What the tool does, how to run it, and what to expect from the result.
See the payment during an interest-only period, how much it jumps when principal repayments start, and the extra interest compared with a normal mortgage. The math updates instantly and runs on your device, so it is fast, private, and available offline.
A quick way to understand who this helps, what it solves, and where it connects next.
Shoppers, students, freelancers, and anyone who needs a quick, private calculation.
Fast everyday math without a spreadsheet, app install, or sign-up.
Short answers for the questions people usually have before trying a utility like this.
Yes. It is completely free, with no sign-up, no watermark, and no usage limits.
No. Amounts are currency-neutral and use the same unit across all inputs, so it works in any country.
Loan × annual rate ÷ 12. $400,000 at 6.5% is $2,166.67 a month. None of it reduces the balance, so after a 10-year interest-only period the full $400,000 is repaid over the remaining 20 years at $2,982.29 a month.
Yes. Because the balance stays high for longer, the loan above costs about $65,600 more in interest than a standard 30-year repayment mortgage.
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Enter your numbers and the result updates live in your browser. Nothing is uploaded and no server is used.
Calculations run locally in your browser. Amounts are shown without a currency symbol so they work anywhere.