Free Concrete Slab Calculator Widget
The embedded Concrete Slab Calculator turns a slab's length, width and thickness into a bagged-mix count or a ready-mix cubic-yard order, plus an optional gravel sub-base and wire-mesh estimate and a materials cost range. Readers get the full plan inline. It fits any site whose visitors pour concrete: patio and hardscape contractors, shed, deck and garage builders, ready-mix and building-material suppliers, and DIY how-to publishers.
It's a single iframe plus a one-line credit link — free, responsive, no registration, and no ads or tracking scripts on your page.
Live preview
The embed adds no ads and no tracking to your page. Prefer a guided version with a preview? Use the embed builder.
Credit line included
The code ends with a one-line credit under the calculator: “Concrete Slab Calculator by Build Material Planner”, linking to the full calculator. Please keep it. It's what keeps these calculators free to build and maintain, and it helps other people find them.
Why add it to your page
Readers usually know a slab's length and width, not how many bags that comes to. That number decides whether the job gets mixed by hand or needs a truck, so it's the question they want settled before they call anyone.
What your visitors get
A 10 x 10 ft slab, 4 in thick comes back as:
- Concrete mix (60 lb bags): 82 bags
- Ready-mix concrete: 1.5 cu yd
- Compactable gravel sub-base: 1.67 tons
- 6x6 welded wire mesh: 110 sq ft
- Bagged concrete estimate (DIY): $507 – $732
Where the Concrete Slab Calculator widget fits
- A "how to pour a concrete slab" or "patio ideas" article
- A concrete or ready-mix supplier's product, mix or delivery page
- A shed, deck or garage build guide where a pad is step one
How to add it to your site
Copy the code above and paste it where the calculator should appear. See the install notes for WordPress, Squarespace, Wix and Webflow, plus sizing and common questions.
Questions from site owners
Does it decide bags vs. ready-mix for me?
It shows both, and flags when a pour is large enough that ready-mix delivery is usually the better call (roughly one cubic yard and up), so the reader can see the trade-off rather than guess.
Can readers turn the gravel base or wire mesh off?
Yes — both are optional checkboxes in the embedded form, and the material list and cost estimate update accordingly.
Which bag size does it assume?
60 lb bags, at about 0.45 cubic feet of mixed concrete each, with a 10% allowance for over-excavation and spillage that readers can change.
Just need to run the numbers yourself? Use the full Concrete Slab Calculator — it has the formulas, a worked example and an FAQ. Also for your readers: Rebar Calculator widget, Gravel Driveway Calculator widget, Flooring Calculator widget. Or see all embeddable calculators.