Concrete Calculator ā Estimate Volume, Weight & Bags Needed
Use this free concrete calculator to estimate concrete volume, weight, and bag requirements for slabs, square footings, walls, holes, columns, tubes, curbs, gutters, and stairs.
Concrete Calculator
Enter dimensions for a shape below to calculate concrete volume and estimated bag requirements.
Concrete Calculator
The Concrete Calculator estimates the volume and weight of concrete necessary to cover a given area. Purchasing slightly more concrete than the estimated result can reduce the probability of having insufficient concrete.
Slabs, Square Footings, or Walls
Hole, Column, or Round Footings
Circular Slab or Tube
Curb and Gutter Barrier
Stairs
Concrete is a material comprised of coarse aggregates such as gravel, crushed stone, and slag, combined with a cement binder. Cement reacts over time and forms a strong mass when cured correctly.
This calculator is for planning estimates. Real usage can vary based on compaction, formwork leakage, waste, and site conditions, so ordering a safety margin is usually recommended.
How to Use
- Select the concrete shape that matches your project.
- Enter the dimensions and quantity.
- Choose the correct units for each measurement.
- Click Calculate to view volume, weight, and estimated bag count.
How This Calculator Works
This concrete calculator converts all measurements into meters, calculates the total concrete volume, and then estimates concrete weight and the number of 60-lb and 80-lb bags needed.
Frequently Asked Questions
What shapes does this concrete calculator support?
It supports slabs, footings, walls, holes, columns, round footings, tubes, curbs, gutters, and stairs.
Does it calculate bag requirements?
Yes. It estimates how many 60-lb and 80-lb bags you may need based on the calculated weight.
Should I order extra concrete?
Yes. It is usually smart to order a little extra to cover waste, spillage, and site variation.