Concrete Calculator
Calculate concrete volume, materials, and cost for your project
Project Details
Shape Illustration
Visual representation of selected shape
Rectangular Slab
Volume = Length × Width × Thickness
Concrete Volume Required
1.23
Cubic Yards
With 10% waste: 1.36 yd³
Material Estimates
Concrete bags needed (approximate)
80 lb Bags
0.6 ft³ per bag
56
60 lb Bags
0.45 ft³ per bag
75
40 lb Bags
0.3 ft³ per bag
112
Cost Estimate
Total Estimated Cost
$203.70
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About Concrete Calculations
How to Calculate Concrete Volume
Concrete volume is calculated based on the shape and dimensions of your project. The calculator supports slabs, footings, columns, walls, circular pads, and stairs. Always add 5-10% extra for waste, spillage, and over-excavation.
Formulas by Shape
Slab/Footing:
Volume = Length × Width × Thickness
Column:
Volume = Width × Width × Height
Wall:
Volume = Length × Thickness × Height
Circular Slab:
Volume = π × (Diameter/2)² × Thickness
Stairs:
Volume = (Width × Tread × Riser × Steps × (Steps+1)) / 2
Concrete Mix Ratios
Standard Mix (3000 PSI):
• 1 part cement
• 2 parts sand
• 3 parts gravel
• 0.5 parts water
High Strength (4000 PSI):
• 1 part cement
• 1.5 parts sand
• 2.5 parts gravel
• 0.4 parts water
Tips for Concrete Projects
- Order 5-10% extra concrete to account for waste and spillage
- Ensure proper sub-base preparation and compaction
- Use rebar or wire mesh for reinforcement in slabs
- Pour concrete in sections for large projects
- Cure concrete properly for at least 7 days
- Avoid pouring in freezing temperatures or extreme heat
- Use a vibrator to remove air pockets in thick pours
Unit Conversions
• 1 cubic yard = 27 cubic feet
• 1 cubic meter = 35.31 cubic feet
• 1 cubic yard ≈ 0.765 cubic meters
• 1 foot = 0.3048 meters
• 1 inch = 2.54 centimeters