Put this
calculator on
your own site.
If you run a wiring guide, a marine or automotive resource page, a trade course, or a forum FAQ, your readers keep asking the same question: what size heat shrink do I need? Paste one line of HTML and they can answer it without leaving your page.
- No cookies, no analytics, no fonts, no external requests — nothing leaves your page.
- Self-contained single file. Loads in well under a second, lazily by default.
- Works on any platform that accepts HTML: WordPress, Squarespace, forum posts, plain static sites.
- Free forever. The only condition is that the credit link stays visible.
This is the
actual widget.
Not a screenshot — the real embed, running in an iframe exactly as it will on your page. Try it.
Copy. Paste.
Done.
Drop this wherever you want the calculator to appear. Keep the credit line underneath — that sentence is the whole price of the widget.
<!-- Heat Shrink Tubing Size Calculator — free widget by Helixal -->
<iframe
src="https://www.helixalindustrial.com/embed/heat-shrink-calculator.html?ratio=3"
title="Heat Shrink Tubing Size Calculator"
width="100%"
height="1040"
loading="lazy"
style="border:0;max-width:640px;display:block"
></iframe>
<p style="font:12px/1.5 system-ui,sans-serif;max-width:640px;opacity:.75;margin:8px 0 0">
Calculator by <a href="https://www.helixalindustrial.com/heat-shrink-calculator">Helixal — heat shrink tubing size calculator</a>
</p>Short on space? Compact mode drops the all-compatible-sizes table and keeps the recommendation — about 570px tall instead of 1020px.
<!-- Heat Shrink Tubing Size Calculator (compact) — free widget by Helixal -->
<iframe
src="https://www.helixalindustrial.com/embed/heat-shrink-calculator.html?ratio=3&compact=1"
title="Heat Shrink Tubing Size Calculator"
width="100%"
height="600"
loading="lazy"
style="border:0;max-width:640px;display:block"
></iframe>
<p style="font:12px/1.5 system-ui,sans-serif;max-width:640px;opacity:.75;margin:8px 0 0">
Calculator by <a href="https://www.helixalindustrial.com/heat-shrink-calculator">Helixal — heat shrink tubing size calculator</a>
</p>Best fit — auto-height. The widget reports its height to your page so the iframe resizes itself, with no fixed guess and no inner scrollbar. Use this if your layout is tight or you expect mobile readers.
<!-- Heat Shrink Tubing Size Calculator — free widget by Helixal -->
<iframe
id="helixal-calc"
src="https://www.helixalindustrial.com/embed/heat-shrink-calculator.html?ratio=3"
title="Heat Shrink Tubing Size Calculator"
width="100%"
height="1040"
loading="lazy"
style="border:0;max-width:640px;display:block"
></iframe>
<p style="font:12px/1.5 system-ui,sans-serif;max-width:640px;opacity:.75;margin:8px 0 0">
Calculator by <a href="https://www.helixalindustrial.com/heat-shrink-calculator">Helixal — heat shrink tubing size calculator</a>
</p>
<script>
window.addEventListener('message', function (e) {
if (e.origin !== 'https://www.helixalindustrial.com') return;
if (e.data && e.data.helixalCalculator && e.data.height) {
var f = document.getElementById('helixal-calc');
if (f) f.style.height = e.data.height + 'px';
}
});
</script>Match it to
your page.
Add these to the iframe URL as query parameters. Chain them with & — for example ?ratio=2&unit=in&theme=light.
| Parameter | Values | Default | What it does |
|---|---|---|---|
| ratio | 2 · 3 · 4 | 3 | Which shrink ratio is selected when the widget loads. |
| unit | mm · in | mm | Starting unit. US audiences usually want in. |
| mode | diameter · awg | diameter | Start on the diameter slider or the AWG gauge picker. |
| theme | dark · light | dark | Use light on pages with a white background. |
| compact | 1 | off | Drops the full size table. About 570px tall instead of 1020px. |
Terms of use — the short version
- Free for any site. Commercial, personal, educational, non-profit. No licence fee, no sign-up, no API key.
- Keep the credit link. Leave the "Calculator by Helixal" line visible and followable. That is the only condition.
- Do not modify the widget. Do not rehost the file or strip the attribution. Link to it here so you always get fixes.
- No warranty. The sizing maths follows published standards, but you are responsible for verifying fit on your own build.
Embedded it somewhere? Tell us where and we will keep an eye on it when the widget changes — and send you a free sample pack of 3:1 dual-wall while we are at it.
We also make
the tubing.
2:1 and 3:1 dual-wall adhesive-lined · 13 sizes, 3/32” to 2”
Ships direct from the USA — dispatched in 24 hours, delivered in 1–3 days.