Volume, bags, and cost estimator
Cement Slab Calculator
Answer first: Calculate cement slab volume, bags, and cost from dimensions. Compare bags with ready-mix, check waste, and review the total before ordering.
10 ft x 10 ft x 4 in
about 1.23 yd3 and ~56 bags
At 0.6 ft3 per 80 lb bag with 10% waste.
1 cubic yard
about 45 bags at 0.6 ft3
Compare with local ready-mix minimums.
Cement Slab Calculator
Enter dimensions. Compare bags with ready-mix delivery.
Volume
1.36 yd3
Bags
62
Ready-mix
$367
Bagged
$310
Interactive workflow
Run the numbers, then save or export the project
Save this estimate or download a PDF report
The PDF report uses the current calculated result. Save the estimate first when you want to reuse the inputs later.
What ordinary cement slab calculators miss
The useful result is the delivery minimums, waste, fees, and cost comparison.
| Benchmark says | Replace with local input | Next check |
|---|---|---|
| One number, no cost | Compare bag count, bag cost, and ready-mix cost side by side. | Order the cheaper path after confirming local minimums. |
| Ignores waste | Add a waste factor for real pour conditions. | Use 5% for clean forms, 10% for typical pours. |
| No delivery check | See minimum billable yards before assuming ready-mix is available. | Call the supplier to confirm minimums and access. |
Cement Slab Calculator checklist
Use these checks before relying on the estimate.
| Signal to check | What it means | Next step |
|---|---|---|
| Bag yield | The bag yield matches your mix and bag size. | Check the bag label for cubic feet per bag. |
| Waste factor | The waste percentage matches site conditions. | Increase waste for uneven ground or complex shapes. |
| Ready-mix minimum | The supplier minimum load is confirmed. | Ask about minimums, lead time, and access. |
| Delivery and access | The truck can reach the pour location. | Confirm chute reach and any pump needs. |
Related concrete planning tools
Move from a single calculation into a purchase, proposal, or pour-day decision with connected calculators and checklists.
How do I use this calculator?
Enter your slab length, width, and thickness. The calculator converts to cubic yards, adds waste, and shows bag count and cost.
How many bags are in a cubic yard?
At 0.6 ft3 per 80 lb bag, one cubic yard (27 ft3) takes about 45 bags. Adjust the bag yield for other sizes.
Should I use bags or ready-mix?
For small pours under 1-2 yards, bags can be cheaper. For larger pours, ready-mix is usually cheaper per yard. Compare both with your local prices.
Does this include delivery fees?
Yes. Enter delivery fee, access fee, and minimum billable yards to see full ready-mix cost alongside bagged cost.
Planning disclaimer
This calculator provides planning estimates. Confirm actual prices, minimums, and site conditions with your supplier before ordering.