FREE DIY ESTIMATOR
Concrete Calculator
Estimate concrete volume and the number of standard bags needed for a rectangular slab or pad.
How the estimate works
Enter the slab length and width in feet and thickness in inches. The calculator converts the dimensions into cubic feet and cubic yards, then divides by the yield per bag.
Before pouring
- Confirm finished dimensions and required thickness.
- Plan for a compacted base and forms where needed.
- Check the actual yield printed on your concrete bag.
- Include a reasonable allowance for waste and uneven excavation.
Important planning note
Structural concrete, footings, frost-depth requirements, reinforcement, and permit rules can vary by location and project. Verify local requirements before starting.
Plan the whole job
Send your estimate to the Project Planner to add forms, gravel, reinforcement, finishing tools, and curing supplies.