Calculate concrete volume in cubic feet and cubic yards, plus weight and 60 lb / 80 lb bag counts, for slabs, footings, columns, and circular pours.
Concrete Mix Formula:
Pro Tips:
This calculator provides estimates. Actual requirements may vary based on project specifics, local conditions, and waste factors. Always consult with a professional for large projects.
Select slab, footing, column, circular tube, or stairs. Each shape uses the right volume formula: length x width x height for slabs, pi x r^2 x height for cylinders, etc.
Type dimensions in feet, inches, yards, meters, or centimeters. The calculator converts and rounds to the precision you need for ordering.
See the volume in cubic yards and cubic feet, the total weight, and the number of 60 lb or 80 lb bags to buy. We add a 5-10% waste factor so you order enough.
For related calculations, try our square footage calculator.
FAQ
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One cubic yard of concrete equals about 45 80-lb bags, 60 60-lb bags, or 90 40-lb bags. Our concrete calculator shows all three bag sizes in the result. For most DIY projects under 1 cubic yard, bags are cheaper than ready-mix delivery. The concrete calculator adds 10% to your result for waste and uneven subgrade.
How it works
Our concrete calculator lets you calculate cubic yards, cubic feet, weight, and bag counts for slabs, footings, columns, and circular pours, in three steps.
Select Slab/Square for rectangular pours (patios, driveways, footings) or Circular for round forms (tube footings, sonotubes, round pads). Enter the length, width, and thickness in feet and inches, or diameter and depth for circles. Set quantity if you are pouring multiple identical slabs.
Press the Calculate Concrete button. The result shows volume in cubic feet and cubic yards, total weight in pounds, and the number of 60 lb and 80 lb bags needed. Add 10% to the result for waste and uneven subgrade.
Use cubic yards to order ready-mix (typical truck holds 8-10 yards), or buy 60 lb / 80 lb bags for small jobs. Concrete weight is ~150 lb per cubic foot. Order on a cool morning and pour within 90 minutes of mixing for the best finish.