Mortgage Calculator for the UK, US, Canada & Australia

A mortgage in Manchester is not approved the same way as one in Miami. The rules that decide how much you can borrow, what tax you pay on the purchase, and how affordability is stress-tested are written country by country, so we built four separate calculation engines rather than one generic calculator with different currency symbols.

In the UK, the engine applies SDLT bands, income-multiple checks, and the affordability stress tests lenders actually run before approving a loan. The US engine follows a common lender DTI rule of thumb, often quoted as 28/36, with PMI logic where it applies. Canada's version builds in the OSFI stress test every federally regulated lender must use, and Australia's follows APRA serviceability requirements with borrowing-power estimates that reflect how local banks assess a loan.

Because rules move, so do we. When a budget, a regulator, or a tax authority changes the numbers, the engines are updated and each calculator page carries a visible review date so you can see exactly how current the reference figures are. The assumptions behind every result are published in plain language, not buried in small print.

The outputs are country-specific too, not just the inputs. The UK calculator breaks down stamp duty by band and shows the total purchase cost. The US version works with property taxes and homeowner insurance the way American lenders quote them. Each result page shows the full amortization schedule, so you can see exactly how much of every payment goes to interest versus principal over the life of the loan, and export a PDF summary to take to a broker.

It is for anyone who wants to understand their position before speaking to a lender: first-time buyers doing early homework, homeowners weighing a remortgage or an upcoming renewal, and expats planning a UK purchase from abroad, who usually find that mainstream calculators assume a resident buyer and simply do not apply.

It is also for the cross-border cases most calculators ignore. People relocating between the UK, the US, Canada, and Australia can compare what their income buys in each market using the rules of that market, which is far more useful than converting one generic number into four currencies.

And it is for anyone who is tired of the price of free tools. There is no sign-up, no lead-generation form, and nothing is sent to a server. Everything runs in your browser, so you can model a scenario honestly, including the uncomfortable ones, without triggering a sales call. We do not take commissions from lenders, and the calculator does not recommend products.

One more thing: this site has a person behind it, not a content farm. Every article carries a byline linking to the founder's profile, the author page lists real credentials and contact details, and the guides and rate trackers we publish are researched against primary sources before they go live. If you want to know who wrote something, or ask a question about the numbers, the contact page reaches an actual human.

No calculator can hand you a mortgage offer. Your credit history, your full outgoings, how a valuer prices the property, and how an individual underwriter reads your case all sit outside any online tool. Lenders apply their own overlays on top of the published rules, so treat every result as the starting point for a conversation with a regulated adviser, not the final word.

We also do not predict interest rates. The calculator works with the rate you give it and shows what happens if rates rise or fall, but it will not tell you which way they are heading. Our rate articles track what has actually happened, with the figures sourced and dated, and you can check the latest on the blog below.

And when we get something wrong, we say so. In October 2026 we found factual errors in one of our Bank of England rate articles, rewrote it with the accurate timeline, and left a correction notice on the page saying exactly what the original had claimed and why it was wrong. Our editorial policy and financial disclaimer are public, and they set out plainly what this site is and is not: an educational tool, not financial advice.

Finally, treat the reference figures as a map, not the territory. The default rates and rules shown on each calculator are checked regularly and dated on the page, but they are reference figures, not live quotes, and they can move between reviews. Always confirm the numbers that matter with a lender or broker before you commit to anything, and use the calculator to understand your room for maneuver around those numbers.