag
Sand (dry) 1600 kg/m³ 1.6 kg/liter
Aggregate (20mm) 1520 kg/m³ 1.52 kg/liter
Steel 7850 kg/m³ 7.85 kg/liter
Fresh Concrete 2400 kg/m³ 24 kN/m³

Last Updated: July 3, 2025

Fixed few issues!