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True Trade Path

For schools, union locals and contractors

Embed our tools on your site

Every calculator on this site can run inside a page on yours. One line of HTML, no ads, no tracking, no account, no cost.

Tools available
40
Cost
Free
Ads in embeds
None

Why we give these away

A wire-size calculator is more useful sitting next to an apprenticeship application than it is on our site. If you run a training program, a union local, a community college trade department or a contracting business, the tool belongs where your readers already are.

We get something from it too, and it is worth being plain about what: people who use a tool on your site sometimes come looking for the rest of them. That is the entire arrangement. There is no data exchange, no lead sharing, and nothing we collect from your visitors.

Pick a tool and copy the snippet

Ohm's Law Calculator

Live preview

Making the frame resize itself

Calculators change height as people use them, so a fixed-height iframe either clips the answer or leaves white space beneath it. The embed posts its height to your page whenever it changes. Add this once, anywhere on the page, and every embed on it will size itself:

<script>
  window.addEventListener("message", function (e) {
    if (!e.data || e.data.type !== "ttp:embed:height") return;
    document.querySelectorAll('iframe[src*="truetradepath.com/embed/"]').forEach(function (f) {
      if (f.contentWindow === e.source) f.style.height = e.data.height + "px";
    });
  });
</script>

It checks the message type and matches the frame by its own content window, so another script on the page cannot resize our embed by posting a lookalike message.

Content Security Policy

If your site sends a CSP, the embed needs frame-src truetradepath.com — or child-src on older policies. Nothing else: the embed loads no fonts, scripts or images from anywhere else.

Common questions

What does it cost?
Nothing, and there is no tier where it starts costing something. You are not agreeing to a licence, you are not creating an account, and we are not going to email you about upgrading.
Do the embeds show ads?
No. The embedded version loads no advertising and no analytics of any kind — not ours and not Google's. We do not think it is right to pull a tracker into your site's pages, and AdSense expects ads to run on our inventory rather than yours.
Do you track our visitors?
No. The embed sets no cookies, loads no third-party script and sends us no data about who used it. The only message it emits is its own pixel height, posted to your page so the frame can resize itself.
Is attribution required?
The embed carries a small branded link back to the tool, and we ask that you leave it in place, but nothing breaks if your design cannot accommodate it. We deliberately do not use keyword-stuffed anchor text: Google treats widget links with rich anchors as a link scheme, and we are not interested in putting your site or ours at risk for a ranking signal.
Will the calculation change without warning?
The maths can change when a code cycle or a published table changes, because a calculator that quietly stays wrong is worse than one that changes. What will not change without a redirect is the embed URL.
Can we self-host it instead?
If an iframe is not workable for you, email hello@truetradepath.com and tell us what you need. We would rather solve it than have you rebuild the calculator.

Something you need that is not here? Email hello@truetradepath.com. If you are also running a training program or an apprenticeship, listing it here is free as well.

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