Concrete Calculator
Calculate concrete volume and material requirements for slabs, columns, footings, and walls. Choose a mix ratio and get cement bags, sand, and aggregate quantities with step-by-step solutions.
Calculate
Select a shape, enter dimensions, choose a mix ratio, and click Calculate to see volume and material requirements.
Volume
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Volume in Different Units
Material Requirements
Step-by-Step Solution
Volume Comparison
Materials Breakdown
Complete User Guide
What is Concrete Calculation?
Concrete calculation determines the exact volume of concrete needed and the required materials (cement, sand, aggregate) based on the selected mix ratio. Accurate calculations prevent material waste, control costs, and ensure proper project planning.
6 Calculation Modes
Rectangular Slab
V = L × W × T. Patios, driveways, floors.
Circular Slab
V = π × r² × T. Round patios, foundations.
Column
V = π × r² × H. Pillars, round columns.
Footing
V = L × W × D. Foundation footings.
Wall
V = L × H × T. Concrete walls, barriers.
Volume Conversion
Convert between cu ft, cu yd, and m³.
Understanding Mix Ratios
| Ratio | Cement | Sand | Aggregate | Use |
|---|---|---|---|---|
| 1:2:4 | 1 | 2 | 4 | General construction, foundations |
| 1:1.5:3 | 1 | 1.5 | 3 | Structural elements, higher strength |
| 1:3:6 | 1 | 3 | 6 | Non-structural, mass concrete |
| 1:2:3 | 1 | 2 | 3 | Heavy-duty, structural |
| 1:1:2 | 1 | 1 | 2 | Maximum strength |
Volume Conversions
1 cubic yard = 27 cubic feet
1 cubic foot = 0.0283168 cubic meters
1 cubic yard = 0.764555 cubic meters
Important Notes
- Add 5–10% extra to account for waste, spillage, and uneven surfaces.
- Round up cement bags to the nearest whole number when purchasing.
- Cubic yards is the standard unit used by ready-mix suppliers in the US.
- For structural projects, consult a licensed engineer for proper mix and reinforcement.