15 vs 20-Year Mortgage Calculator

Choosing between a 15-year and 20-year mortgage can significantly impact your financial situation. This calculator helps you compare the two options by showing monthly payments, total interest paid, and total cost of the loan for each term.

How to Use This Calculator

Enter your home price, down payment, and interest rate to see how your monthly payments and total costs compare between a 15-year and 20-year mortgage. The calculator will show you:

Monthly payment for each term
Total interest paid over the life of the loan
Total cost of the loan (principal + interest)

Use the results to decide which mortgage term better fits your financial situation and goals.

Key Differences Between 15-Year and 20-Year Mortgages

While both mortgage terms offer lower interest rates than adjustable-rate mortgages, they have distinct characteristics that may affect your financial situation:

15-Year Mortgages

Shorter repayment period (15 years vs 20-30 years)
Lower monthly payments but higher monthly interest costs
More interest paid over the life of the loan
Potential for faster equity buildup

20-Year Mortgages

Longer repayment period (20 years vs 15-30 years)
Higher monthly payments but lower monthly interest costs
Less interest paid over the life of the loan
More stable monthly payments

Important Consideration

While 15-year mortgages typically have lower interest rates, they require larger monthly payments. Consider your financial situation and whether you can comfortably handle the higher payments before choosing a 15-year mortgage.

Understanding the Calculator Results

The calculator provides three key metrics for each mortgage term:

Monthly Payment

This is the amount you'll pay each month, including principal and interest. For a 15-year mortgage, this will be higher than for a 20-year mortgage of the same amount.

Total Interest Paid

This shows the total amount of interest you'll pay over the life of the loan. A 15-year mortgage will typically have higher total interest than a 20-year mortgage.

Total Cost of Loan

This is the sum of the principal (the amount you borrowed) and the total interest paid. It represents the total amount you'll pay for the loan.

Mortgage Payment Formula

The monthly payment is calculated using the 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)

Example Scenario

Let's compare a $300,000 mortgage with a 5% interest rate for both terms:

Term	Monthly Payment	Total Interest Paid	Total Cost of Loan
15-Year	$2,373.16	$213,178.40	$513,178.40
20-Year	$1,822.83	$146,738.80	$446,738.80

In this example, the 15-year mortgage has higher monthly payments but lower total interest and total cost. The 20-year mortgage has lower monthly payments but higher total interest and total cost.

Frequently Asked Questions

Which mortgage term saves more money?

A 20-year mortgage typically saves more money in total interest paid compared to a 15-year mortgage, even though the monthly payments are lower. The difference can be significant over the life of the loan.

Can I refinance to a shorter term later?

Yes, you can refinance to a shorter term at any time, but you'll need to qualify for the new loan and may face closing costs and other fees. Check with your lender for current rates and requirements.

Are there any penalties for paying off the mortgage early?

Some mortgage agreements include prepayment penalties, but these are less common today. Always check your loan agreement or ask your lender about any prepayment terms.

What factors should I consider when choosing a mortgage term?

Consider your financial situation, including your income, expenses, and savings goals. Also think about your ability to handle larger monthly payments if choosing a 15-year mortgage, and whether you might refinance to a shorter term in the future.