15 Years Mortgage Calculator

Use our 15-year mortgage calculator to determine your monthly payments, total interest paid, and loan amortization schedule. This tool helps you understand the financial commitment of a 15-year mortgage compared to longer-term loans.

How the 15-Year Mortgage Calculator Works

A 15-year mortgage is a home loan that's repaid over 15 years instead of the more common 30-year term. The calculator determines your monthly payments based on the loan amount, interest rate, and term length.

The calculation uses the standard mortgage formula that accounts for the principal, interest, and loan term. The shorter repayment period means higher monthly payments but also lower total interest paid over the life of the loan.

Key Features

Calculate monthly payments for any loan amount and interest rate
View total interest paid over the 15-year term
See the complete amortization schedule
Compare different interest rates and loan amounts

The Mortgage Formula

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 divided by 12)
n = Number of payments (loan term in years × 12)

For a 15-year mortgage, n would be 180 (15 years × 12 months). The calculator applies this formula to determine your monthly payment based on the inputs you provide.

Worked Example

Let's calculate a 15-year mortgage for $200,000 at 4.5% interest:

Example Calculation

Monthly interest rate = 4.5% ÷ 12 = 0.375% or 0.00375

Number of payments = 15 × 12 = 180

Monthly payment = $200,000 [ 0.00375(1 + 0.00375)¹⁸⁰ ] / [ (1 + 0.00375)¹⁸⁰ - 1 ]

Calculated monthly payment = $1,425.28

This example shows that with a $200,000 loan at 4.5% interest, your monthly payment would be approximately $1,425.28 over 15 years.

15-Year vs. 30-Year Mortgages

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

Term	Monthly Payment	Total Interest Paid	Total Cost
15 Years	$1,425.28	$117,190.40	$317,190.40
30 Years	$943.18	$184,984.80	$384,984.80

The 15-year mortgage has higher monthly payments but lower total interest and total cost. This makes it an attractive option for homebuyers who can afford the higher payments and want to pay off their mortgage faster.

Frequently Asked Questions

What is a 15-year mortgage?

A 15-year mortgage is a home loan that's repaid over 15 years instead of the more common 30-year term. It typically requires a higher down payment and has higher monthly payments but also lower total interest paid over the life of the loan.

How do I qualify for a 15-year mortgage?

Qualifying for a 15-year mortgage is similar to qualifying for a 30-year mortgage. Lenders will consider your credit score, income, debt-to-income ratio, and employment history. Some lenders may require a higher credit score or larger down payment for 15-year mortgages.

What are the advantages of a 15-year mortgage?

The main advantages of a 15-year mortgage are lower total interest paid, faster payoff, and potential tax benefits. The higher monthly payments may be difficult for some borrowers, but the lower total interest can save thousands of dollars over the life of the loan.

What are the disadvantages of a 15-year mortgage?

The main disadvantages are higher monthly payments and the risk of interest rate increases. If interest rates rise, your monthly payments will increase, which may be difficult for some borrowers. Additionally, the shorter term means you'll be making larger payments for a longer period.

Can I refinance a 15-year mortgage to a 30-year mortgage?

Yes, you can refinance a 15-year mortgage to a 30-year mortgage. This can lower your monthly payments but will result in paying more interest over the life of the loan. It's important to consider your financial situation and goals before making this decision.