Amortization Schedule Generator
An amortization schedule reveals the hidden truth of every fixed-rate mortgage: in the early years the overwhelming majority of each payment services interest, and only a trickle chips away at the principal you actually owe. This calculator computes your fixed monthly payment from the loan amount, annual interest rate, and term, then rolls those payments across the full life of the loan to expose the total interest you will pay and the grand total the loan will cost you. Understanding that curve is powerful. It shows why even a fractionally lower rate saves tens of thousands over thirty years, why extra principal payments early on are so devastatingly effective at cutting total interest, and how a shorter term dramatically reduces lifetime cost. Whether you are underwriting an investment property or your own home, run the numbers here to see exactly where your money goes.
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Results update live as you type. Estimates only — not financial, tax, or investment advice.
The Formula
M = P · [ r(1 + r)ⁿ ] ÷ [ (1 + r)ⁿ − 1 ]
Understanding the Amortization Schedule Generator
An amortization schedule exposes a truth that surprises most borrowers: in the early years of a fixed-rate loan, the overwhelming majority of each payment goes to interest, not principal. Your payment stays constant, but its split shifts gradually — only in the second half of the loan does principal finally dominate. That front-loading is why the total interest on a 30-year mortgage can rival or exceed the amount you originally borrowed, and why even a small difference in interest rate compounds into tens of thousands of dollars over the life of the loan.
Understanding the curve reveals where you have leverage. Extra principal payments made early are extraordinarily powerful, because each dollar erases all the future interest that dollar would have accrued. Making one additional payment a year, switching to biweekly payments, or choosing a 15-year term over a 30 can slash total interest dramatically while building equity far faster. Use the outputs here to see exactly how much a change in rate, term, or prepayment alters your lifetime cost.
Frequently Asked Questions
Why is most of my early mortgage payment interest?
Interest is charged on the outstanding balance, which is highest at the start of the loan. Since your balance is large in the early years, most of each fixed payment covers interest, leaving little for principal. As the balance shrinks, the interest portion falls and principal accelerates — the essence of amortization.
How can I reduce the total interest I pay?
Pay extra toward principal, especially early; make biweekly instead of monthly payments; choose a shorter term like 15 years; or refinance to a lower rate. Because early principal reductions eliminate all the future interest that balance would have accrued, even modest extra payments produce outsized savings over the loan's life.
Is a 15-year or 30-year mortgage better?
A 15-year loan carries a higher monthly payment but a lower rate and dramatically less total interest, building equity quickly. A 30-year loan offers lower payments and more flexibility but costs far more over time. The right choice depends on your cash-flow needs and whether you can invest the payment difference at a higher return.