Amortization Calculator
View loan amortization schedule. Monthly breakdown of principal vs interest over your loan term.
Free · Runs in your browser · No signup
Sample schedule for planning only — not financial advice.
Examples to try
Fill a loan and open the principal vs interest breakdown.
How the schedule works
Fixed payment M from the standard amortization formula. Each month: interest = balance × r, principal = M − interest.
Common mistakes
- Mixing years here with the loan page’s months field.
- Expecting taxes/insurance in the schedule (this is P&I only).
- Ignoring that early payments are mostly interest.
Scope: Educational schedule for fixed-rate loans. Not financial advice. Start with the loan calculator for a quick payment total.
How to Use
Enter your values in the fields above and click Calculate to get instant results. Calculations run in your browser. Results are estimates for personal planning only.
Related Calculators
Amortization Math
An amortization schedule breaks every fixed monthly payment into interest and principal portions. In early months most of the payment covers interest — over time the split reverses.
Interest (month n) = remaining balance × monthly rate
Principal (month n) = payment − interest
Making even one extra full payment per year toward principal can shorten a 30-year loan by 4–6 years and save tens of thousands in interest.
How Early Payments Cut Total Interest
On a $250,000 mortgage at 6.5% over 30 years ($1,580/month):
Year 1: ~$16,000 interest / ~$3,000 principal
Year 10: ~$13,000 interest / ~$6,000 principal
Year 20: ~$8,000 interest / ~$11,000 principal
Year 30: Final payments are almost entirely principal
Extra payments made in the first 5 years have 3× the impact of those made in year 20.
Understanding Amortization Schedules
An amortization schedule breaks down each loan payment into principal and interest components. In the early months, most of your payment covers interest; as the balance decreases, a larger share goes toward principal. CalcSolver's amortization calculator generates a month-by-month breakdown for any loan.
On a $200,000 mortgage at 6.5% for 30 years ($1,264/month), the first payment includes about $1,083 in interest and only $181 toward principal. By year 20, interest drops to $543 and principal rises to $721 per payment. This front-loaded interest structure means early extra payments have the greatest impact on total cost.
Making just one extra payment per year on a 30-year mortgage can shave off 4-6 years and save tens of thousands in interest. Use our loan calculator to see how different terms affect your payments, or the mortgage calculator for home-specific calculations.
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Frequently Asked Questions
What is an amortization schedule?
An amortization schedule is a table showing each loan payment broken down into principal and interest portions. It shows how your balance decreases over time and how much total interest you pay.
Why does more interest go to early payments?
Interest is calculated on the remaining balance. When the balance is highest (early in the loan), interest is a larger portion of each payment. As the balance decreases, more of each payment reduces the principal.
How does extra payment affect amortization?
Extra payments toward principal reduce your balance faster, which means less interest accrues. This can shorten your loan term and save thousands in total interest.
What is the difference between amortization and simple interest?
Amortization spreads payments evenly over the loan term with interest calculated on the declining balance. Simple interest is calculated only on the original principal and does not compound.