For site owners and bloggers
Embed our calculators on your site, free
Three UK mortgage calculators you can put on your own pages with one line of HTML — no signup, no cost, nobody else's ads inside the widget. Each one shows a small "Free calculator by WatchMyMortgage" link at the bottom, linking back to the tool on our site — that's the only thing we ask for.
Should I break my fix?
Early repayment charge vs the saving from a better rate, month by month, with the exact breakeven point.
SVR cost calculator
What a lender's Standard Variable Rate costs per month against a rate the reader could switch to.
Overpayment allowance calculator
How much penalty-free overpayment headroom is left this year, and the date it resets.
The fine print
The figures are calculated in the visitor's own browser — nothing they type is sent to us or stored, on your site or ours. We maintain the calculator logic on our end, so an embedded widget keeps working correctly as rules change without you doing anything. Please leave the credit link in place — if you want a different size or have a question, get in touch.
This is information, not financial advice, on your site as much as on ours — worth keeping in mind if you add your own commentary around the embed.