How to use it
- Enter length, width, and thickness in the fields provided.
- Input the price you pay per cubic yard of concrete.
- Click Calculate to see volume, bag count, and total cost.
What it does – The calculator takes the length, width, and thickness you enter and instantly converts them to cubic yards, the unit most contractors price by. It also tells you how many 80‑lb bags of mix you’ll need (each bag = 0.6 ft³) and the total estimated cost based on the price per cubic yard you provide.
Why it matters – Knowing the exact volume prevents over‑ordering, saves money, and avoids project delays. A 10 × 10 ft patio at 4 in thick, for example, is 33.3 ft³ (1.23 yd³), which translates to about 56 bags and roughly $148 if you pay $120 per yard.
How to read the results – Cubic yards is the volume for pricing, Estimated cost multiplies that by your rate, Bags shows mix quantity, and Cubic feet gives a quick sanity check.
Pro tips
- Add 5‑10% extra for waste and spillage
- Round up bag count to the nearest whole bag
- Order concrete a day early to avoid delivery delays
- Double‑check thickness conversion from inches to feet
Real-life examples
- Homeowner planning a 12×12 ft driveway slab
- Contractor estimating material for a backyard patio
- DIY enthusiast budgeting for a garage floor
Case study
Mike entered a 14 × 20 ft pad, 5 in thick, and a $115/yd³ price. The calculator showed 2.6 yd³, 87 bags, and a $300 estimate, letting him order the right amount and stay under budget.