Free Concrete Calculator for Construction Projects
Use our advanced concrete calculator to accurately estimate the amount of concrete required for slabs, walls, footings, columns, tubes, and stairs. Simply enter your dimensions, select your preferred units, and get instant results in cubic yards, cubic feet, cubic meters, and concrete bags.
Slabs, Walls, or Square Footings
Holes, Columns, or Round Footings
Hollow Tube or Circular Slab Ring
Standard Curb and Gutter Barrier Profile
Staircase Step Run, Rise, and Top Platform Shape
Estimated Materials Needed
Instant Live Results
Volume (Cubic Yards)
0.00 yd³
Volume (Cubic Meters)
0.00 m³
60-Pound Pre-mix Bags
0 Bags
80-Pound Pre-mix Bags
0 Bags
⚠️ Professional Spillage Recommendation: We have calculated the values above with exact mathematical volume. It is highly recommended that you purchase an extra 10% of concrete (calculated as 0.00 yd³) to cover slab deviation, aggregate settlement, ground leveling, and spills during pouring.
How To Use This Concrete Calculator
Enter the dimensions of your slab, wall, footing, column or staircase. The calculator instantly estimates concrete volume and bag requirements.
Concrete Formulas
Slab Formula
Volume = Length × Width × Thickness
Cylinder Formula
Volume = π × Radius² × Height
Tube Formula
Volume = π × (R₁² − R₂²) × Height
Frequently Asked Questions
How much concrete do I need?
Enter dimensions and the calculator will estimate the required volume.
How many 80 lb bags are in 1 cubic yard?
Approximately 45 bags.