Mortgage Calculator

See what a property really costs over the full term, not just the monthly figure.

How Mortgage Calculator works

Estimate monthly mortgage payments, down payment, total interest and lifetime cost. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

Price, down payment, and the loan that is left

The tool takes the property price and the down payment as a percentage, works out the loan amount, then applies the standard amortising formula to produce a monthly instalment.

The down payment changes two things at once: the loan shrinks, and the total interest falls by more than proportionally because the term stays the same while the balance does not.

Why the total cost dwarfs the price

On a 15,000,000 property with 20% down at 11% over 20 years, the loan is 12,000,000 and the monthly payment is roughly 123,800. Multiply that by 240 months and the repayment is about 29.7 million — nearly two and a half times the amount borrowed.

Long terms feel affordable monthly and are expensive in total. That is the whole trade of a mortgage.

Term	Effect
10 years	High payment, least interest
20 years	Balanced for most buyers
30 years	Lowest payment, most interest

What is excluded

Property tax, insurance, maintenance, registration and arrangement fees are not included. Lenders often quote a rate that assumes a lower loan-to-value ratio, so a 5% down payment can carry a higher rate than the calculator's single field allows.

Use the amortisation page to check a lender's schedule month by month.

Good to know

Works offline once loaded, including on flights and in locked-down networks.
No file size limit beyond your device's own memory.
Free to use, with no account and no usage counter.
Results are produced locally, so they are not logged or shared with anyone.

Questions

Does it include insurance?

No — only principal and interest.

How does the down payment affect it?

A larger down payment lowers both the loan and the interest paid.

Is this the same as an EMI calculator?

Yes — the underlying formula is identical; only the fields differ.

Does it handle a variable rate?

No. Enter the current rate and treat the result as a snapshot.

How this number is produced

The calculation is price minus down payment, then the same amortising payment formula, following the standard reducing-balance loan formula. The formula is repeated here so the result can be checked by hand rather than taken on trust.

This is a calculator, not advice. No clinician, accountant or adviser has reviewed it, and it cannot see your circumstances. For anything involving health, a loan, a tax filing or a religious obligation, confirm the figure with a qualified professional or the authority that publishes the rule.

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