📊 Loan Amortization Calculator
Calculate your monthly loan payments and see a complete amortization schedule. Understand exactly how each payment is applied to principal and interest over the life of your loan. Perfect for mortgages, auto loans, personal loans, and more.
What Is a Loan Amortization Calculator?
A loan amortization calculator helps you understand how your loan payments are applied over time. It shows you the monthly payment amount, total interest paid, and provides a complete amortization schedule — a detailed table showing exactly how much of each payment goes toward principal versus interest.
This calculator is perfect for:
- Mortgages — understand your home loan payment structure.
- Auto Loans — see how your car payments are applied.
- Personal Loans — plan your debt repayment strategy.
- Any Installment Loan — get a clear picture of your loan's lifecycle.
How Does Amortization Work?
Amortization is the process of paying off a loan over time through regular payments. Each payment covers both interest (the cost of borrowing) and principal (the original loan amount).
The formula used to calculate your monthly payment is:
M = P × [ r(1+r)n ] / [ (1+r)n − 1 ]
Where: M = Monthly payment, P = Principal, r = Monthly interest rate (Annual rate ÷ 12), n = Total number of payments
Key Insight: Early in the loan, a larger portion of your payment goes toward interest. As the principal balance decreases, more of your payment goes toward principal. This is why making extra payments early can save you significant interest over the life of the loan.
Why Use This Loan Amortization Calculator?
- Complete Amortization Schedule: See every single payment from start to finish.
- Extra Payment Impact: See how making extra payments can shorten your loan term and save you money.
- Visual Chart: Instantly see the breakdown of principal vs. interest.
- Detailed Breakdown: Understand exactly how each number is calculated.
- Free & Private: No registration, no data storage — all calculations are done in your browser.
❓ Loan Amortization Calculator FAQ
What is an amortization schedule?
An amortization schedule is a complete table of loan payments showing the amount applied to principal and interest for each payment, along with the remaining balance. It helps you understand how your loan is paid off over time.
How is my monthly payment calculated?
Your monthly payment is calculated using the loan amortization formula:
M = P × r × (1+r)n / ((1+r)n − 1)
Where P is the principal, r is the monthly interest rate, and n is the number of payments.
What happens if I make extra payments?
Extra payments are applied directly to the principal balance. This reduces the amount of interest you pay over time and can shorten your loan term significantly. The calculator shows you exactly how much you can save.
Why does more interest go to interest early in the loan?
Interest is calculated on the outstanding balance. Early in the loan, the balance is high, so more of your payment goes toward interest. As you pay down the principal, the interest portion decreases and more goes toward principal.
What is the difference between APR and interest rate?
APR (Annual Percentage Rate) includes the interest rate plus fees and other costs. The interest rate is the base cost of borrowing. Always compare APR when shopping for loans.
How accurate is this calculator?
This calculator provides accurate results based on standard amortization formulas. However, actual loan terms may vary based on lender policies, fees, and other factors. Use this as a planning tool and consult your lender for precise details.
Is this calculator free?
Yes, this calculator is completely free to use. No registration, no data storage — all calculations run locally in your browser.
Can I use this for mortgage calculations?
Yes! This calculator works for any installment loan, including mortgages. Simply enter your loan amount, interest rate, and term to see your full amortization schedule.
What is a good loan term?
Shorter terms (like 15 years for a mortgage) have higher monthly payments but much less total interest. Longer terms (like 30 years) have lower monthly payments but significantly more interest over the life of the loan.
How does the payment start month affect the schedule?
The payment start month determines the date shown for each payment in the amortization schedule. This helps you align the schedule with your actual payment calendar.