30 Year vs 15 Year Mortgage Payment Calculator

Deciding between a 30-year and 15-year mortgage can significantly impact your financial future. This calculator helps you compare monthly payments, total interest paid, and overall costs for both loan terms.

How to Use This Calculator

Enter your home price, down payment, interest rate, and choose the loan term (15 or 30 years). Click "Calculate" to see the comparison between the two mortgage options.

The calculator will display:

Monthly payment for each term
Total interest paid over the loan term
Total amount paid (principal + interest)
A visual comparison chart

Key Differences Between 30-Year and 15-Year Mortgages

Interest Rates

15-year mortgages typically have higher interest rates than 30-year mortgages because they're considered riskier by lenders. This means you'll pay more in interest over the life of the loan.

Monthly Payments

15-year mortgages have higher monthly payments because the loan amount is repaid faster. This can be a burden if you have other financial obligations.

Total Interest Paid

While 15-year mortgages have higher monthly payments, they pay off the loan faster, which can result in less total interest paid if interest rates are low. However, if interest rates rise, the total interest paid can increase significantly.

Refinancing Options

With a 30-year mortgage, you have more flexibility to refinance as interest rates change. With a 15-year mortgage, you're locked into the term unless you can refinance before the end.

Calculation Method

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)

Total interest is calculated by subtracting the principal from the total amount paid over the loan term.

Example Calculation

Let's compare a $300,000 mortgage with a 20% down payment (principal = $240,000) at 5% annual interest rate.

15-Year Mortgage

Monthly payment: $2,234.56
Total payments: $476,600
Total interest: $236,600

30-Year Mortgage

Monthly payment: $1,534.32
Total payments: $550,316
Total interest: $250,316

In this example, the 15-year mortgage has a higher monthly payment but pays off the loan faster, resulting in less total interest paid. However, if interest rates rise, the 30-year mortgage might become more attractive.

Frequently Asked Questions

Which mortgage term is better?: There's no one-size-fits-all answer. A 15-year mortgage can save you money if you can afford the higher payments and plan to stay in the home long-term. A 30-year mortgage offers more flexibility and lower monthly payments.
Can I refinance a 15-year mortgage?: Yes, but it's more difficult than refinancing a 30-year mortgage. You'll need to meet strict eligibility requirements and may face higher interest rates.
What happens if interest rates rise?: If interest rates increase, your monthly payments will rise, and you may end up paying more in interest over the life of the loan. This is why many people prefer 30-year mortgages.
Are there any penalties for paying off a 15-year mortgage early?: Yes, most lenders charge prepayment penalties for paying off a 15-year mortgage before the term ends. Check your loan agreement for specific details.
Can I get a 15-year mortgage with bad credit?: It's more difficult, but possible. You may need to pay higher interest rates or make a larger down payment. It's generally easier to qualify for a 30-year mortgage with less-than-perfect credit.