15 Year Fixed Loan Payment Calculator
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Reviewed by Calculator Editorial Team
Determine your monthly mortgage payments for a 15-year fixed loan with this easy-to-use calculator. Understand how different loan amounts, interest rates, and down payments affect your payments and total interest paid over the life of the loan.
How to Use This Calculator
Using the 15 Year Fixed Loan Payment Calculator is simple:
- Enter the loan amount you're seeking (the principal)
- Input the annual interest rate (APR)
- Specify the down payment amount (if any)
- Click "Calculate" to see your monthly payment
The calculator will display your estimated monthly payment, total interest paid over the 15 years, and a breakdown of how these amounts are calculated.
Formula Used
The calculation uses the standard mortgage payment formula:
Where:
- P = Loan Amount - Down Payment
- i = Annual Interest Rate / 12
- n = 15 × 12 = 180 payments
The calculator also calculates total interest paid by multiplying the monthly payment by 180 and subtracting the principal.
Worked Example
Let's calculate a monthly payment for a $200,000 loan with a 4.5% annual interest rate and $40,000 down payment:
- Principal = $200,000 - $40,000 = $160,000
- Monthly interest rate = 4.5% / 12 = 0.375% or 0.00375
- Number of payments = 15 × 12 = 180
- Using the formula:
M = 160,000 [ 0.00375(1 + 0.00375)^180 ] / [ (1 + 0.00375)^180 - 1 ] ≈ $1,025.64
Total interest paid over 15 years: ($1,025.64 × 180) - $160,000 = $184,792
Comparison of Loan Terms
Compare how different loan amounts and interest rates affect your monthly payments:
| Loan Amount | Interest Rate | Down Payment | Monthly Payment | Total Interest |
|---|---|---|---|---|
| $200,000 | 4.5% | $40,000 | $1,025.64 | $184,792 |
| $200,000 | 5.0% | $40,000 | $1,078.36 | $215,192 |
| $250,000 | 4.5% | $50,000 | $1,271.25 | $230,820 |
| $250,000 | 5.0% | $50,000 | $1,343.97 | $270,314 |
Note: These are estimates based on the standard mortgage formula. Actual payments may vary based on additional fees and closing costs.
Frequently Asked Questions
- What is a 15-year fixed loan?
- A 15-year fixed loan is a mortgage where the interest rate remains the same for the entire 15-year term. This provides stability in monthly payments compared to adjustable-rate mortgages.
- How does a down payment affect my monthly payment?
- A larger down payment reduces the principal amount you need to borrow, which typically lowers your monthly payment. However, the exact impact depends on the interest rate and loan term.
- What is the difference between APR and interest rate?
- The annual percentage rate (APR) includes the interest rate plus any additional fees, while the interest rate is the cost of borrowing. For a fixed loan, these are often the same.
- Can I pay off my 15-year loan early?
- Yes, most 15-year fixed loans allow prepayment without penalty. Paying off early can save you money on interest, but you'll have less time to build equity in your home.
- What happens if interest rates rise after I get my loan?
- Since it's a fixed-rate loan, your monthly payment and interest rate remain the same regardless of market changes. This provides stability in your budget.