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Concrete Volume Calculator

Calculate concrete needed for your construction project
Slab
Footing
Column
Wall
Enter dimensions for a rectangular slab.
Enter dimensions for a rectangular footing.
Enter dimensions for a cylindrical column.
Enter dimensions for a rectangular wall.

Select a shape and enter dimensions to calculate concrete volume.

Concrete Calculator Guide

How to Calculate Concrete Volume

1. Slabs (Driveways, Patios, Floors)

Volume = Length × Width × Thickness

Example: 20 ft × 10 ft × 0.33 ft (4 inches) = 66 cubic feet = 2.44 cubic yards

2. Footings (Foundation Support)

Volume = Length × Width × Depth

Example: 30 ft × 2 ft × 1.5 ft = 90 cubic feet = 3.33 cubic yards

3. Columns (Cylindrical Posts)

Volume = π × (Diameter/2)² × Height

Example: 1 ft diameter × 8 ft height = 6.28 cubic feet = 0.23 cubic yards

4. Walls (Retaining Walls, Barriers)

Volume = Length × Height × Thickness

Example: 50 ft × 6 ft × 0.67 ft (8 inches) = 201 cubic feet = 7.44 cubic yards

Material Estimates

  • 80 lb bags: ~45 bags per cubic yard
  • 60 lb bags: ~60 bags per cubic yard
  • Ready-mix: Ordered in cubic yards
  • Waste factor: Add 5-10% for waste and spillage
Pro Tips
  • Order Extra
    Always order 5-10% more concrete than calculated to account for spillage and uneven surfaces.
  • Thickness
    Standard slab thickness: 4 inches (0.33 ft) for walkways, 6 inches (0.5 ft) for driveways.
  • Ready-Mix vs Bags
    For projects over 1 cubic yard, ready-mix concrete is usually more economical.
Common Conversions
  • 1 cubic yard = 27 cubic feet
  • 1 cubic yard = 0.76 cubic meters
  • 4 inches = 0.33 feet
  • 6 inches = 0.5 feet
  • 12 inches = 1 foot

Construction Calculator

Accurately calculate the amount of concrete needed for your construction project. Save time and money by ordering the right amount!

Quick Reference
Cubic Yard Standard unit for ordering concrete (3ft × 3ft × 3ft)
Bag Coverage One 80lb bag covers ~0.6 cubic feet
Typical Cost $100-$200 per cubic yard (varies by location)
Related Tools
Volume Calculator Area Calculator
Learn More

Concrete & Construction:

Did You Know?

Concrete continues to gain strength for years after it's poured! While it reaches most of its strength in the first 28 days, it can continue hardening for decades.