Add a full mortgage calculator to your listings — in one line of HTML.
Free for agents, brokerages, MLS portals, and real estate blogs. Buyers estimate PMI, taxes, HOA, and total payment right on your page — so they stay longer and reach out sooner.
No signup, no tracking pixels, no ads inside the widget.
Not financial advice. Mortgage FV Calculator is a software calculator, not a personal-finance product or advisory service. It computes standard financial functions and displays the results for your convenience. Nothing here constitutes, or is intended to constitute, financial, investment, tax, legal, mortgage, credit, or insurance advice. Always consult a qualified professional before making any financial decision.
Why brokerages embed Mortgage FV Calculator
Keep visitors on your listings
Buyers don't need to leave your page to figure out what a home actually costs. Time-on-page and inquiry rate both go up.
PITI + PMI + HOA, done right
Most free widgets show only P&I. Mortgage FV Calculator includes taxes, insurance, PMI termination at 80% LTV, and true total monthly outflow.
Configurable per listing
Pass price, down payment, tax, insurance, and HOA as URL params. Every listing page can preload its own numbers.
Mobile-first, fast
Under 60KB after gzip on the widget shell. Auto-resizing iframe with a tiny postMessage listener — no layout jank.
White-glove branding available
Enterprise partners can hide the Mortgage FV Calculator footer, use their brand colors, and route leads to their own CRM.
Free with attribution
Free forever for any site that keeps the small "Powered by Mortgage FV Calculator" link. Removes with a paid partner plan.
Copy-paste the widget
Pick a calculator, adjust the two most common defaults, then copy the snippet into any page — WordPress, Webflow, Squarespace, custom HTML, or your MLS listing template.
Full parameter list on the embed docs page.
Auto-resizing embed
<iframe id="mfv-mortgage"
src="https://mortgagefvcalculator.com/embed/mortgage?rate=6.75&price=475000&down=47500&term=30&tax=5700&ins=1500&hoa=0"
style="width:100%;border:0;min-height:640px"
loading="lazy"
title="Mortgage calculator"></iframe>
<p style="font-size:12px;text-align:right;margin:4px 0 0">
Powered by <a href="https://mortgagefvcalculator.com/" rel="noopener">Mortgage FV Calculator</a>
</p>
<script>
window.addEventListener("message", function (e) {
if (e.data && e.data.type === "ledger:resize") {
var f = document.getElementById("mfv-mortgage");
if (f) f.style.height = e.data.height + "px";
}
});
</script>Or drop in the web component
<script src="https://mortgagefvcalculator.com/widget.js" async></script> <mortgage-fv-widget calc="mortgage" price="475000" rate="6.75"></mortgage-fv-widget>
Add theme, accent or wl attributes to match your site and remove branding.
Want to hide the "Powered by" link? See the white-label mortgage calculator — upgrade to Realtor or Business to generate a key and append ?wl=YOUR_KEY to the embed URL. Developers can also call the calculator API directly.
Free-tier terms
- Attribution: keep the small "Powered by Mortgage FV Calculator" link visible under the widget. That link is our compensation.
- Your whole site: use across the listing pages and subdomains of the domains on your plan (1 on Realtor, up to 10 on Business).
- No lead resale: visitor calculations stay private. We don't harvest their data from your site.
- Remove branding: enterprise partners on a paid plan get a white-labeled widget. Ask below.
Talk to us about a partnership
White-label branding, bulk deployment across a brokerage, CRM lead routing, or a custom integration? Tell us about your site and we'll follow up within one business day.