Free widgets
Embed a calculator on your site.
Run a finance blog, mortgage brokerage, or business newsletter? Drop any Websums calculator into your site with one line of HTML. Free, responsive, no sign-up, no API keys. Just works.
Or use the auto-resize snippet below to grow with the calculator's content.
Embedding FAQ
Does it cost anything?
No. Embeds are free and always will be. We ask only that you keep the small "Powered by Websums" credit at the bottom — that's how people find us back.
Will it match my site's design?
The embed inherits its own clean styling (light or dark — it follows the visitor's system preference). It sits inside an iframe, so it won't conflict with your CSS or vice versa.
How do I make the height auto-resize?
Add this small script anywhere on your page once: <script>window.addEventListener('message',e=>{if(e.data&&e.data.type==='websums:height'){document.querySelectorAll('iframe[src*="websums.com"]').forEach(f=>f.style.height=e.data.height+'px')}})</script> The iframe will then grow and shrink with the calculator's output automatically.
Can I embed multiple calculators on one page?
Yes — just paste the snippet for each one. Each iframe is independent.
Will it work on WordPress, Squarespace, Webflow, Wix?
Yes. Use the platform's HTML / Embed / Code block and paste the snippet inside it. Most also support iframes natively.
What about privacy?
Calculations run entirely in the visitor's browser — nothing they enter is sent to our servers. See our Privacy Policy.