What your visitors get
The real calculator, not a picture of one. It sizes itself to the space you give it, works on a phone, and carries a link back here for the method, the sources and the line about where the number stops being reliable. This is the pace converter, running live on this page exactly as it would on yours.
Live embed · /tools/embed/pace
The one line
Paste this where you want the calculator. Change data-tool to
the calculator you want — the slugs are in the table below. The second line is the
attribution; keep it, that is the whole price.
<script src="https://enduranceproof.com/tools/embed.js" data-tool="pace" async></script>
<p><a href="https://enduranceproof.com/tools/pace">Pace converter</a> by EnduranceProof — with its sources and where it bends.</p>The six calculators
| Calculator | data-tool | Frame height |
|---|---|---|
| Pace converter | pace | 651 px |
| Race time predictor | race-predictor | 479 px |
| Heart-rate zone calculator | hr-zones | 522 px |
| Climb calculator | climb | 927 px |
| Aero calculator | aero | 1883 px |
| VO2max calculator | vo2max | 867 px |
The height only matters if you use the plain frame below; with the script the frame measures itself and grows when a calculator opens a longer table.
If your platform strips scripts
Some site builders remove <script> tags from a page.
A plain frame works everywhere and needs no JavaScript on your side. The only thing you lose
is the automatic resizing, so give it the height from the table.
<iframe src="https://enduranceproof.com/tools/embed/pace" title="Pace converter — EnduranceProof" width="100%" height="651" style="border:0" loading="lazy"></iframe>
What it does, and what it will never do
- It sets no cookies and measures nothing on your page. No analytics, no fingerprinting, no third-party scripts. Our own visitor counter is deliberately switched off inside the frame, because your visitors never agreed to anything with us.
- It loads from enduranceproof.com and nothing else. One frame, one stylesheet, one small script — no fonts, trackers or ad code riding along.
- It stays current. Fix a formula or add a source here and your embed follows the same day; there is no copy on your server to go stale.
- It will not compete with your page. The frame points its canonical link at our own tool page, so search engines credit one page, not two.
- No login, no key, no upsell. We do not know who embeds what, and there is nothing to buy.
The terms, in plain words
- Use it on any site, commercial or not.
- Keep the attribution line that comes with the snippet.
- Do not alter the numbers or strip the "where it bends" note — that note is half the reason these tools exist.
- Missing a calculator you would use? Write to info@enduranceproof.com. That is how three of these six got built.
Prefer to look around first? All six calculators are here, each with its formula, its sources and the point where it stops being reliable.