Free Baluster Calculator Widget
The embedded Baluster Calculator converts a railing length into a baluster count and evenly distributed spacing that meets the standard 4 in sphere rule. It fits deck builders, railing suppliers, and home-improvement how-to sites.
It's a single iframe — free, responsive, no registration, and it adds no link, ad or tracking script to your page.
Live preview
The embed adds no link, no ads and no tracking to your page. Prefer a guided version with a preview? Use the embed builder.
One small ask
Nothing links back to us from the widget itself. If your readers find it useful, please add a credit link to the Baluster Calculator somewhere on your page — that's what keeps it free to maintain and helps others discover it.
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
- Plain HTML: paste the snippet where you want the calculator to appear.
- WordPress: add a “Custom HTML” block and paste the snippet in. Avoid the “Paragraph” block — it strips iframes.
- Squarespace / Wix / Webflow: add an “Embed” or “Custom Code” / “HTML” element and paste the snippet.
- The second line (
embed.js) is optional — it just auto-sizes the frame height. You only need it once per page even with several calculators.
Sizing & responsiveness
Set the width to 100% to fill the column it sits in, or a fixed pixel value for a sidebar or narrow layout. Height is handled for you: with embed.js the frame grows and shrinks to fit the calculator (including after someone runs an estimate); without it, the frame stays at 850px and everything still works, just with an inner scrollbar on small screens.
Questions from site owners
Is it really free? Any catch?
Yes, free. No account, no API key, no usage limits, and no link, ads or tracking added to your page. The only thing asked is that, if the tool is useful to your readers, you add a plain credit link back to the calculator somewhere on the page.
Will it slow my page down or track my visitors?
No. The calculator loads in an iframe so it never blocks your page, it ships no third-party ad or analytics scripts onto your site, and it sets no cookies on your visitors. The optional resizer script is a few KB and loads asynchronously.
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 I resize it or set a fixed width?
Yes. Choose responsive (100%) or a fixed-pixel width when you copy the code; height auto-fits the calculator, with a fixed fallback if the resizer script is blocked.
Just need to run the numbers yourself? Use the full Baluster Calculator — it has the formulas, a worked example and an FAQ. Or see all embeddable calculators.