Amortization Calculator
Calculate monthly loan payments, total interest, payoff date, yearly summary, and a full month-by-month amortization schedule.
Loan Details
Enter your loan information, then click the calculate button.
This calculator is for estimates only. Actual lender calculations may vary.
Principal and interest payment, before extra payments.
Loan Breakdown
Principal$0.00
Interest$0.00
Yearly Amortization Summary
A simple year-by-year summary of payments, principal, interest, and balance.
| Year | Payment | Principal | Interest | Ending Balance |
|---|
Monthly Amortization Schedule
Full month-by-month payment schedule.
| Month | Date | Payment | Extra | Principal | Interest | Balance |
|---|
Use this free amortization calculator to estimate your monthly loan payment, total interest, total repayment amount, payoff date, and complete loan amortization schedule.
This tool helps you understand how each payment is divided between principal and interest over the life of a loan. You can use this amortization calculator for mortgage loans, auto loans, personal loans, student loans, business loans, and other installment loans.
Enter your loan amount, interest rate, loan term, start date, and optional extra payments to see how your loan balance changes over time.
What Is an Amortization Calculator?
An amortization calculator is a tool that shows how a loan is paid off over time. It calculates the monthly payment and creates an amortization schedule that shows how much of each payment goes toward principal and how much goes toward interest.
At the beginning of many loans, more of the payment goes toward interest because the remaining balance is high. Over time, as the balance becomes smaller, more of each payment goes toward principal.
This is why an amortization schedule is useful. It helps borrowers understand the real cost of a loan and see how the balance changes month by month.
How to Use This Amortization Calculator
To use this amortization calculator, enter the loan amount, annual interest rate, loan term, start month, and start year.
You can also add an extra monthly payment or extra yearly payment if you want to see how faster payoff may affect your total interest and loan term.
After entering your values, click the Calculate Amortization button. The calculator will show your monthly payment, total interest, total payment, payoff date, payments made, interest saved, and months saved.
It also creates a yearly amortization summary and a full monthly amortization schedule. You can review the schedule, download it as a CSV file, or print it for your records.
What Is an Amortization Schedule?
An amortization schedule is a payment table that shows how your loan balance decreases over time. A typical amortization schedule includes the payment date, total payment, principal paid, interest paid, extra payment, and remaining balance.
This calculator gives you two useful views. The yearly summary gives a quick overview of each year, while the monthly schedule gives a detailed breakdown of every payment.
The monthly schedule is helpful if you want to see exactly how much interest and principal you pay each month.
Amortization Formula
The standard loan payment formula is:
M = P × [ r(1 + r)^n ] / [ (1 + r)^n − 1 ]
Where:
M = monthly loan payment
P = loan amount
r = monthly interest rate
n = total number of monthly payments
This formula estimates the fixed monthly payment needed to pay off a loan over a selected period.
Principal and Interest Explained
Principal is the original amount borrowed. Interest is the cost of borrowing that money.
For example, if you borrow money from a lender, the principal is the amount of the loan. The interest is the extra cost you pay to the lender over time.
In the early months of a loan, a larger portion of your payment may go toward interest. Later in the loan, more of your payment usually goes toward principal.
Understanding the difference between principal and interest can help you plan your loan repayment more clearly.
Why Extra Payments Matter
Extra payments can help reduce your loan balance faster. When you pay extra toward the principal, less interest may build up over time.
This can reduce your total interest cost and may shorten the payoff period. This amortization calculator includes extra monthly and extra yearly payment options so you can compare normal repayment with faster payoff options.
Even a small extra payment each month may save interest over a long-term loan.
Common Uses for an Amortization Calculator
This amortization calculator can be used for many loan types, including mortgage loans, auto loans, personal loans, student loans, business loans, home equity loans, and debt repayment planning.
Homeowners can use it to understand a mortgage schedule. Car buyers can use it to review auto loan interest. Borrowers can use it to compare different terms, interest rates, and extra payment strategies.
Amortization Calculator Example
Suppose you borrow $320,000 at a 6.5% annual interest rate for 30 years. The amortization calculator estimates your monthly principal and interest payment and shows how much interest you may pay over the full loan term.
You can then add extra monthly payments to see how much interest may be saved and how much sooner the loan could be paid off.
This makes the calculator useful for comparing payment plans before making a financial decision.
Monthly Schedule vs. Yearly Summary
The monthly amortization schedule gives a detailed breakdown of every payment. It shows payment amount, principal, interest, extra payment, and remaining balance for each month.
The yearly summary gives a simpler view. It shows total payments, total principal, total interest, and ending balance for each year.
Both views are useful. The monthly schedule is best for detail, while the yearly summary is best for quick planning.
Why Use UnitEngine.net?
UnitEngine.net is designed to make online calculators simple, fast, and easy to use. This amortization calculator works on desktop, tablet, and mobile devices.
The calculator does not show results automatically. You can enter all your loan details first, then click the calculate button when you are ready. This gives you better control and a cleaner user experience.
You can also download the amortization schedule as a CSV file or print the results for personal use.
Important Disclaimer
This amortization calculator is for informational and educational purposes only. Results are estimates and may differ from actual lender calculations, fees, taxes, insurance, payment dates, rounding methods, or loan terms.
Before making financial decisions, loan agreements, mortgage decisions, or refinancing choices, consider speaking with a qualified lender, financial advisor, or other professional.
For general consumer finance education, you can visit the Consumer Financial Protection Bureau.
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