How to use it
- Enter length, width, thickness, and price per cubic yard.
- Click the Calculate button.
- Read cubic yards, estimated cost, required bags, and cubic feet results.
What it does – The calculator turns your pad dimensions and material price into four actionable numbers: cubic yards of concrete, total cost, number of 80‑lb bags, and cubic feet. Why it matters – Knowing the exact volume prevents over‑ordering (which wastes money) and under‑ordering (which delays projects). How to read the results – Cubic yards is the volume you’ll order from the supplier. Estimated cost multiplies that volume by your price per cubic yard. Bags divides the cubic‑feet volume by 0.6 ft³ per 80‑lb bag, rounded up. Cubic feet is the raw volume before conversion. Example: A 10 ft × 12 ft pad 4 in thick yields 40 ft³ (1.48 yd³). At $120/yd³ the cost is about $178 and you need 67 bags. Use the result to place an accurate order, schedule delivery, and budget confidently.
Pro tips
- Add 5‑10% extra for waste and spillage.
- Round up the bag count to the next whole bag.
- Order concrete a day before the pour for freshest mix.
- Double‑check thickness conversion from inches to feet.
Real-life examples
- Homeowner planning a 12×16 ft patio slab.
- Contractor estimating material for a garage floor.
- Landscaper sizing a stepping‑stone base.
Case study
Mike needed a 10×20 ft patio 5 in thick. Using the calculator he saw he required 1.85 yd³, $222 at his supplier’s rate, and 62 bags. He ordered exactly that, avoided a $150 over‑order, and completed the pour on schedule.