Understanding how your loan payments are applied over time is essential for making smart financial decisions. An amortization schedule breaks down each payment into its principal and interest components, showing exactly how your loan balance decreases month by month. Our free amortization calculator generates a complete payment schedule for any loan, whether it's a mortgage, auto loan, or personal loan. You'll see precisely how much of each payment reduces your balance versus how much goes to the lender as interest. Most borrowers are surprised to learn that early in a loan's life, the majority of each payment goes toward interest rather than principal. For a typical 30-year mortgage at 7% interest, your first payment might allocate just 22% to principal while 78% goes to interest. By the final years, those percentages flip dramatically.
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Input the total amount you are borrowing, for example, $250,000 for a home mortgage.
Enter the annual interest rate on your loan as a percentage, for example 7 for 7%.
Enter the length of the loan in years (commonly 15 or 30 years for mortgages).
See your monthly payment, total amount paid, total interest charged, and a year-by-year amortization table.
Amortization is the process of paying off debt through regular, equal payments over a set period. Each payment covers two parts: the interest owed for that period and a portion of the principal balance. With a standard amortizing loan, your monthly payment remains constant throughout the loan term. However, the composition of that payment shifts dramatically over time. Early payments are heavy on interest and light on principal. Middle payments gradually shift toward more principal. Late payments are mostly principal with minimal interest. This structure exists because interest is calculated on the remaining balance. When you owe $300,000, your interest charge is substantial. As your balance drops to $50,000, the interest portion shrinks accordingly.
The monthly payment calculation uses the formula: M = P × [r(1 + r)^n] / [(1 + r)^n - 1], where M is the monthly payment, P is the principal (loan amount), r is the monthly interest rate (annual rate ÷ 12), and n is the total number of payments. For each payment, the interest portion equals the current balance multiplied by the monthly rate. The principal portion is whatever remains after paying that interest.
Enter your loan amount: the total you're borrowing or your current balance. For mortgages, this is typically the home price minus your down payment. Enter the interest rate using the annual interest rate (APR) from your loan documents. This is different from the APY, which includes compounding effects. Select your loan term: how many years you'll take to repay. Common options include 10 years for aggressive payoff, 15 years for refinancing, 20 years for balance, and 30 years for lowest payment.
After calculating, you'll see your monthly payment amount, total payment over the loan's life, total interest paid, and a year-by-year schedule showing how the balance decreases.
Because interest compounds on the remaining balance, reducing that balance early has a magnified effect. A dollar paid toward principal in year one saves far more interest than a dollar paid in year twenty-five. Consider a $300,000 loan at 7% for 30 years: Payment 1 has $1,750 interest and $246 principal; Payment 180 (year 15) has $1,155 interest and $841 principal; Payment 360 (final) has just $12 interest and $1,984 principal.
Marcus is buying a $35,000 car and comparing 48-month versus 60-month financing at 7.5%. - 48-Month Option: $845.89/month, $5,602.72 total interest - 60-Month Option: $700.04/month, $7,002.40 total interest Result: The longer term saves $145.85/month but costs $1,399.68 more in total interest. The amortization schedules reveal why: with the 48-month loan, payment 1 has $219.17 interest and $626.72 principal. With the 60-month loan, payment 1 has $218.75 interest but only $481.29 principal. With the longer term, more of each payment goes to interest because the balance remains higher longer. Marcus chooses the 48-month option to save on total cost.
The Chen family has a $250,000 mortgage at 7% with 25 years remaining and wants to know how much they'd save by doubling their principal payment. Remaining Balance: $250,000. Interest Rate: 7%. Remaining Term: 25 years. Monthly Payment: $1,767.63. Result: Current next payment is $1,458.33 interest and $309.30 principal. By adding an extra $309 (doubling the principal portion), they pay off in 16 years, 7 months (8+ years early) and save $116,847 in interest. Their year 5 balance drops from $222,847 to $195,623, a $27,000 difference that grows exponentially as less interest accrues.
An amortization schedule is a complete table showing every payment over your loan's life. Each row displays the payment number, date, total payment, principal portion, interest portion, and remaining balance. The schedule reveals how your loan balance decreases over time and how the interest-to-principal ratio shifts from mostly interest early on to mostly principal near the end. Lenders are required to provide this schedule, but our calculator lets you generate one instantly for any loan scenario.
