Short answer: Copy the iframe code on this page and paste it into any web page. You get a free, mobile-friendly rental property calculator that gives a Good, Okay or Pass verdict with cash flow, cap rate, cash-on-cash return and DSCR. Please keep the small credit link.
Frequently asked questions
Is the FirstDoor widget really free?
Yes. It is free for any website, blog or newsletter. The only ask is that you keep the small "rental property calculator by FirstDoor" credit link under it.
Will it slow down my site?
No. It loads lazily inside an iframe, only when a visitor scrolls to it, and it has no ads, cookies or third-party trackers.
Can I set the starting numbers?
Yes. Enter a default price and rent above the code and it updates automatically. Visitors can change every number.
What does the calculator show?
A Good, Okay or Pass verdict plus monthly cash flow, cap rate, cash-on-cash return and DSCR. A button opens the full breakdown on FirstDoor.
Can I resize it?
Yes. It is responsive. Change max-width in the code to fit your column; 660 pixels of height fits it on phones and desktops.