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Extra Mortgage Payment Calculator

See how much time and interest you'll save by making extra monthly principal payments toward your mortgage.

Quick answer: Estimate payoff time and interest savings from extra principal using the current average mortgage rate as an editable starting assumption. Enter Current Loan Balance, Interest Rate, Remaining Loan Term (Years), and Extra Payment Per Month to personalize the estimate. It returns New Total Monthly Payment, Current Monthly Payment, and New Payoff Time so you can compare the impact before choosing a next step. Use it to compare payment, equity, rate, and timing tradeoffs before applying or changing a loan.

SWReviewed by SwitchWize Research Desk · Last reviewed July 20, 2026
New Total Monthly Payment
$2,431
New Total Monthly Payment
$2,431
Current Monthly Payment
$2,231
New Payoff Time
23.8 years
Years Saved
6.2 years
Total Interest Saved
$110,272
Diagnostic

Adding $200 a month pays off your loan about 6.25 years early.

That saves roughly $110,272 in total interest over the life of the loan.

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What to do next

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Your action plan
  1. 1

    Calculate the baseline result with your current numbers

    Estimate payoff time and interest savings from extra principal using the current average mortgage rate as an editable starting assumption.

  2. 2

    Compare the result against current market-rate options

    Assumptions change the answer, especially when rates, taxes, or timing matter.

  3. 3

    Save the result to Money Map or use the linked next action

    Turn the result into a prioritized action instead of treating it as a one-off number.

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This is an educational estimate, not tax, legal, investment, or lending advice. Tax rules, rates, and eligibility change and depend on your full situation. Confirm with a qualified professional or the provider before acting.

Calculator action path

Turn this result into a decision

Every SwitchWize calculator connects to a product comparison, rate context, guidance, alerts, and Money Map.

Rate authority hub
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You could gain ~$2,431/yr. Compare nowMove from calculation to current product options.
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Guide
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Money Map
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Alert
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About mortgage rates

Mortgage rates depend on loan type (30-yr fixed, 15-yr fixed, ARM, FHA, VA, jumbo), your credit score, down payment, points paid, loan amount, property state, and whether you're purchasing or refinancing. The calculator above uses a representative market rate for payment estimates, your actual rate will vary.

For a personalized rate comparison, use the tool below to see lenders ranked by APR, loan type, and your profile.

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30-yr fixed · 15-yr fixed · FHA · VA · ARM: ranked by APR
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Mortgage rates shown on SwitchWize compare pages include loan type, assumed FICO, LTV, and points. Representative only. Verify all terms directly with the lender. Advertising disclosure

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Frequently Asked Questions

Everything you need to know.

What does an example Extra Mortgage Payment Calculator calculation look like?
Using this calculator's own default assumptions, a current loan balance of $350,000, interest rate of 6.5% and remaining loan term (years) of 30 produces an estimated new total monthly payment of $2,412 and current monthly payment of $2,212. Enter your own numbers above to see how it changes for your situation.
How does making extra principal payments actually reduce the total interest I pay?
Interest accrues on your outstanding balance each month. When you pay extra principal, you lower that balance faster, so future interest calculations are applied to a smaller amount. This compounds over time, meaning early extra payments save significantly more interest than the same payments made later in the loan.
What's the trade-off between paying extra on my mortgage versus investing that money elsewhere?
Extra mortgage payments guarantee a return equal to your interest rate by reducing the interest you owe. Money invested elsewhere carries different risk and return potential. The right choice depends on your expected returns elsewhere, your comfort with debt, and your financial priorities. This calculator shows the mortgage payoff side of that equation.
Is the Extra Mortgage Payment Calculator free to use?
Yes. SwitchWize calculators are free, and you do not need an account to run scenarios or view the result.
Does using the Extra Mortgage Payment Calculator affect my credit score?
No. Using a calculator does not trigger a credit check. A credit impact can occur only if you apply directly with a lender, card issuer, or provider.
Are the results personalized financial advice?
No. Calculator outputs are educational estimates based on the inputs you enter. Review assumptions and confirm terms directly with providers before making a financial decision.
What should I do after seeing the result?
Use the recommendation module on this page to compare mortgage lenders, or run Money Map to compare this home & mortgage decision with your other opportunities.
How does SwitchWize choose related offers?
Related offers are matched by the calculator surface (mortgage) and ranked using SwitchWize data such as rate, fees, trust signals, product fit, and switching friction. Paid relationships do not change organic ranking order.
How fresh are the rates and offers shown?
Rate and offer data is reviewed on a recurring cadence and every offer module shows review context or links to the methodology and disclosure pages.
Where can I see the ranking methodology?
The SwitchWize methodology page explains how rate freshness, editorial review, affiliate disclosure, and category ranking factors work.
Can Money Map use this result?
Yes. Money Map is the broader diagnostic path: it compares savings, mortgage, cards, and debt so you can see whether this calculator result is your highest-impact next move.

Why This Matters

Extra principal payments reduce the amount of interest you pay over the life of your loan because interest is calculated on your remaining balance. Even small additional payments compound over time, shortening your payoff timeline significantly. Understanding this trade-off helps you decide whether accelerating your mortgage payoff aligns with your broader financial goals.

How to Use It

  1. 1Enter your current outstanding loan balance.
  2. 2Input your interest rate (you can adjust the default current average rate).
  3. 3Specify how many years remain on your original loan term.
  4. 4Enter the extra amount you plan to pay toward principal each month.
  5. 5Review your current and new monthly payments, how many years sooner you'll be paid off, years saved, and total interest savings.
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