How to use it
- Enter slab length, width, and thickness in inches.
- Enter footing length, width, depth, and number of footings.
- Click the Calculate button.
- Read the total volume in cubic feet and cubic yards.
What it does – The Concrete Slab With Footing Calculator takes the length, width, and thickness of your slab plus the size and count of each footing and instantly returns the total concrete volume in cubic feet and cubic yards. Why it matters – Ordering the right amount of concrete prevents costly over‑orders and avoids shortfalls that delay a build. Concrete is sold by the cubic yard, so seeing both units lets you compare the on‑site estimate with the supplier’s pricing. How to read the results – The cubic‑feet number reflects the raw geometric volume; divide by 27 (or use the provided cubic‑yard figure) to know how many full yards to order. Remember to add a waste factor before placing your order. You can reuse the tool for any shape as long as the slab stays rectangular and the footings are uniform. Simply change the numbers for each new project and the calculator updates instantly. The result helps you prepare accurate material lists, compare quotes, and communicate clear requirements to your concrete supplier.
Pro tips
- Add 5‑10% extra for waste.
- Round up to the nearest 0.1 yd for ordering.
- Order concrete after confirming access for delivery trucks.
- Double‑check footing dimensions; a common mistake is mixing feet and inches.
Real-life examples
- Homeowner planning a 12×16 ft patio with footings.
- Contractor estimating concrete for a new garage slab.
- DIY renovator sizing a shed foundation with multiple footings.
Case study
Mike needed a 10 ft by 20 ft patio with 4 footings. Using the calculator he entered the dimensions, got 1.9 cubic yards (≈52 ft³) and ordered 2 cubic yards, avoiding a costly over‑order and keeping his project on budget.