FinanceCalcs
Amortization Calculator
Generate a full amortization schedule for any loan and see exactly how extra payments reduce your payoff time and total interest paid. Compare your standard payment plan against an accelerated strategy to find the fastest path to debt-free.
Works for mortgages, auto loans, personal loans, and any fixed-rate loan.
Amortization Calculator
Loan Amount: $0 | Monthly Payment: $0
Total Interest: $0
- Balance (Standard)
"Every dollar of extra principal payment today eliminates many dollars of future interest."
— Unknown
What is an amortization calculator?
An amortization calculator shows you how each loan payment is split between interest and principal over the life of a loan — and generates a full payment schedule so you can see exactly where your money goes each month.
One of the most powerful features is the extra payment option. Because interest is charged on the remaining balance, any additional amount paid toward principal reduces all future interest charges. Extra payments made early in a loan have the biggest impact.
The calculator runs two side-by-side simulations — your standard payment plan and your accelerated plan — so you can see exactly how much time and money you save by paying a little more each month or making a lump sum payment.
lightbulb Example Amortization Scenario
Suppose you have a $300,000 mortgage with a 6.5% interest rate and a 30-year term. Your monthly payment would be about $1,896, and you would pay roughly $382,000 in total interest over the life of the loan.
If you added just $200 extra per month, you could pay off the loan in about 24 years instead of 30 — saving over $80,000 in interest and shaving 6 years off your mortgage.
Small additional payments can make a significant difference over the long term. Use the calculator above to test different extra payment amounts and see how quickly you could pay off your loan.
Many people use an amortization calculator to plan mortgage payments, compare loan terms, and estimate the total interest they will pay over the life of a loan.
Amortization Calculator FAQs
What is an amortization schedule?
An amortization schedule is a complete table of every loan payment, showing how much goes toward principal and how much goes toward interest each month, along with the remaining balance after each payment.
Why do early payments have more interest?
Interest is calculated on your remaining balance each month. Early in the loan, the balance is highest — so more of each payment goes to interest. As the balance decreases over time, more of each payment goes toward paying down principal.
How much can extra payments save me?
It depends on your loan balance, interest rate, and how early you make the extra payments. On a 30-year mortgage, even a modest extra monthly payment can save tens of thousands in interest and shorten the loan by several years.
Can I use this for a mortgage?
Yes. This amortization calculator works for mortgages, auto loans, personal loans, and any fixed-rate installment loan. Simply enter your loan amount, interest rate, and term to generate a full payment schedule.
Amortization terminology
Principal
The original loan amount, or the remaining balance after each payment. Extra payments reduce principal directly, which lowers all future interest charges.
Amortization Schedule
A complete table of every loan payment broken down into principal and interest, with the remaining balance shown after each payment.
Extra Monthly Payment
An additional amount paid each month on top of your regular payment. Extra payments go directly toward principal and can significantly reduce your total interest and payoff timeline.
Lump Sum Payment
A one-time extra payment applied to the principal in a specific month. A lump sum early in the loan — such as a tax refund or bonus — can have an outsized impact on total interest paid.
Loan Term
The length of time over which the loan is scheduled to be repaid. With extra payments, the effective term shortens and the loan is paid off ahead of schedule.
Disclaimer: All calculators on this site are provided for informational and educational purposes only. Results are estimates based on the inputs you provide and mathematical formulas — they do not account for taxes, fees, inflation, risk, or other real-world factors that may affect financial outcomes. Past performance does not guarantee future results. Nothing on this site constitutes financial, investment, legal, or tax advice. Always consult a qualified professional before making financial decisions.
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