Turn 30 Year Mortgage Into 15 Calculator
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Reviewed by Calculator Editorial Team
Use this mortgage refinance calculator to determine if turning a 30-year mortgage into a 15-year mortgage saves you money. Compare interest rates, payments, and savings with our easy-to-use tool.
How It Works
Refinancing your mortgage from a 30-year term to a 15-year term can significantly reduce your monthly payments and pay off your loan faster. However, it typically comes with higher interest rates. This calculator helps you determine whether the savings outweigh the increased interest costs.
Key Considerations
- Original mortgage amount and interest rate
- New mortgage interest rate
- Current loan balance
- Additional closing costs
Note: Refinancing may not always be the best financial decision. Consider your current interest rate, credit score, and long-term financial goals before proceeding.
Key Formulas
The calculator uses these standard mortgage formulas:
Monthly 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 / 12)
- n = number of payments (term in years × 12)
Total Interest Paid
Total Interest = (Monthly Payment × Number of Payments) - Principal
Net Savings
Net Savings = (Original Total Interest - New Total Interest) - Closing Costs
Example Calculation
Let's look at an example to see how the calculator works:
Scenario
- Original mortgage: $200,000 at 4.5% for 30 years
- Current balance: $150,000 after 5 years
- New mortgage rate: 4.0%
- Closing costs: $3,000
Results
Original monthly payment: $879.36
Original total interest: $122,222
New monthly payment: $1,100.00
New total interest: $50,000
Net savings: $69,222
In this example, refinancing saves $69,222 over the life of the loan, even with closing costs.
Comparison Table
Here's a comparison of a 30-year vs. 15-year mortgage for a $200,000 loan at different interest rates:
| Interest Rate | 30-Year Payment | 30-Year Total Interest | 15-Year Payment | 15-Year Total Interest |
|---|---|---|---|---|
| 4.0% | $879.36 | $122,222 | $1,100.00 | $50,000 |
| 4.5% | $1,000.00 | $150,000 | $1,250.00 | $75,000 |
| 5.0% | $1,125.00 | $187,500 | $1,400.00 | $112,500 |
Frequently Asked Questions
- Is refinancing always a good idea?
- Not necessarily. You should compare the new interest rate with your current rate, factor in closing costs, and consider how long you plan to stay in the home.
- What are the closing costs for refinancing?
- Typical closing costs range from 2% to 5% of the loan amount, including appraisal fees, title insurance, and origination fees.
- Can I refinance if I have bad credit?
- Yes, but you may need to pay higher interest rates or closing costs. Specialized lenders may offer options for borrowers with lower credit scores.
- How does refinancing affect my credit score?
- Refinancing can temporarily lower your credit score as it appears as a hard inquiry. However, it can also help improve your score if you maintain good payment history.
- What if I can't afford the higher monthly payment?
- Consider a shorter-term refinance (like 10 years) or a home equity loan instead. These options may offer lower monthly payments while still reducing your principal faster.