Concrete Calculator
Calculate concrete volume (m³, yd³, cft), ready-mix truckloads, pre-mix bags, and raw mix materials (cement, sand, aggregate).
Slab Dimensions
Bill of Materials (Dry Mix Constituents)
Calculated using IS/ACI standard 1.54× dry volume factor:Concrete Mix Design Guide
- • M20 (1:1.5:3): 20 MPa strength at 28 days. Best for standard residential roof slabs, beams, and lintels.
- • M25 (1:1:2): 25 MPa high strength. Recommended for columns, water tanks, and heavily loaded footings.
- • M15 (1:2:4): 15 MPa. Suitable for floor PCC beds, pathway pavements, and non-structural leveling.
How to Use Concrete Calculator
- Select the concrete structure type (Slab / Patio, Footing, Square Column, Round Column, Stairs, or Retaining Wall).
- Enter dimensions in feet and inches (or metric meters/cm).
- Select your concrete mix grade (M20 1:1.5:3, M25 1:1:2, M15 1:2:4, or M10 1:3:6).
- Review the wet volume in cubic meters (m³), cubic yards (yd³), and cubic feet (cft).
- Check the material breakdown for ready-mix truckloads, pre-mix bagged concrete, or raw site-mix materials (cement bags, sand, aggregate, water).
Key Features & Privacy Guarantee
- 6 Structural Shapes Supported: Slabs/Floors, Footings, Square/Rectangular Columns, Round Cylindrical Columns, Steps/Stairs, and Retaining Walls.
- Civil Engineering Standard 1.54× Dry Volume Multiplier: Accurately converts wet concrete volume to raw dry constituents factoring void ratios.
- Mix Design Standards: M20 (1:1.5:3 standard RCC), M25 (1:1:2 heavy structural), M15 (1:2:4 PCC), and M10 (1:3:6 leveling course).
- Triple Volume Outputs: Real-time calculation in Cubic Meters (m³), Cubic Yards (yd³), and Cubic Feet (cft).
- Complete Bill of Materials: 50 kg cement bags, sand in cft/tons, gravel aggregate in cft/tons, and water in liters.
Frequently Asked Questions
Why is wet concrete volume multiplied by 1.54 for dry materials?
Dry sand, cement, and coarse aggregate contain large air voids. When water is added, the finer cement particles fill the voids between sand grains and aggregate. Thus, 1 m³ of wet compacted concrete requires approximately 1.54 m³ of dry raw ingredients.
How many bags of cement are needed for 1 cubic meter of M20 concrete?
For standard M20 concrete (1:1.5:3 mix ratio with 1.54 dry factor), approximately 8.0 to 8.2 bags of cement (50 kg each) are required per cubic meter (m³).
How many 50kg pre-mix bags equal 1 cubic meter of concrete?
One 50 kg pre-mix concrete bag produces approximately 0.022 m³ (0.78 cft) of mixed concrete. You need approximately 45 to 46 bags (50 kg each) to make 1 cubic meter (or ~45 bags of 80 lb per cubic yard).
How much concrete does a Ready-Mix transit truck carry?
A standard transit mixer truck carries between 6.0 to 7.0 cubic meters (approx 8 to 9 cubic yards) of ready-mix concrete.