Finance category
Mortgage, loan, investing, tax, and money calculators.
Mortgage Interest Savings Calculator
Estimate how much mortgage interest you could save with extra monthly payments using a free calculator.
Required payment
$2,587
New payoff time
21 years, 8 months
Interest saved
$121,325
What this estimate means
Adding $300 per month saves about 6 years, 4 months.
This comparison assumes your rate stays fixed for the rest of the mortgage.
How to Use
- Enter your remaining mortgage balance, interest rate, and years left.
- Add the extra amount you want to pay each month toward principal.
- Review the updated payoff timeline.
- Compare the estimated interest savings against the standard payoff path.
Frequently Asked Questions
What does a mortgage interest savings calculator show?
It shows how extra monthly principal payments may shorten your mortgage and reduce total interest over the remaining term.
Is this the same as refinancing?
No. Extra payments keep the same loan and rate, while refinancing replaces the mortgage with a new loan.
Why can even small extra payments matter?
Mortgage balances are large and spread over many years, so even moderate recurring extra payments can trim a meaningful amount of future interest.
Does this assume a fixed rate?
Yes. It assumes the current interest rate stays the same for the rest of the mortgage.
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