Free widget

Add the voltage drop calculator to your site

Drop VoltTally's NEC voltage-drop calculator into any blog post or page with one snippet of HTML. Free, responsive, and no signup — it sizes conductors to the 3% / 5% guidance right on your readers' screens.

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Scroll to explore — the embedded version auto-sizes to fit your page.

Copy & paste this

<iframe src="https://volttally.com/embed/voltage-drop" title="Voltage Drop Calculator by VoltTally" width="100%" height="900" frameborder="0" style="width:100%;border:1px solid #dbe2ea;border-radius:8px;" data-tally-embed></iframe>
<script>(function(){window.addEventListener("message",function(e){if(e.origin!=="https://volttally.com"||!e.data||e.data.type!=="tally-embed-size")return;var f=document.querySelectorAll("iframe[data-tally-embed]");for(var i=0;i<f.length;i++){if(f[i].contentWindow===e.source){f[i].style.height=e.data.height+"px";}}});})();</script>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0;">Powered by <a href="https://volttally.com/voltage-drop-calculator" target="_blank" rel="noopener">VoltTally Voltage Drop Calculator</a></p>

Free forever — no account needed
Responsive on mobile and desktop
Based on NEC Ch.9 Table 8 resistance
Just keep the small “Powered by VoltTally” link

How it works

The snippet adds two things: an iframe that loads the live calculator, and a small attribution link below it. Your readers get a working tool without leaving your page; the link is the only thing we ask you to keep.

Terms of use

Free to embed on any genuine, non-spam website. Please keep the visible “Powered by VoltTally” link and don't alter the calculator's results or disclaimers. Estimate only — not a substitute for a licensed electrician or your local code (AHJ). Questions? Get in touch.