Embed the Percent Error Calculator

Percent error against a known value, with percent difference beside it — they are different questions and get confused constantly. Set the values it should open on, then copy the iframe. Your visitors can change them; the widget recomputes against Rule Calculator and never touches your page.

Opening values

Set what the widget shows before anyone touches it. Leave a field as it is and it stays out of the URL.

Measured or estimated valueAccepted or true valueHeight — 680px

Preview

Paste this

<iframe src="https://rulecalculators.com/embed/percent-error" width="100%" height="680" style="border:1px solid #e5e5e5;border-radius:12px" loading="lazy" title="Percent Error Calculator"></iframe>
<p style="font:13px/1.5 system-ui,sans-serif;color:#666;margin:6px 0 0"><a href="https://rulecalculators.com/calc/percent-error" style="color:#666">Percent Error Calculator</a> by <a href="https://rulecalculators.com" style="color:#666">Rule Calculator</a></p>

Free for commercial use. The one condition is the credit link inside the widget, which is how the calculator stays free. Want the numbers in your own markup instead? The same calculator is a JSON endpoint, or see the full Percent Error Calculator page with its sources and working.