Amortization Schedule Calculator

About the Amortization Schedule Calculator

An amortization schedule is a period-by-period table showing how each payment is split between principal and interest. Early in a fixed-rate loan, the interest portion is usually larger because the outstanding balance is still high. As the balance declines, more of each payment shifts toward principal.

Understanding the schedule makes it easier to see the full borrowing cost, the pace of balance reduction, and the trade-offs between loan terms or payment frequencies. It is useful as an independent planning view when you want to compare scenarios, sanity-check disclosures, or see how much of the payment is really reducing the balance in the early years.

This calculator generates a full period-by-period breakdown for any loan amount, rate, and term. You can toggle between monthly and biweekly payment frequencies to compare how accelerated payments affect your total interest and payoff timeline.

When This Page Helps

Most borrowers only know their monthly payment — not how it is allocated. An amortization schedule exposes the interest-heavy early years and helps you decide whether extra payments, a shorter term, or a different rate would save meaningful money. Comparing monthly versus biweekly schedules shows how one small change can shave years off your loan.

How to Use the Inputs

1. Enter your loan amount (the financed principal).
2. Enter the annual interest rate.
3. Set the loan term in years.
4. Choose a payment frequency: monthly or biweekly.
5. Review the summary showing payment amount, total interest, and payoff date.
6. Scroll the amortization table to see each period's principal, interest, and remaining balance.

Example Calculation

Tips & Best Practices

• Compare 15-year versus 30-year schedules — the shorter term dramatically reduces total interest despite higher payments.
• Look at the interest portion of your first few payments to understand why early extra payments are so powerful.
• Biweekly payments can shorten the repayment path because 26 half-payments per year equal 13 monthly-equivalent payments.
• Use the schedule to plan lump-sum extra payments at years when interest savings are maximized.
• Check your actual lender statement against this schedule to verify your payments are being applied correctly.
• Save or print your schedule as a reference when discussing refinancing options with lenders.

Understanding Amortization

Amortization means spreading a loan into a series of fixed payments over time. Each payment covers both interest charges and principal repayment. The formula ensures the loan is fully paid off by the last payment, with no remaining balance.

Monthly vs Biweekly Schedules

Monthly payments are the standard — 12 payments per year over the loan term. Biweekly schedules split each monthly payment in half, paid every two weeks. Because there are 26 biweekly periods per year (not 24), you effectively make one extra monthly-equivalent payment annually. That often shortens the payoff timeline, though the exact effect depends on the starting rate, term, and loan balance.

Reading Your Schedule

The most revealing columns are the interest and principal portions. Watch how the ratio shifts over time. The crossover point — where principal exceeds interest in each payment — depends on the loan rate and term, but on long fixed-rate mortgages it often arrives much later than borrowers expect.

Frequently Asked Questions

• What is an amortization schedule?

  An amortization schedule is a table listing every payment over the life of a loan. Each row shows the payment number, amount allocated to interest, amount allocated to principal, and the remaining balance. It provides a complete roadmap of how the loan is paid off.

• Why is so much interest paid early in the loan?

  Interest is calculated on the outstanding balance. Early in the loan, the balance is highest, so the interest charge is largest. As you pay down principal, interest charges shrink and more of each payment goes toward principal. This is called front-loaded interest.

• How does biweekly payment help?

  Biweekly payments divide your monthly payment in half and pay it every two weeks. Since there are 52 weeks per year, you make 26 half-payments — equivalent to 13 monthly payments instead of 12. That one extra payment per year reduces total interest and shortens the loan by several years.

• Can I use this for auto loans or personal loans?

  Yes. Amortization works the same for any fixed-rate, fixed-term loan. Enter the loan amount, rate, and term regardless of the loan type. The schedule will be accurate for mortgages, auto loans, personal loans, and student loans with fixed terms.

• How accurate is this schedule compared to my lender?

  This calculator uses the standard fixed-rate amortization formula. A lender or servicer statement may still differ slightly because of rounding, payment posting dates, escrow handling, or loan-specific servicing rules.

• What happens to the schedule if I make extra payments?

  Extra payments reduce the principal balance faster, which reduces interest on subsequent payments. This shortens the loan term and reduces total interest paid. Use our Extra Mortgage Payment Calculator for that specific scenario.