15 Yr Loan Calculator with Extra Payment
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Reviewed by Calculator Editorial Team
This 15-year loan calculator with extra payment feature helps you determine how making additional payments affects your loan term and total interest paid. Whether you're refinancing, paying off debt faster, or planning your budget, this tool provides clear insights into the financial benefits of extra payments.
How to Use This Calculator
Using this calculator is simple. Follow these steps:
- Enter the loan amount you're considering.
- Input the annual interest rate.
- Specify the loan term in years (15 years in this case).
- Enter the amount of your regular monthly payment.
- Input the amount of your extra monthly payment.
- Click "Calculate" to see the results.
The calculator will show you how much you'll save in interest and how much sooner you'll pay off your loan with the extra payments.
How the Calculator Works
The calculator uses standard loan amortization formulas to determine the impact of extra payments. Here's how it works:
Loan Amortization Formula
The monthly payment (P) is calculated using the formula:
P = (A × r × (1 + r)^n) / ((1 + r)^n - 1)
Where:
- A = Loan amount
- r = Monthly interest rate (annual rate ÷ 12)
- n = Total number of payments (loan term in years × 12)
When you add extra payments, the calculator recalculates the remaining balance each month and adjusts the remaining term accordingly.
Example Calculation
Let's look at an example to understand how extra payments work:
| Scenario | Loan Amount | Interest Rate | Term | Regular Payment | Extra Payment | Total Interest Paid | Loan Paid Off In |
|---|---|---|---|---|---|---|---|
| Standard Payment | $100,000 | 5% | 15 years | $837.76 | $0 | $116,215.20 | 15 years |
| With Extra Payment | $100,000 | 5% | 15 years | $837.76 | $200 | $82,946.40 | 12 years, 6 months |
In this example, making an extra $200 per month reduces the total interest paid by over $33,000 and pays off the loan in about 12.5 years instead of 15.
Frequently Asked Questions
How do extra payments affect my loan term?
Extra payments reduce your loan balance faster, which means you'll pay off your loan sooner. The calculator shows you exactly how much time you'll save.
Will extra payments save me money on interest?
Yes, extra payments will reduce the total interest you pay over the life of the loan. The calculator shows you the exact savings.
Can I make extra payments at any time?
The calculator assumes you make the same extra payment each month. If you make irregular extra payments, the results may vary.
Is it better to make extra payments or refinance?
Extra payments are a good option if you want to keep your current loan terms. Refinancing may offer better rates but could have different terms.