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15 Year Fixed Mortgage Full Payment Calculator

Reviewed by Calculator Editorial Team

This 15-year fixed mortgage full payment calculator helps you determine the total amount you'll pay over the life of your loan, including principal and interest. Understanding your full payment obligation is crucial for financial planning and budgeting.

How to Use This Calculator

To use this calculator, follow these simple steps:

  1. Enter the loan amount you're seeking (the principal)
  2. Input the annual interest rate (APR)
  3. Select the loan term (15 years for this calculator)
  4. Click "Calculate" to see your results

The calculator will display your monthly payment amount, total interest paid over the loan term, and the total amount paid (principal + interest).

Formula Used

The calculation uses the standard mortgage 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 / 12) n = Number of payments (loan term in years × 12)

This formula accounts for the amortization of the loan over time, showing how much of each payment goes toward interest and principal.

Worked Example

Let's calculate a $200,000 loan at 4.5% APR over 15 years:

  1. Monthly interest rate = 4.5% ÷ 12 = 0.375% or 0.00375
  2. Number of payments = 15 × 12 = 180
  3. Using the formula:
    M = 200,000 [ 0.00375(1 + 0.00375)^180 ] / [ (1 + 0.00375)^180 - 1 ]
  4. The calculation yields a monthly payment of approximately $1,224.42
  5. Total amount paid over 15 years = $1,224.42 × 180 = $220,396
  6. Total interest paid = $220,396 - $200,000 = $20,396

Note: This is an estimate. Actual payments may vary slightly based on your lender's specific calculation methods.

Comparison of 15-Year vs 30-Year Mortgages

Here's a comparison of a $200,000 loan at 4.5% APR for both terms:

Term Monthly Payment Total Interest Paid Total Amount Paid
15 years $1,224.42 $20,396 $220,396
30 years $821.14 $123,742 $323,742

The 15-year mortgage offers lower monthly payments but pays significantly more in interest over the life of the loan. The 30-year mortgage has lower interest costs but requires more payments over time.

Frequently Asked Questions

What is a 15-year fixed mortgage?
A 15-year fixed mortgage is a home loan with a fixed interest rate that remains the same for the entire 15-year term. This provides stability in your monthly payments.
How does a 15-year mortgage compare to a 30-year mortgage?
A 15-year mortgage typically has higher monthly payments but lower total interest costs compared to a 30-year mortgage. However, you'll pay off the loan much faster, which can save you money on interest over time.
What factors affect my monthly mortgage payment?
Your monthly payment is determined by the loan amount, interest rate, and loan term. Higher loan amounts, higher interest rates, and longer terms will result in higher monthly payments.