Amortization Calculator

An amortization schedule shows exactly how much of each payment goes to interest.

What this calculator does

Enter loan amount, interest rate and term for a full schedule.

When to use this calculator

This calculator earns its keep at decision points: before accepting a loan, comparing investment platforms, or negotiating salary. The difference between the headline figure and the true cost or return is only visible with accurate arithmetic.

Common mistakes

The most consequential mistake is comparing financial figures that are not on the same basis — gross versus net, before-tax versus after-tax, or nominal versus inflation-adjusted. Always check whether figures you are comparing use the same definition.

Real-world scenarios

A first-time buyer models three scenarios before making an offer: 10%, 15%, and 20% deposit on a £280,000 property. The calculator shows exactly how the monthly payment and total interest cost change with each deposit level, making the decision visible rather than speculative.

Frequently asked questions

What is an amortization schedule?

A schedule of all payments, split per period into interest and principal.

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