Amortization Calculator

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Loan Amortization Calculator

Estimate each loan payment, see the lifetime cost of interest, and follow your remaining balance from the first payment to payoff. Adjust the loan term, payment frequency, or extra payments to compare scenarios in seconds.

Build your loan schedule

Enter your loan details. Extra payments are optional.

Loan term
years
months
%
Optional extra payments
$
Added to every scheduled payment.
$
Applied after each payment year.
$
Payment breakdown

Your amortization schedule

Early payments usually contain more interest. As the balance falls, more of each payment reduces principal.

Remaining loan balance

PaymentDatePaymentPrincipalInterestExtraBalance
Enter loan details and calculate to generate your schedule.
Understand the numbers

What loan amortization means

Loan amortization is the gradual repayment of borrowed money through scheduled payments. With a typical fixed-rate amortizing loan, every payment contains two parts: interest charged on the outstanding balance and principal that reduces what you owe.

An amortization schedule lists that split for each payment. Interest is usually highest near the beginning because the balance is largest. Over time, the balance declines, the interest charge becomes smaller, and more of the same scheduled payment goes toward principal.

A longer term can make each payment smaller, but it usually keeps the balance outstanding for longer and may increase total interest. Comparing schedules helps borrowers see that tradeoff before choosing a term or adding extra principal payments.

Fixed-payment formulaPayment = P × [r(1+r)ⁿ] ÷ [(1+r)ⁿ − 1]

P is principal, r is the periodic interest rate, and n is the number of payments.

Practical guide

How to use the amortization calculator

Calculate step by step

  1. Enter the amount you plan to borrow.
  2. Add the full loan term in years and months.
  3. Enter the annual fixed interest rate.
  4. Select monthly, biweekly, or weekly payments.
  5. Set the loan start date.
  6. Add optional extra payments if needed.
  7. Select Calculate schedule.
  8. Review payment, total interest, and total paid.
  9. Use the table to follow principal, interest, and remaining balance.

Why this calculation is useful

  • Estimate a regular payment before speaking with a lender.
  • Understand the full cost of borrowing, not just the advertised rate.
  • Compare shorter and longer loan terms.
  • See how each payment is divided between principal and interest.
  • Test how extra principal may affect interest and payoff timing.
  • Plan a household or business budget with clearer numbers.
  • Compare loan scenarios using the same assumptions.

Pros

  • Fast, repeatable estimates.
  • Clear principal-and-interest breakdown.
  • Full payment and annual schedule views.
  • Easy scenario comparisons.
  • Useful support for budgeting and planning.

Limits to keep in mind

  • Results depend on accurate inputs.
  • Actual lender calculations and payment dates may differ.
  • Taxes, insurance, fees, and penalties are not included.
  • Variable-rate, balloon, and interest-only loans need different models.
  • An estimate is not a loan offer or financial advice.
Common questions

Amortization calculator FAQ

Straightforward answers about payment calculations, loan schedules, and the limits of an estimate.

1. What is an amortization calculator?

It is a tool that estimates the scheduled payment for a fixed-rate loan and shows how each payment is divided between principal and interest. It also estimates the remaining balance after every payment.

2. How does an amortization calculator work?

It combines the loan principal, periodic interest rate, and number of payments in a standard fixed-payment formula. It then applies each payment to accrued interest first and reduces the balance with the remaining principal amount.

3. How is the monthly loan payment calculated?

For a fixed-rate loan, the payment is calculated so the balance reaches zero after the selected number of payments. The result assumes the interest rate stays unchanged and payments are made on schedule.

4. How much interest will I pay over the life of the loan?

The result panel estimates lifetime interest by adding the interest charged in every scheduled period. The amount changes when you adjust the rate, term, payment frequency, or extra principal.

5. What is the difference between principal and interest?

Principal is the amount borrowed and still owed. Interest is the cost charged by the lender for providing the funds. Each standard amortized payment normally includes both.

6. Does a longer loan term reduce regular payments?

Usually, yes. Spreading repayment across more periods generally lowers each scheduled payment, assuming the principal and interest rate remain the same.

7. Does a longer loan term increase total interest?

It often does because interest accrues over more time and the balance falls more slowly. Compare both the regular payment and total interest before choosing a term.

8. Can I use this calculator for different loan types?

You can use it for many fixed-rate, fully amortizing loans such as conventional mortgages, auto loans, and personal loans. It is not designed for variable-rate, interest-only, revolving-credit, or balloon-payment products.

9. Does the calculator include taxes, insurance, or lender fees?

No. The calculation covers principal and interest plus any extra principal you enter. Property taxes, insurance, origination fees, closing costs, late charges, and prepayment penalties are outside this estimate.

10. How accurate are amortization calculator results?

The math is accurate for the entered assumptions, but real lender schedules can differ because of rounding rules, accrual methods, payment dates, fees, or product terms. Confirm final figures with the lender.

Financial disclaimer: Results are estimates for educational and planning purposes. Actual lender terms may differ. Taxes, insurance, fees, penalties, and other costs are not included unless expressly shown. Verify all terms and figures with your lender before making a financial decision.

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