Amortized Loan Payment Calculator
Calculate amortized loan payments with a complete month-by-month amortization schedule. See exactly how much goes to principal vs. interest each month.
📊 Amortized Loan Payment Calculator
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⚠️ This calculator provides estimates for educational purposes only. Actual loan payments may vary based on your lender's specific terms, fees, and your credit profile. Consult a licensed financial advisor before making major financial decisions.
About This Amortized Loan Payment Calculator
An amortized loan is repaid through equal periodic payments that cover both principal and interest. Nearly all consumer loans — mortgages, car loans, personal loans, and student loans — are amortizing loans. Our calculator not only gives you the monthly payment but shows you the complete month-by-month amortization schedule.
What makes amortization fascinating is that even though your payment stays constant, the split between interest and principal changes every month. In the first months, the vast majority of your payment covers interest. In the final months, almost all of it reduces your balance.
How to Use This Calculator
Enter your loan amount — the total principal you're borrowing.
Enter the annual interest rate (APR) from your loan agreement.
Enter the loan term in months or years.
Click Calculate, then click "View Amortization Schedule" to see every single payment broken down by principal and interest.
How the Payment Formula Works
Our calculator uses the standard loan amortization formula used by all US banks, mortgage lenders, and credit unions:
// Variables: M = Monthly payment amount P = Principal (loan amount) r = Monthly interest rate (APR ÷ 12 ÷ 100) n = Total number of monthly payments (term in months)
Each payment covers two components: interest (charged on your remaining balance) and principal (which reduces your balance). In the early months, more of your payment goes toward interest. As your balance decreases, more goes toward principal — this is called front-loaded interest amortization.
Understanding Amortization and Why It Matters
Amortization is the process of gradually paying off a loan through regular scheduled payments. Each payment covers two components: the interest charged on your outstanding balance and a portion of the principal. In the early years, most of each payment goes toward interest. As the balance shrinks, more goes toward principal — this is known as a front-loaded interest structure.
Understanding how amortization works helps you make smarter borrowing decisions. On a $250,000 mortgage at 7 percent over 30 years, roughly 65 percent of every payment in year one goes toward interest. By year 20, that ratio flips. Making extra principal payments in the early years therefore has a much larger impact on total interest paid than the same extra payments made later in the loan term.
The amortization schedule in this calculator shows each payment broken down by principal and interest, along with your remaining balance over time. This is a valuable planning tool — you can see exactly when your balance drops to a key threshold, such as when you reach 80 percent loan-to-value and can cancel PMI on a mortgage.
Different loan types amortize differently. Standard installment loans amortize fully — the balance reaches zero on the final payment. Balloon loans amortize only partially, leaving a large balance due at term end. Our Balloon Payment Calculator shows how that structure differs in total cost. To see how biweekly payments accelerate amortization, try our Biweekly Payment Calculator.