Free widget

Put a +EV calculator on your site

Run a betting blog, tipster page, or affiliate site? Give your readers a real, working expected-value calculator — with one line of code. It's free, needs no signup or API key, and always stays up to date.

Live preview — this is exactly what your readers get

Option 1 — Script embed (recommended)

Paste this where you want the calculator to appear. The <div> marks the spot; the script renders it. Include the script once per page even if you add several calculators.

<div class="ironmarker-ev-calc"></div>
<script src="https://ironmarker.com/embed/ev-calculator.js" async></script>

Option 2 — iframe embed (no JavaScript)

Some platforms (e.g. hosted WordPress.com, certain page builders) strip <script> tags. Use this self-contained iframe instead:

<iframe src="https://ironmarker.com/tools/embed/ev-calculator/"
        width="100%" height="360" style="border:0;max-width:440px"
        title="Iron Marker EV Calculator" loading="lazy"></iframe>

Want it to auto-fit its content instead of a fixed 360px? Add this snippet once, anywhere on the page — the calculator reports its height and this resizes the frame to match:

<script>
window.addEventListener('message', function (e) {
  if (e.origin !== 'https://ironmarker.com') return;
  var h = e.data && e.data.ironmarkerEmbedHeight;
  if (!h) return;
  document.querySelectorAll('iframe[src*="ironmarker.com/tools/embed/"]')
    .forEach(function (f) { f.style.height = h + 'px'; });
});
</script>

Why add it?

Genuinely useful to your audience. Betting readers actually use an EV calculator — it's a sticky, practical tool, not a banner.
Zero maintenance. We host and update it. The math stays correct; you do nothing.
Lightweight & safe. A few kilobytes, async, no dependencies, scoped styles that won't touch your CSS.
Free forever. The only ask is the small "Powered by Iron Marker" credit link, which stays in place.

Frequently asked questions

Is the embeddable calculator free to use?

Yes. The widget is completely free to embed on any site, with no signup and no API key. It renders a working +EV expected-value calculator for your readers and includes a small credit link back to Iron Marker.

How do I add the calculator to my website?

Paste one <div> where you want the calculator to appear and include our script tag once on the page. The widget renders itself automatically. A no-script iframe version is also provided for platforms that strip JavaScript.

Will the widget slow down my page?

No. The script is a few kilobytes, loads asynchronously, has no dependencies, and injects scoped styles so it won't interfere with your existing CSS.

Want the full scanner, not just the calculator?

Iron Marker finds live +EV bets across every major US sportsbook in real time — devigged against the sharp line, with Kelly staking. $39/mo, 7-day free trial. Affiliates earn 25% recurring.

Start free trial

The embeddable calculator is educational and for informational purposes only — not betting or financial advice. Must be 21+. Problem gambling? Call 1-800-GAMBLER.