Is the calculator really free to embed?

Yes, completely free for any non-commercial or commercial site. The only condition is that you keep the small attribution line that ships in the embed snippet - it's already there by default; you just paste the code and go.

Can I customize the width or height?

Yes. Change the width and height attributes on the iframe. We recommend width=100% (responsive) with max-width 680px, and height 500px which fits the calculator without scrolling on mobile.

Does the calculator update automatically?

Yes. Your iframe always loads the latest version from pluginsolarhub.org, so when we update state electricity rates or the math model, your embed updates instantly with no work on your end.

Solar blogs, HOA and community sites, local news writing about energy bills, energy newsletters, sustainability sites, and any U.S.-focused content where readers want to see real numbers for their own state. It's also great as a sidebar widget.

Embed Our Free Solar Savings Calculator (2026)

A free, no-signup, mobile-friendly solar savings calculator for your blog, HOA site, local newsroom or energy newsletter. One iframe. US 50-state rates. Updated by us — instantly live on your page.

Last updated: June 2026 · Region: United States · Use anywhere, commercial or not

What it does

Lets your readers plug in their state, system size and kit price — and instantly see yearly kWh production, yearly $ savings, and payback in years. Same calculation we use on our own savings calculator page: transparent math, no signup, no email wall.

50-state electricity rates baked in — defaults to US average
Mobile-friendly — responsive grid on phones, full layout on desktop
No tracking or third-party scripts in the widget itself
Auto-updates when we refresh rates — no work on your end
Lightweight — under 10 KB, loads with loading="lazy"

Live preview

This is the actual widget — try it:

Embed code

Copy this into any HTML page. Works in WordPress (Custom HTML block), Ghost, Substack, Webflow, Squarespace and plain HTML.

<!-- Solar Savings Calculator by PlugInSolarHub -->
<iframe src="https://pluginsolarhub.org/widget/calculator/" width="100%" height="500" style="max-width:680px;border:1px solid #e2e8f0;border-radius:10px" loading="lazy" title="Solar Savings Calculator"></iframe>
<p style="font-size:13px">Free <a href="https://pluginsolarhub.org/savings-calculator/">solar savings calculator</a> by <a href="https://pluginsolarhub.org/">PlugInSolarHub</a></p>

Terms of use (the short version)

Free. Use on commercial or non-commercial sites without asking.
Keep the attribution line. The small "Free solar savings calculator by PlugInSolarHub" paragraph that ships with the embed must stay visible. That’s the only thing we ask.
Don’t remove the in-widget link. The small footer link inside the iframe is part of the widget — please don’t use CSS to hide it.
No guarantee. Outputs are estimates based on state average electricity rates and a transparent formula. Not financial advice.
We may update. The widget always loads the current version from pluginsolarhub.org. We can change layout, rates, or behavior without notice; the math stays simple and transparent.

Who’s this for?

Solar & energy bloggers

Drop the calculator in any “is solar worth it?” post and your readers can run their own numbers without leaving your page.

HOA & community sites

A neutral, branded-by-someone-else tool that helps residents understand whether plug-in solar makes sense for their unit.

Local news / energy beat

When you cover a utility rate hike or a new solar law, embed the calculator so readers see what the numbers mean for them.

Newsletter sites

Sustainability newsletters, weekend reads — the widget renders fine in Ghost, Substack, Beehiiv and Mailchimp landing pages.

FAQ

Is the calculator really free to embed?: Yes, completely free for any non-commercial or commercial site. The only condition is that you keep the small attribution line that ships in the embed snippet — it’s already there by default; you just paste the code and go.
Can I customize the width or height?: Yes. Change the width and height attributes on the iframe. We recommend width="100%" (responsive) with max-width:680px, and height="500" which fits the calculator without scrolling on mobile.
Does the calculator update automatically?: Yes. Your iframe always loads the latest version from pluginsolarhub.org, so when we update state electricity rates or the math model, your embed updates instantly with no work on your end.
Who is this for?: Solar blogs, HOA and community sites, local news writing about energy bills, energy newsletters, sustainability sites, and any U.S.-focused content where readers want to see real numbers for their own state. It’s also great as a sidebar widget.
Can I see how the math works?: Yes — the full formula and assumptions are documented on our main savings calculator page. We use: yearly production = system watts × production-per-watt, yearly savings = production × your electricity rate, payback = kit price ÷ yearly savings.

Want to talk about a custom embed? Same widget but with a tweak (your branding, different default state, removed inputs) is available on request — reach us via the About page. Default embed stays free either way.