Free financial calculator widgets for your site

Every widget is two pieces: an <iframe> that renders the calculator, and a one-line credit paragraph that sits outside the iframe, directly underneath it. That placement isn't decorative — a link inside an iframe carries no SEO value to either of us, so the credit line lives in your page's own HTML, where it actually counts as a link. Leave it in place and linked, and the widget is yours to use, free, on as many pages as you like.

Two settings matter more than the rest:

• Height is fixed, not automatic. An iframe can't resize itself to fit content on another domain, so each snippet below ships with a specific pixel height that fits that calculator's layout with room to spare. If your own page runs narrower than 720px the calculator's internal layout stacks to fit — you generally won't need to change the height for that. If you add fields or notice clipping at unusual zoom levels, increase it; a little extra whitespace beats a cut-off receipt.
• loading="lazy" is already in the snippet. The iframe only loads once it's scrolled near the viewport, so a widget placed lower on a long page doesn't cost you anything in initial load time. Leave the attribute in place.

Each snippet is the exact code from that calculator's own page — copy straight from here, or from the "Embed this calculator" section at the bottom of any calculator page.

Free with attribution. Use any of the six widgets on any site, personal or commercial, at no cost. The only condition is the credit paragraph that ships with each snippet, linked and visible under the iframe. Don't strip the link, don't hide it with CSS, and don't edit the iframe's src — everything else about placement (page, surrounding copy, column width up to the 720px max) is yours to decide.

Each widget is the live calculator, so updates to the math or layout on our end show up in your embed automatically — there's nothing to re-copy later unless we change a snippet's recommended height, and this page is the canonical source if that happens. The embed itself carries no cookies and sets nothing in your visitors' browsers beyond what the calculator's own inputs need to run.

Something not rendering right, or want a calculator that isn't on this list embedded too? Tell us.