For Ontario family-law and separation resource sites

Embed the calculator. One line of HTML.

The same free Ontario child- and spousal-support calculator we run at cairnguide.ca, drop-in as an iframe on your site. Auto-resizes, mobile-friendly, no signup, no tracking pixels.

Free, forever

No licence, no fee. The only ask is that you leave the small "Powered by Cairn" link in the footer of the widget.

Always current

Federal Child Support Guidelines and the Spousal Support Advisory Guidelines, with Ontario tax. We update the engine; your site gets the new math automatically.

Auto-resizing

The iframe posts its height to your page after every layout change. No scrollbar inside the widget. Mobile-friendly out of the box.

Copy-paste snippet

<iframe
  src="https://cairnguide.ca/calculator/embed"
  title="Ontario support calculator by Cairn"
  width="100%"
  height="1200"
  loading="lazy"
  style="border:0;max-width:780px;display:block;margin:0 auto"
  referrerpolicy="strict-origin-when-cross-origin"
></iframe>
<script>
  // Optional: auto-resize the iframe to its content.
  window.addEventListener("message", function (e) {
    if (e.origin !== "https://cairnguide.ca") return;
    if (!e.data || e.data.type !== "cairn-calc-embed-height") return;
    var f = document.querySelector('iframe[src^="https://cairnguide.ca/calculator/embed"]');
    if (f) f.style.height = (e.data.height + 20) + "px";
  });
</script>

Paste anywhere a normal HTML embed works — WordPress (Custom HTML block), Squarespace (Code block), Webflow (Embed element), or a static site.

Attribution is automatic — we'll know it's your site from the iframe referrer, no configuration needed.

Live preview