How to use it
- Enter the length in feet.
- Enter the width in feet.
- Enter the thickness in inches.
- Read the cubic yards, bags, and cubic feet results instantly.
What it does The Imi Concrete Calculator turns the dimensions you enter—length (ft), width (ft) and thickness (in)—into three useful numbers: total cubic yards, total cubic feet, and how many 80‑lb bags of mix you’ll need. Why it matters Knowing cubic yards helps you order the right amount of ready‑mix, while cubic feet and bag count guide DIY projects and budgeting. How to read it Cubic yards are shown to two decimals for ordering bulk concrete. Cubic feet is the raw volume of your slab. Divide the cubic‑feet figure by 0.6 to see the approximate number of 80‑lb bags (rounded up). For a 10 × 10 ft slab 4 in thick the tool shows ~1.23 yd³, 33.33 ft³, and 56 bags.
Pro tips
- Add 5‑10% extra for spillage and uneven subgrade.
- Round bag count up to the next whole bag; you can’t buy a fraction.
- Order concrete a day before the pour to avoid delays.
- Double‑check thickness units; the calculator expects inches, not centimeters.
Real-life examples
- A homeowner estimating material for a new driveway slab.
- A contractor preparing a quote for a patio pour.
- A landscaper sizing a concrete retaining wall base.
Case study
John needed a 12 × 8 ft patio 5 in thick. Using the calculator he saw he required 1.64 yd³, 44.3 ft³ and 74 bags, so he ordered the correct amount and avoided a costly over‑order.