Mortgage Calculator

Calculate monthly payments, total interest and first-year amortization breakdown

What is it and how does it work?

A mortgage calculator works out the monthly payment on a home loan and what it costs over time: the fixed amount you pay each month, the total interest across the whole mortgage, and a breakdown of how the first year splits between interest and principal. You enter the loan amount, the interest rate and the term, and it applies the amortization formula that lenders use, turning the headline numbers of a property purchase into a payment you can actually budget around.

A mortgage is usually the largest and longest loan a person takes, which is exactly why seeing the amortization matters: in the early years almost every payment goes to interest, and the principal barely moves. That first-year breakdown makes the cost of a long term visible and explains why a slightly lower rate or a shorter term can change the total interest by tens of thousands. This tool computes principal and interest in your browser; remember that a real monthly housing cost usually also includes property tax, insurance and sometimes association fees.

Common use cases

• Comparing mortgage options: see how a different rate or term changes the monthly payment and the total interest over the loan.
• Checking affordability: find the monthly principal-and-interest payment for a home price and deposit to judge if it fits your budget.
• Understanding early payments: use the first-year breakdown to see how little principal you pay at the start and why overpaying early helps.

Frequently asked questions

Why is almost all of my early payment interest?

Interest is charged on the outstanding balance, which is largest at the start, so early payments are mostly interest with little principal. As the balance falls each payment chips away more principal — which is why the first-year breakdown looks so interest-heavy.

Does the calculator include taxes and insurance?

It calculates principal and interest, the core of the mortgage. Real housing costs usually add property tax, home insurance and sometimes HOA or service fees, so treat the result as the loan payment and add those separately for your true monthly outlay.

How does the term affect the total cost?

A longer term lowers the monthly payment but raises the total interest, because you borrow for longer. A shorter term costs more each month but far less overall. Comparing terms shows the trade-off between monthly affordability and lifetime cost.

How much difference does the interest rate make?

On a large, long loan a small rate change has an outsized effect: even half a percentage point can shift the total interest by a significant sum over the full term. That is why it is worth comparing rates carefully before committing.

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