Drop a fast, mobile-friendly mortgage payment calculator onto any site — WordPress,
Webflow, Squarespace, plain HTML — with a single <iframe>.
Full PITI breakdown, PMI, extra-payment savings and a year-by-year amortization
schedule. Free to use with a small credit link. $39 one-time removes it.
Everything below runs entirely in the visitor's browser. No data leaves the page, no cookies, no tracking, nothing to configure.
Pick your brand colour, copy, paste. That's the whole install.
Want it fully self-hosted instead of iframed from here? Download the source kit — one HTML file, no build step, no dependencies. Upload it anywhere and point the iframe at your own copy.
Principal, interest, property tax, insurance, HOA and automatic PMI while loan-to-value is above 80% — the number a buyer actually pays.
Type an extra monthly amount and it shows the exact years saved and interest avoided. This is the field that keeps people on the page.
Month-by-month maths rolled up year-by-year, so extra payments are exact rather than approximated by a formula.
Single-column below 520px, 16px inputs so iOS doesn't zoom, tabular figures, auto-height inside the iframe. ~11KB, no libraries.
| Free | $39 licence | |
|---|---|---|
| Use on your own site | ✓ | ✓ |
| Full source, self-host it | ✓ | ✓ |
| Custom accent colour | ✓ | ✓ |
| Credit link required | Yes | No |
| Use on client / commercial sites | With credit | Unlimited |
| Modify and rebrand the source | — | ✓ |
&credit=0Yes — the download link above is the complete kit and it is not gated. The $39 doesn't buy a secret file; it buys the right to run it without the credit link. Buy it and the Stripe receipt in your inbox is your proof of licence.
Because a calculator hidden behind a checkout helps nobody. Bloggers and hobby sites should just use it. Mortgage brokers and agencies building client sites can't put someone else's link on a client page — that's who the licence is for.
No. It's one HTML file with inline JavaScript, no network calls, no analytics, no cookies. Nothing a visitor types leaves their browser.
Pass any hex colour as ?accent=. If you self-host the kit, the whole
palette is CSS custom properties at the top of the file — change five lines.
Standard amortizing-loan formula for the payment, then a real month-by-month loop for the schedule and extra-payment results. PMI is estimated at 0.55%/yr of the loan while LTV is over 80% — a US market average, so treat it as an estimate, and it disappears once the down payment reaches 20%.