How to Calculate Ready Mix Concrete Requirements for Your Project

Accurate concrete quantity estimation is crucial for project planning and budgeting. Here's how to calculate your RMC requirements.

Basic Formula

Volume = Length × Width × Height

Result in cubic meters (m³)

Calculating for Different Elements

Slabs

Volume = Length × Width × Thickness
Example: 10m × 8m × 0.15m = 12 m³

For a typical residential slab:

• Living room (6m × 5m × 0.125m) = 3.75 m³
• Bedroom (4m × 4m × 0.125m) = 2.0 m³
• Kitchen (3m × 3m × 0.125m) = 1.125 m³

Columns

Volume = Cross-section area × Height × Number of columns
Example: 0.3m × 0.3m × 3m × 20 = 5.4 m³

Common column sizes:

• 230mm × 230mm - Residential
• 300mm × 300mm - Standard
• 450mm × 450mm - Heavy duty

Beams

Volume = Width × Depth × Length × Number of beams
Example: 0.23m × 0.45m × 4m × 10 = 4.14 m³

Footings

Volume = Length × Width × Depth
Add for each footing type

Example calculations:

• Isolated footing: 1.5m × 1.5m × 0.4m = 0.9 m³
• Strip footing: 0.6m × 20m × 0.3m = 3.6 m³

Important Considerations

Wastage Factor

Add 2-5% extra for:

• Spillage during pouring
• Over-excavation
• Uneven surfaces

Pump Concrete

If using pump concrete, inform the supplier as it affects:

• Mix design (smaller aggregates)
• Slump requirements
• Pricing

Pro Tips

1. Always round up your estimates
2. Order slightly more than calculated
3. Plan for continuous pouring
4. Consider access and placement time
5. Discuss with your RMC supplier

Sample Project Calculation

For a two-bedroom house:

Using Our Calculator

Use our free RMC calculator tool to estimate your requirements. Just enter dimensions and get instant estimates with pricing.

Conclusion

Accurate quantity estimation saves money and prevents delays. Always consult with professionals and your RMC supplier for complex projects.