How to use it
- Enter Length, Width and Thickness values.
- Click the Calculate button.
- Read the cubic feet, cubic yards and bag estimate results.
What it does – The Concrete Removal Calculator turns the dimensions of the slab you plan to pull out into three useful numbers: total cubic feet, total cubic yards, and an estimate of 80‑lb bags of mix needed to fill the void if you are re‑pouring.
Why it matters – Knowing the exact volume prevents over‑ordering, saves money, and ensures you have enough material on site. Contractors and DIYers alike can quote jobs accurately.
How to read the results – Cubic feet is the raw volume from your measurements. Divide by 27 to see cubic yards, the standard delivery unit. Divide cubic feet by 0.6 to see how many 80‑lb bags you’ll need. Round up to account for waste. Use the bag count to place an accurate order and include a 5‑10% buffer for spillage or compaction.
Pro tips
- Add 5‑10% extra volume for waste.
- Round the bag count up to the nearest whole bag.
- Order bags in multiples of 10 for better pricing.
- Double‑check thickness conversion (inches to feet) before entering.
Real-life examples
- A homeowner removing a 4×8 ft patio slab 4 in thick wants to know how many bags to refill.
- A contractor estimating concrete needed to fill a trench after demolition.
- A landscape designer calculating material for a small garden bed removal and backfill.
Case study
Mike needed to pull out an old 6 × 10 ft driveway that was 5 in thick. Using the calculator he saw the volume was 30 cubic yards and that he’d need 1,350 bags of mix to backfill. He ordered 1,400 bags, saved a day of guesswork, and stayed within budget.