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Mortgage Prepayment Calculator

See how extra monthly payments shrink your loan timeline and reduce total interest paid over the life of your mortgage.

Quick answer: Mortgage prepayment saves interest by reducing principal early. The value depends on your mortgage rate, remaining term, extra payment size, and whether cash has better alternative uses.

SWReviewed by SwitchWize Research Desk · Last reviewed July 17, 2026
Years Saved Off Mortgage
0.0 years
Years Saved Off Mortgage
0.0 years
Current Monthly Payment (P&I)
$2,583
Total Interest Without Prepayment
$467,857
New Monthly Payment (P&I + extra)
$2,583
Payment composition
$2,583monthly payment
Current Monthly Payment (P&I)$2,583
Total$2,583
Months Saved
0 months
Estimated Interest Saved
$0
Diagnostic

Over the life of this loan, you pay $467,857 in interest.

That's the cost of borrowing on top of what you actually got.

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What to do next

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Your action plan
  1. 1

    Set the target and timeline for this plan

    Estimate extra-principal payoff effects while disclosing the remaining final-partial-payment approximation.

  2. 2

    Pressure-test one alternate scenario before deciding

    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

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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 Mortgage Prepayment Calculator calculation look like?
Using this calculator's own default assumptions, a current loan balance of $400,000, interest rate of 6.72% and years remaining of 28 produces an estimated years saved off mortgage of 0.0 years and current monthly payment (p&i) of $2,645. Enter your own numbers above to see how it changes for your situation.
Does prepayment always make sense financially?
Prepayment reduces the total interest you pay and frees you from the loan sooner, but it ties up cash that could go toward other goals like emergency savings, investing, or debt with higher interest rates. The math of interest saved is straightforward, but whether it's the right choice depends on your other financial needs.
How does a larger extra payment change the outcome?
A bigger extra payment each month shortens your payoff timeline more sharply and saves more interest overall, because you're reducing the balance that accrues interest faster. The relationship is nonlinear: doubling your extra payment doesn't exactly halve the time, because interest calculations shift as the balance drops.
Is the Mortgage Prepayment 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 Mortgage Prepayment 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

Making extra principal payments accelerates equity buildup and cuts the total interest you'll pay, but the tradeoff is less monthly cash flow now. Understanding exactly how much time and interest you save helps you decide whether prepayment fits your financial priorities, whether that's debt freedom or liquidity.

How to Use It

  1. 1Enter your current loan balance.
  2. 2Enter your interest rate as shown on your loan documents.
  3. 3Enter how many years remain on your mortgage.
  4. 4Enter the extra amount you plan to pay toward principal each month.
  5. 5Review how your new monthly payment compares, how many months and years you'll save, and your total interest reduction.
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