Free Concrete Calculator 2026 to estimate concrete volume for slabs, footings, columns and foundations in cubic meters, cubic feet, and yards instantly.
Calculate the exact amount of concrete needed for your construction project. Whether you're pouring a slab, footing, or column, our calculator provides accurate volume estimates in cubic feet, cubic meters, and cubic yards. Get instant calculations for cement bags needed and cost estimates.
Calculate concrete volume based on the shape of your project.
Slab/Rectangular: Volume = Length × Width × Thickness
Column/Cylinder: Volume = π × Radius² × Height
Cubic Yards = Cubic Feet ÷ 27
Cubic Meters = Cubic Feet × 0.0283168
Number of Bags = Cubic Meters ÷ 0.035
Order 5-10% extra to account for spillage, uneven ground, and measurement variations. For complex projects or if you're inexperienced, consider 10-15% extra. Our calculator provides this recommendation automatically.
An 80-pound bag yields about 0.6 cubic feet or 0.017 cubic meters. We calculate based on standard 0.035 m³ bags. For 1 cubic yard (27 cubic feet), you need approximately 45 bags of 80-pound concrete mix. For projects over 1 cubic yard, ready-mix concrete is more economical.
Residential slabs are typically 4 inches thick. Driveways and areas with heavy loads may require 6 inches or more. Footings are usually 8-12 inches thick depending on the load and soil conditions.
For projects over 1 cubic yard, ready-mix is more economical and convenient. Bagged concrete works well for small projects under 1 cubic yard. Ready-mix also ensures better consistency and strength.
Use the Column/Cylinder tab in our calculator. Enter the diameter and height, and we'll automatically use the formula: Volume = π × radius² × height. The calculator handles all the math for you.
Yes! Footings are essentially rectangular slabs. Use the Slab/Footing tab and enter your footing's length, width, and depth (thickness) to calculate the concrete volume needed.
Your calculation history is stored in your browser's local storage for up to 3 days. The calculator automatically removes entries older than 3 days to keep your history relevant. You can also manually clear your history at any time.