15 Year Mortgage Rates Calculator Refi

Use this 15-year mortgage rates calculator to estimate your potential refinancing costs and savings. Compare current rates with historical data to make informed decisions about refinancing your mortgage.

How to Use This Calculator

To use this calculator, follow these simple steps:

Enter your current mortgage balance in the "Current Loan Amount" field.
Select your current interest rate from the dropdown menu.
Choose the term of your current mortgage (15, 20, or 30 years).
Enter your desired refinance interest rate.
Select the refinance term (15 years in this calculator).
Click "Calculate" to see your estimated monthly payment and total interest paid.

The calculator will display your estimated monthly payment, total interest paid over the loan term, and a comparison chart showing how your payment changes with different interest rates.

Formula Used

The calculator uses the standard mortgage payment formula:

Monthly Payment = P × [r(1 + r)^n] / [(1 + r)^n - 1]

Where:

P = Principal loan amount
r = Monthly interest rate (annual rate divided by 12)
n = Number of payments (loan term in years × 12)

Total interest paid is calculated by subtracting the original loan amount from the total amount paid over the life of the loan.

Worked Example

Let's calculate a refinance scenario where:

Current loan amount: $200,000
Current interest rate: 6.5%
Current term: 30 years
Refinance interest rate: 4.5%
Refinance term: 15 years

Using the formula:

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

Monthly Payment ≈ $1,345.50

Total Interest Paid = ($1,345.50 × 180) - $200,000 ≈ $12,190

This example shows a potential savings of approximately $12,190 in interest over the 15-year term compared to the original 30-year mortgage.

Types of Refinancing

There are several types of mortgage refinancing options:

Type	Description	Best For
Rate-and-Term Refinance	Switch to a lower interest rate and shorter term	Homeowners looking to reduce monthly payments
Cash-Out Refinance	Take out additional cash while refinancing	Homeowners needing funds for home improvements or other expenses
Interest-Only Refinance	Pay only interest for a period, then switch to principal payments	Homeowners with good cash flow who want lower monthly payments
Streamline Refinance	FHA or VA loan refinancing with no appraisal required	Homeowners with FHA or VA loans looking to lower rates

This calculator focuses on rate-and-term refinancing to a 15-year term, which is particularly beneficial for homeowners looking to pay off their mortgage faster and save on interest.

Frequently Asked Questions

How does refinancing to a 15-year mortgage work?

Refinancing to a 15-year mortgage involves replacing your current mortgage with a new loan that has a shorter term and potentially a lower interest rate. This can result in lower monthly payments and paying off your mortgage faster, though you'll pay more in total interest over the life of the loan.

What are the benefits of a 15-year mortgage?

The main benefits include lower monthly payments, faster mortgage payoff, and potential tax benefits. However, you'll pay more in total interest compared to a longer-term mortgage.

What factors affect the interest rate on a refinance?

Several factors influence refinance rates, including your credit score, loan-to-value ratio, property type, and current market rates. Lenders also consider your debt-to-income ratio and employment history.

Is refinancing always a good idea?

Not necessarily. You should compare the costs and benefits carefully. Refinancing may not be beneficial if you plan to sell your home soon, if the savings don't outweigh the closing costs, or if you can't secure a better rate.

What are the closing costs for refinancing?

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