Convert 30 Year to 15 Year Mortgage Calculator

Converting a 30-year mortgage to a 15-year mortgage can significantly reduce your monthly payments and pay off your loan faster. This calculator helps you compare the two options and understand the financial impact of switching terms.

How to Use This Calculator

Enter your current mortgage details into the calculator on the right side of the page. The calculator will show you:

The monthly payment difference between the 30-year and 15-year terms
The total interest paid over the life of the loan
The total amount paid over the life of the loan
A comparison chart showing the payment schedule

Use the results to decide whether converting to a 15-year mortgage makes financial sense for your situation.

How the Conversion Works

When you convert a 30-year mortgage to a 15-year mortgage, you're essentially refinancing your loan with a shorter term. The key factors that affect the conversion are:

Current loan balance
Current interest rate
New interest rate (if applicable)
Loan term (30 years vs. 15 years)

The calculator uses the standard mortgage payment formula to calculate both scenarios:

Monthly Payment = P * (r(1+r)^n) / ((1+r)^n - 1) Where: P = Principal loan amount r = Monthly interest rate (annual rate / 12) n = Number of payments (loan term in years * 12)

The difference between the two scenarios shows the financial impact of switching to a shorter term.

Worked Example

Let's look at an example to see how converting from a 30-year to a 15-year mortgage affects your payments.

Scenario	Monthly Payment	Total Interest	Total Cost
30-year mortgage at 4.5% APR	$1,200	$120,000	$360,000
15-year mortgage at 4.5% APR	$2,100	$90,000	$330,000

In this example, converting to a 15-year mortgage increases your monthly payment by $900 but saves you $30,000 in interest and $30,000 in total cost over the life of the loan.

Frequently Asked Questions

Is it always better to convert to a 15-year mortgage?

Not necessarily. While you'll pay more each month, you'll save on interest and pay off the loan faster. Consider your financial situation, including your ability to make higher monthly payments and your goals for paying off the mortgage.

What are the closing costs for converting to a 15-year mortgage?

Closing costs typically range from 2% to 5% of the loan amount, depending on your lender and the type of mortgage. These costs may include appraisal fees, title insurance, and origination fees.

Can I convert to a 15-year mortgage if I have a variable-rate mortgage?

Yes, you can convert from a variable-rate mortgage to a 15-year fixed-rate mortgage. However, you may need to refinance through a new lender and pay closing costs.