Embed our fee calculators — free

Every calculator on this site is available as a lightweight embed you can drop into any blog post, help page or seller community site with a single iframe snippet. No signup, no API key, no attribution requirement beyond the small "Powered by" link that keeps the tool free.

How to embed

Copy this snippet, replace the URL with the calculator you want, and paste it into your page:

<iframe src="https://netmarginlab.com/embed/paypal-fee-calculator"
        width="100%" height="720" style="border:0;border-radius:12px"
        loading="lazy" title="PayPal fee calculator"></iframe>

Want the iframe to resize itself to fit the content? Add this tiny loader once per page and the embed will report its height automatically:

<script>
window.addEventListener('message', function (e) {
  if (e.data && e.data.type === 'nml-embed-height') {
    var f = document.querySelector('iframe[src*="netmarginlab.com/embed/"]');
    if (f) f.style.height = (e.data.height + 16) + 'px';
  }
});
</script>

Available calculators

Each embed is the full working calculator — rates checked against the platform's published fee schedule, with the verification date shown on the page.

Terms, briefly

Embeds are free for editorial and community use. Keep the "Powered by Net Margin Lab" link intact — that's the whole ask. Don't resell the embed or present it as your own tool. Rates are estimates for planning, not customs or tax advice.