What is a Amortization Calculator?
An Amortization Calculator generates a complete payment-by-payment schedule of your loan, showing exactly how each monthly payment is split between interest and principal — and how your remaining balance decreases over time. It is the most detailed view of a loan's true cost.
Formula Used in the Amortization Calculator
Monthly Payment
M = P × r(1+r)ⁿ / ((1+r)ⁿ − 1)
For each period t:
• Interest Payment = Remaining Balance × r
• Principal Payment = M − Interest Payment
• New Balance = Old Balance − Principal Payment
Where r = monthly rate, n = total payments
All calculations are performed in your browser using validated financial formulas. Results may vary slightly from lender quotes due to rounding and additional fees not included here.
How to Use the Amortization Calculator (Step-by-Step)
Follow these simple steps to get your results in seconds:
1
Enter your loan amount (or home price minus down payment).
2
Enter the annual interest rate.
3
Select the loan term in years.
4
Click Calculate to generate the amortization schedule.
5
Review the month-by-month breakdown table.
6
Use the chart to visualize how your balance decreases over time.
Pro Tip: Try different input values to model multiple scenarios before making your final financial decision.
Example Calculation
Here is a real-world example showing how the Amortization Calculator works:
Loan: $200,000 | Rate: 5% | Term: 30 years
Month 1: Interest = $833.33 | Principal = $240.98 | Balance = $199,759.02
Month 12: Interest = $825.55 | Principal = $248.76 | Balance = $197,589.45
Year 10: Balance ≈ $162,765
Total Interest: $186,511
This example is for illustrative purposes only. Your actual results will vary based on your specific inputs.
Real Life Use Cases
The Amortization Calculator is used daily by people in a wide range of situations:
Homeowners wanting to track loan payoff progress
Borrowers planning to sell before the loan ends
Investors calculating true cost of leveraged real estate
Anyone considering paying extra toward principal
Accountants needing interest figures for tax purposes
Tips for Accurate Calculations
Get the most out of the Amortization Calculator with these expert tips:
Your first payment is almost entirely interest — this is normal
Paying just $100 extra/month can cut years off a 30-year mortgage
Refinancing makes sense when you can lower your rate by at least 1%
Keep your amortization schedule for tax records
Review your schedule annually to track equity growth
Ask your lender if they charge prepayment penalties
Frequently Asked Questions — Amortization Calculator
Here are the most common questions about the Amortization Calculator:
Amortization is the process of gradually paying off a debt over time through regular payments. Each payment covers the interest owed plus reduces the outstanding principal.
Because interest is calculated on the remaining balance. Early in the loan, the balance is high, so interest is high. As you pay down the principal, the interest portion shrinks.
Yes. Lenders are required to provide a loan amortization schedule. You can also generate one instantly here and compare it with your lender's figures.
Extra payments reduce the principal directly, which reduces future interest charges and shortens the loan. Even small extra amounts make a big difference over a 30-year term.
Negative amortization occurs when your payment is less than the interest owed, so the unpaid interest is added to your principal. This increases what you owe over time and should be avoided.
For fixed-rate loans, yes. For adjustable-rate mortgages (ARMs), the schedule changes when the rate adjusts.
It depends on your loan details. For a $300,000 30-year loan at 6.5%, after 5 years you've paid roughly $18,000 in principal — much less than the interest paid in the same period.
Mortgages use simple interest calculated monthly on the outstanding balance. It is not compounded the same way savings accounts are, but the amortization structure front-loads interest payments.
Absolutely. The amortization formula is the same for any installment loan. Just enter the loan amount, rate, and term.
Amortization refers to paying down a loan over time. Depreciation refers to the reduction in value of a physical asset over time. Both are accounting concepts but apply to different things.