How to use it
- Enter length, width, and thickness in feet and inches.
- Input the price per cubic yard you’ve been quoted.
- Click Calculate.
- Read cubic yards, estimated cost, bag count and cubic feet.
What it does – The calculator turns the dimensions of the slab you plan to break up into concrete volume, then multiplies by the price you pay per cubic yard. It also tells you how many 80‑lb bags of mix equal that volume (each bag = 0.6 ft³) and shows the result in cubic feet for easy comparison with other projects.
Why it matters – Knowing the exact cubic yards prevents over‑ordering, saves money, and helps you budget disposal fees. The bag count lets you order the right amount of mix if you plan to refill the void.
How to read the results – Cubic yards is the demolition volume. Estimated cost is yards × price per yard. Bags is cubic feet ÷ 0.6. Cubic feet is a secondary volume view.
Pro tips
- Add 10% waste to the volume to cover breakage and uneven surfaces.
- Round bag count up to the next whole bag; you can’t purchase a fraction of a bag.
- Compare the estimated cost with local disposal fees before ordering.
- Double‑check thickness conversion from inches to feet to avoid calculation errors.
Real-life examples
- A homeowner estimating the cost to remove a cracked driveway before installing new pavers.
- A contractor bidding on a commercial slab demolition and needing precise material removal numbers.
- A landscaper planning to replace a concrete patio and wanting to know how much fill material to order.
Case study
Mike entered a 12 ft × 20 ft patio, 4 in thick, with a local price of $150 per cubic yard. The tool showed 2.22 yd³, $333 cost, 44 bags, and 60 ft³, letting him order exactly the right amount of mix and avoid a $200 over‑order.