How to use it
- Enter length (ft), width (ft) and thickness (in).
- Click the Calculate button.
- Read the cubic yards, cubic feet, and bag count results.
What it does – You plug in the slab dimensions (length, width, thickness) and the tool instantly converts them to cubic yards, cubic feet, and the number of 60 lb concrete bags required. Why it matters – Ordering the right amount saves money and prevents project delays caused by short‑ages or excess waste. How to read the results – The cubic‑yard figure is what most suppliers quote; multiply by 27 to see the total cubic feet. Divide the cubic‑feet total by 0.6 (the yield of one standard bag) to see how many bags you’ll need, then round up. Most contractors add a 5‑10 % waste factor; you can adjust the bag count accordingly before ordering. Remember to verify local building codes for minimum slab thickness.
Pro tips
- Add 5‑10% extra for waste to avoid shortages
- Always round up to the next whole bag
- Order a little extra if delivery delays are possible
- Double‑check thickness; a common mistake is entering inches as feet
Real-life examples
- A homeowner pouring a 12 ft × 10 ft patio 4 in thick
- A contractor estimating concrete for a 30 ft × 20 ft garage floor
- A landscaper preparing a 8 ft × 6 ft garden path
Case study
John entered his 15 ft × 12 ft patio dimensions, got 0.9 cubic yards, 40.5 cubic feet and a bag count of 68, rounded up to 69 bags, and ordered exactly what he needed, eliminating costly over‑order and project delay.