Global Concrete Calculator
Professional-grade tool with localized cost estimation for calculating concrete materials needed for your construction projects
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Standard Concrete Mix Ratios
Below are the standard concrete mix ratios for various grades from ordinary to high-strength concrete:
| Grade | Mix Ratio (C:S:A) | Strength (MPa) | Typical Use |
|---|---|---|---|
| M5 | 1:5:10 | 5 | Non-structural work, bedding |
| M7.5 | 1:4:8 | 7.5 | Mass concrete, foundations |
| M10 | 1:3:6 | 10 | Light foundations, floorings |
| M15 | 1:2:4 | 15 | Pavements, general purpose |
| M20 | 1:1.5:3 | 20 | Reinforced concrete, beams |
| M25 | 1:1:2 | 25 | Heavy structures, columns |
| M30 | 1:0.75:1.5 | 30 | Commercial buildings, bridges |
| M35 | 1:0.5:1 | 35 | High-rise buildings |
| M40 | 1:0.4:0.8 | 40 | Pre-stressed concrete |
| M45 | 1:0.3:0.6 | 45 | Industrial floors, heavy-duty |
| M50 | 1:0.25:0.5 | 50 | Special structures, runways |
Important Notes:
- 1 bag of cement = 50 kg ≈ 0.0347 m³ (1440 kg/m³ density)
- Sand density ≈ 1700 kg/m³ (1600-1800 kg/m³ range)
- Aggregate density ≈ 1650 kg/m³ (1500-1800 kg/m³ range)
- 1 cubic meter (m³) = 35.3147 cubic feet (ft³)
- Water-cement ratio typically 0.4-0.6 (0.5 used in calculations)
- Dry volume = Wet volume × 1.54 (accounts for bulking and shrinkage)
- High-strength mixes (M30-M50) often require admixtures and special aggregates
Global Coverage
Our calculator supports cost estimation for over 200 countries with localized material prices.
Multiple Shapes
Calculate materials for rectangular slabs, beams, columns, and circular footings.
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Adjust mix ratios, wastage percentages, and material rates to match your specific needs.