Free Electrical Calculators for Your Website
If you run a site for electricians, DIYers, homeowners or electrical suppliers, you can add a working electrical calculator to any page — free. Your readers get a real voltage drop or wire size result without leaving your site.
Free Voltage Drop Calculator Widget
Let readers check voltage drop in volts and percent for any wire size, distance and load, right on your page.
Free Wire Size Calculator Widget
Give readers a recommended AWG wire size from current, distance and voltage, checked against both ampacity and voltage drop.
How to add one in three steps
- 1. Go to the calculator's widget page, or use the embed builder instead.
- 2. Pick responsive or a fixed pixel width, then grab the snippet.
- 3. Drop it into your page's HTML — that's it.
Common questions
Are these free to use?
Yes, with nothing added to your page in return — no injected link, ads or tracking. The only ask, if a calculator earns its keep on your page, is a plain credit link back to it.
Will embedding one slow my site down?
It shouldn't — each calculator sits in an iframe, so it can't hold up your page's own rendering, and it brings no ad or analytics scripts with it. The optional resize script is a few kilobytes and loads without blocking anything.
Can I control the size?
Width is yours to set — responsive or a fixed pixel value. Height follows the calculator's content automatically, falling back to a fixed height if the resize script can't load.
Just want to run the numbers?
The full calculators, with worked examples and formulas: