Real Estate Calculator Extra Payments
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Reviewed by Calculator Editorial Team
Making extra payments on your mortgage can significantly reduce your payoff time and save you money on interest. This calculator helps you determine exactly how much you'll save by making additional payments, whether monthly or one-time.
How the Calculator Works
The calculator uses the standard mortgage amortization formula to determine how your extra payments affect your loan payoff. Here's how it works:
Mortgage Amortization Formula
The monthly payment (P) is calculated as:
P = L × [r(1 + r)^n] / [(1 + r)^n - 1]
Where:
- L = Loan amount
- r = Monthly interest rate (annual rate ÷ 12)
- n = Number of payments (loan term in years × 12)
When you make extra payments, the calculator recalculates the remaining balance after each payment and adjusts the remaining term accordingly. This shows you the exact savings from interest and the reduced payoff time.
Key Assumptions
- Interest is compounded monthly
- No prepayment penalties
- All extra payments are applied to principal first
- Loan term remains fixed unless specified otherwise
How to Use This Calculator
- Enter your current mortgage balance in the "Loan Amount" field
- Input your current interest rate (APR)
- Specify your current loan term in years
- Enter the amount of your regular monthly payment
- Choose whether you want to make monthly extra payments or a one-time lump sum
- Enter the amount of your extra payment(s)
- Click "Calculate" to see your results
The calculator will show you:
- Total interest saved
- Reduced payoff time
- A chart showing your loan balance over time with and without extra payments
Example Calculation
Let's look at an example to see how extra payments can save you money.
| Scenario | Loan Amount | Interest Rate | Term | Monthly Payment | Extra Payment | Total Interest Paid | Payoff Time |
|---|---|---|---|---|---|---|---|
| Standard Payment | $200,000 | 4.5% | 30 years | $1,143.55 | $0 | $143,553 | 30 years |
| With Extra Payments | $200,000 | 4.5% | 30 years | $1,143.55 | $500/month | $93,553 | 25 years, 6 months |
In this example, making just $500 extra each month reduces the total interest paid by $50,000 and shortens the payoff time by 4.5 years.
Frequently Asked Questions
How much can I save by making extra mortgage payments?
The savings depend on your loan amount, interest rate, and how much you pay extra. Generally, the higher your interest rate and the larger your extra payments, the more you'll save. Our calculator shows you the exact savings for your specific situation.
Is it better to make monthly extra payments or a one-time lump sum?
Monthly extra payments are generally more effective because they compound over time. However, a one-time lump sum can be beneficial if you have a large sum available and want to pay off the loan quickly. Our calculator lets you compare both options.
Will making extra payments change my monthly payment?
No, your regular monthly payment remains the same. The extra payments are applied to the principal balance, which reduces the total interest paid and shortens the payoff time.
Are there any risks to making extra payments?
The main risk is that you might be locked into a longer-term mortgage if you refinance. However, if you're committed to paying off the loan quickly, the savings can be significant. Always consider your financial situation before making extra payments.