Free website widgets

Embed a calculator on your website

Give readers an interactive calculator without rebuilding or maintaining the formula. Each widget uses the same tested definition as its canonical Trusty Calculator page.

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These first five widgets reuse the same tested definitions as their canonical pages.

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Celsius to Fahrenheit Calculator

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Embed code

Paste this HTML into your page. The optional script only resizes the iframe.

<iframe
  data-trusty-calculator="op-conversion-celsius-to-fahrenheit"
  src="https://trustycalculator.com/embed/op-conversion-celsius-to-fahrenheit"
  title="Celsius to Fahrenheit Calculator — Trusty Calculator"
  width="100%"
  height="760"
  loading="lazy"
  referrerpolicy="origin"
  sandbox="allow-scripts allow-same-origin"
  allow="clipboard-write"
  style="display:block;max-width:100%;border:1px solid #bdcce0"
></iframe>
<script>
(() => {
  const script = document.currentScript;
  const frame = script && script.previousElementSibling;
  if (!(frame instanceof HTMLIFrameElement)) return;
  window.addEventListener('message', (event) => {
    if (event.origin !== 'https://trustycalculator.com' || event.source !== frame.contentWindow) return;
    const message = event.data;
    if (!message || message.type !== 'trusty-calculator:resize' || message.version !== 1 || message.calculatorId !== 'op-conversion-celsius-to-fahrenheit') return;
    const height = Number(message.height);
    if (!Number.isFinite(height)) return;
    frame.style.height = Math.min(1600, Math.max(360, Math.ceil(height))) + 'px';
  });
})();
</script>

The iframe does not load ads or analytics and never sends calculator inputs or results to the publisher page. Attribution is branded and uses rel="nofollow".

Publisher-friendly by default

No account, cookies, advertisements, or analytics inside the iframe.
No calculator inputs or results are posted to the publisher page.
Responsive height messages verify both the Trusty origin and the exact iframe window.
Branded attribution uses a nofollow link to the full calculator and its sources.

Choose a calculator

Celsius to Fahrenheit Calculator

Embed code

A small, transparent embed