Concrete Calculator
Estimate volume, weight and pre-mix bags needed for slabs, footings, columns, stairs, curbs and tubes — instantly.
Slabs, Footings & Walls
Hole, Column or Round Footing
Circular Slab or Tube
Curb & Gutter Barrier
Stairs
About This Concrete Calculator
Our free concrete calculator is an essential tool for contractors, DIY builders, and civil engineers who need fast and accurate concrete volume estimation. Whether you're pouring a concrete slab, a round footing, a column, or building concrete stairs, this tool computes cubic meters, cubic yards, and the number of pre-mix bags required with precision. Simply input your dimensions, select your preferred unit of measurement (meters, feet, inches, centimeters), and hit Calculate for an instant result. The calculator also accounts for multiple quantities, helping with large-scale projects like driveways, retaining walls, and curb and gutter installations. We recommend adding 5–10% to your estimate to cover waste and over-excavation, a widely accepted practice in construction cost estimation. Results include total volume in m³ and yd³, weight in kg and tonnes, and the equivalent number of standard 40 kg and 25 kg ready-mix bags. No sign-up or download needed — all calculations happen right in your browser with zero data sent to any server.