15 Year House Payment Calculator
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Reviewed by Calculator Editorial Team
This 15-year house payment calculator helps you estimate your monthly mortgage payments for a 15-year loan term. Whether you're buying a home or refinancing, understanding your payment structure is key to financial planning.
How to Use This Calculator
Using the 15-year house payment calculator is simple:
- Enter the home price in the "Home Price" field
- Input your down payment amount or percentage
- Provide the loan term (15 years is the default)
- Enter your interest rate (current average rates apply)
- Click "Calculate" to see your monthly payment
The calculator will show you:
- Your estimated monthly payment
- Total interest paid over the loan term
- A breakdown of principal and interest payments
- A visualization of your payment structure
Formula Used
The calculator uses the standard mortgage payment formula:
M = P [ i(1 + i)n ] / [ (1 + i)n - 1 ]
Where:
- M = Monthly payment
- P = Principal loan amount (Home Price - Down Payment)
- i = Monthly interest rate (Annual Rate / 12 / 100)
- n = Number of payments (Loan Term in Years × 12)
This formula accounts for the amortization of your loan, showing how your payments are divided between principal and interest over time.
Worked Example
Let's calculate a 15-year mortgage for a $300,000 home with a 20% down payment and 3.5% interest rate:
- Down payment: $300,000 × 20% = $60,000
- Loan amount: $300,000 - $60,000 = $240,000
- Monthly interest rate: 3.5% / 12 = 0.0029167
- Number of payments: 15 × 12 = 180
- Using the formula: M = $240,000 [ 0.0029167(1 + 0.0029167)180 ] / [ (1 + 0.0029167)180 - 1 ]
- Calculating: M ≈ $1,424.32
Your monthly payment would be approximately $1,424.32, with $1,128.32 going toward principal and $295.94 toward interest in the first month.
Note: Actual payments may vary slightly due to rounding and lender-specific calculations.
Payment Breakdown
Here's how your payments are structured over the 15-year term:
| Year | Principal Paid | Interest Paid | Remaining Balance |
|---|---|---|---|
| 1 | $10,948 | $1,680 | $229,052 |
| 5 | $60,120 | $18,120 | $169,880 |
| 10 | $120,240 | $48,120 | $89,760 |
| 15 | $240,000 | $72,000 | $0 |
Notice how the amount going toward principal increases over time while interest decreases. This is the power of mortgage amortization.
Frequently Asked Questions
Is a 15-year mortgage better than a 30-year mortgage?
A 15-year mortgage typically has lower monthly payments but higher total interest costs. It's better if you plan to sell or refinance before the 15 years are up, or if you want to pay off your home faster. Compare both options using our side-by-side mortgage calculator.
What's the difference between fixed and adjustable rate mortgages?
Fixed-rate mortgages have the same interest rate for the entire loan term, while adjustable-rate mortgages (ARMs) have an initial fixed period followed by periodic rate adjustments. ARMs typically offer lower initial rates but come with risk of rate increases.
How does PMI (private mortgage insurance) work?
PMI is required for conventional loans when you put down less than 20% of the home price. It protects the lender if you default. PMI is usually dropped when your mortgage balance is 78% or less of the home's value.