15 Year Loan Monthly Payment Calculator
'/%3E%3Ccircle cx='48' cy='39' r='19' fill='%23f2c9a5'/%3E%3Cpath d='M27 35c3-16 39-17 42 2-8-8-27-9-42-2z' fill='%23374151'/%3E%3Cpath d='M21 86c5-24 49-28 56 0z' fill='%232563eb'/%3E%3Ccircle cx='41' cy='41' r='2' fill='%23111827'/%3E%3Ccircle cx='55' cy='41' r='2' fill='%23111827'/%3E%3Cpath d='M42 52c4 3 9 3 13 0' stroke='%2392400e' stroke-width='3' fill='none' stroke-linecap='round'/%3E%3C/svg%3E)
Reviewed by Calculator Editorial Team
Calculate your 15-year loan monthly payment with our free online calculator. Understand how loan amount, interest rate, and term affect your monthly payments and total interest paid.
How to Use This Calculator
Enter your loan details in the calculator panel to the right. The calculator will show your monthly payment amount, total interest paid over the loan term, and a breakdown of how your payments are allocated.
Step-by-Step Guide
- Enter the loan amount you need to borrow
- Input the annual interest rate (APR)
- Select the loan term (15 years in this case)
- Click "Calculate" to see your results
- Review the monthly payment and total interest paid
- Use the chart to visualize your loan amortization
Important Notes
This calculator assumes fixed interest rates and monthly payments. Results may vary if interest rates change or if you make extra payments.
Formula Explained
The monthly payment for a loan is calculated using the standard loan payment formula:
Loan Payment Formula
M = P [ i(1 + i)^n ] / [ (1 + i)^n - 1 ]
Where:
- M = Monthly payment
- P = Principal loan amount
- i = Monthly interest rate (annual rate divided by 12)
- n = Number of payments (loan term in years × 12)
The formula calculates the fixed monthly payment needed to pay off the loan over the specified term. The payment includes both principal and interest.
Worked Example
Let's calculate a monthly payment for a $100,000 loan at 4.5% annual interest over 15 years.
| Input | Value |
|---|---|
| Loan Amount | $100,000 |
| Annual Interest Rate | 4.5% |
| Loan Term | 15 years |
Using the formula:
- Convert annual rate to monthly: 4.5% ÷ 12 = 0.375% or 0.00375
- Number of payments: 15 × 12 = 180
- Plug values into formula: M = 100,000 [ 0.00375(1 + 0.00375)^180 ] / [ (1 + 0.00375)^180 - 1 ]
- Calculate: M ≈ $743.65
Your monthly payment would be approximately $743.65, with a total of $124,434 paid in interest over 15 years.
Frequently Asked Questions
How does the loan term affect my monthly payment?
A longer loan term means lower monthly payments but more total interest paid. A shorter term means higher monthly payments but less total interest.
Is the interest rate fixed or variable?
This calculator assumes a fixed interest rate. Variable rates would require a different calculation method.
Can I make extra payments without penalty?
Yes, most loans allow extra payments. These can reduce your principal balance and save on interest.
What happens if I can't make a payment?
Missing payments can lead to late fees, higher interest rates, or even loan default. Contact your lender immediately if you anticipate difficulty.