Free Baluster Calculator Widget
The embedded Baluster Calculator converts a railing length into a baluster count and evenly distributed spacing, held to the common 4 in sphere rule. It fits deck builders, railing suppliers, and home-improvement how-to sites.
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: “Baluster 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
Baluster spacing is a division problem that stops people mid-project: every gap has to come out equal, and none can pass the limit. Readers of a railing guide often stall at that step, so the calculator does the sum and shows the actual gap they'll get.
What your visitors get
An 8 ft railing of 2x2 wood balusters comes back as:
- Wood 2x2 (actual 1.5 in): 16 balusters
- Baluster materials estimate: $48 – $96
Where the Baluster Calculator widget fits
- A railing or baluster supplier's product page
- A "deck railing code requirements" or build-guide article
- A deck-building contractor's project page
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 check code compliance?
It applies the standard 4 in max gap rule (adjustable) and warns if a custom gap exceeds it — always confirm against your specific local code.
Does it cover wood and metal balusters?
Yes — common wood and metal baluster widths are built in, each with its own material cost range.
Can readers change the post spacing?
Yes. It starts with a post every 6 ft, and readers can set anything from 2 to 12 ft, which changes the number of sections and the gap.
Just need to run the numbers yourself? Use the full Baluster Calculator — it has the formulas, a worked example and an FAQ. Also for your readers: Fence Calculator widget, Concrete Slab Calculator widget, Drywall Calculator widget. Or see all embeddable calculators.