Amortization Calculator

Amortization Calculator produces the full repayment schedule for a loan: every month, what the payment was, how much of it was interest, how much came off the capital, and what is left. The monthly payment is fixed, but its composition is not, and the schedule is the only way to see that clearly.

On a thirty-year mortgage at a typical rate, the first payment is mostly interest and takes only a small slice off the balance. The crossover, where more of the payment goes to capital than to interest, arrives well past the halfway point of the term. That is not a quirk of a particular lender: it is what charging interest on the outstanding balance produces, and it is why early overpayments are worth so much more than late ones.

The extra payment field shows that effect directly. An extra amount each month goes entirely off the capital, so it removes all the future interest that capital would have attracted. The message under the result reports both what it saves and how many months it takes off the term.

The yearly table is the one most people want; the month-by-month schedule is there for when you need to check a specific payment or reconcile a statement, and the whole thing downloads as a CSV for a spreadsheet.

This is arithmetic, not financial advice. It tells you what the numbers do; it cannot tell you whether a decision is right for your circumstances. Fees, taxes and local rules vary, so check anything that matters against the actual offer and speak to someone qualified before committing.

Everything is worked out inside your browser. Nothing you enter is uploaded, logged or stored, which matters for the financial calculators in particular: the figures you put into them are nobody else's business.

• Shows monthly payment, total interest, total repaid, interest per 1 borrowed and paid off in together, so you are not running it twice
• Full full schedule, month by month you can open and check
• Updates as you type, with no button to press and no page reload
• Copy the result in one click
• Download the detail as a .csv for a spreadsheet
• Free, no sign-up, and it runs entirely in your browser

The amortization calculator is used by writers, developers, students, marketers and anyone else who needs the job done once without installing software. Common cases include:

• Seeing how much of an early mortgage payment is interest
• Working out what an overpayment of 200 a month saves over the term
• Reconciling a lender statement against the expected balance
• Checking the total interest on a loan before signing
• Exporting a schedule into a spreadsheet for a budget