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  1. Home
  2. Financial Tools
  3. Mortgage Payoff Calculator

Mortgage Payoff Calculator

See how extra payments can help you pay off your mortgage faster. Compare strategies and calculate interest savings.

By Joseph Orduna·Reviewed April 16, 2026·How this works
Formula:PMT = P × r(1+r)^n / ((1+r)^n - 1)

Payoff Summary

Time Saved

9y 7m

Faster payoff

Interest Saved

$131,411

Original PayoffApr 2056
New PayoffSep 2046
Original Interest$356,968
New Interest$225,557

Current Mortgage

$
50,0001,000,000
%
$

Payoff Strategy

$
502,000

Adding $300 to each monthly payment.

Balance Over Time

Extra Payment Comparison

Extra/MonthTime SavedInterest SavedNew Payoff
$1004y 3m$60,159Jan 2052
$2508y 6m$117,351Oct 2047
$50012y 11m$173,463May 2043
$1,00017y 9m$230,321Jul 2038

Strategy Comparison

Biweekly Payments

5 years, 10 months faster

Save $81,376

$300/month Extra

9 years, 7 months faster

Save $131,411

$3600/year Extra

9 years, 4 months faster

Save $126,901

Quick Tips

Round Up

Round your payment to the nearest $100 for easy extra principal.

Tax Refunds

Apply annual tax refunds as lump sum principal payments.

Specify Principal

Label extra payments as "principal only" to ensure they reduce balance.

Automate

Set up automatic extra payments so you don't forget.

Payoff Summary

Time Saved

9y 7m

Faster payoff

Interest Saved

$131,411

Original PayoffApr 2056
New PayoffSep 2046
Original Interest$356,968
New Interest$225,557

Adjust Extra Monthly Payment

See how increasing extra payments accelerates your payoff and saves interest

$50$300$2,000

Personalized Insights

2 insights based on your inputs

Good News

You'll pay off 9 years earlier and save $131,411 in interest!

Good News

You'll save more than 30% of your current balance in interest - excellent strategy!

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Find out how much house you can afford

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View detailed loan amortization schedules

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Frequently Asked Questions

Make extra principal payments (even $100/month helps). Switch to biweekly payments (makes 13 payments/year). Apply tax refunds or bonuses as lump sums. Round up your payment. Refinance to a shorter term. Avoid resetting the clock when refinancing.

Extra payments, biweekly schedule, lump sums from windfalls, or shorter refinance term.

Consider your mortgage rate vs investment returns, tax benefits (interest deduction), emergency fund status, other debt rates, and retirement savings. Generally, pay off if rate > 5-6% or you want peace of mind. Invest if rate < 4% and you're comfortable with debt.

Depends on rate vs returns, emergency fund, other debt. Pay off if rate >5-6%.

Instead of 12 monthly payments, you make 26 half-payments (every two weeks). This equals 13 full payments per year instead of 12. The extra payment goes to principal, typically saving 4-6 years and tens of thousands in interest on a 30-year mortgage.

26 half-payments = 13 full payments/year. Saves 4-6 years on a 30-year mortgage.

On a $300K mortgage at 7%, $200/month extra saves $95K in interest and pays off 8 years early. Even $50/month saves $25K and 2 years. The earlier you start, the more you save due to compound interest working in reverse.

$200/mo extra on $300K at 7% saves $95K and 8 years. Even $50/mo saves $25K.

Most conventional loans have no prepayment penalty. Some loans (especially older ones or certain private loans) may have penalties for the first 3-5 years. Check your loan documents or contact your servicer. Federal law limits prepayment penalties.

Most loans have no penalty. Check documents - some older loans may have 3-5 year limits.

How this works

Calculations are run entirely in your browser. No inputs are sent to our servers and no account is required. Formulas follow standard US definitions from the IRS and the CFPB where applicable; international users should confirm local tax and regulatory rules apply.

What this tool can’t do

When to consult a professional

This is a software engineering tool, not financial advice. Run the math here, then take the result to a certified financial planner, CPA, or your bank before making a decision that materially affects your money.

Sources

  1. [1]
    Consumer Financial Protection Bureau (CFPB)
    Official source·consumerfinance.gov·Accessed Apr 21, 2026

    US consumer finance regulator; authoritative on mortgage disclosures, APR rules, credit cards.

Not financial advice

This tool is an educational calculator built by a software engineer, not a licensed financial advisor. Results are informational only. Before making financial decisions, consult a certified financial planner, CPA, or your bank.

Consumer Financial Protection Bureau →

Joseph Orduna
Joseph OrdunaFounder & Software Engineer

Full-stack software engineer specializing in embedded systems, web architecture, and AI/ML. Founder of Practical Web Tools. Built the gesture-controlled drone IP acquired by KD Interactive (Aura Drone, sold on Amazon).

Full bioLinkedIn

Payoff Summary

Time Saved

9y 7m

Faster payoff

Interest Saved

$131,411

Original PayoffApr 2056
New PayoffSep 2046
Original Interest$356,968
New Interest$225,557