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Archived noindex page. Kefiw's public focus is Property decision help.

Archived page

This older Kefiw page is kept for reference, marked noindex, and removed from the primary sitemap. The current Kefiw experience is focused on property decisions: cost, quotes, damage, buying, selling, owning, and packets.

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Mortgage Extra Payment Calculator

Find how faster payoff changes your timeline and total interest.

Enter your loan, rate, term, and any extra payment you plan to make. Get months saved, interest saved, and side-by-side scenarios — no log-in, no tracking.

Part of: Saving & Spending Calculators

Enter the numbers you know below
Fields marked optional can be skipped; results update as you type
Months saved
6y 7m
Interest saved
$105,428.67
You save 6y 7m and $105,428.67 in interest — paying off in 23y 5m.
Months saved
6y 7m
Interest saved
$105,428.67
New payoff
23y 5m
New total paid
$622,713.69
Payoff reduction
21.9%
Interest reduction
25.8%
Baseline interest
$408,142.36
New interest
$302,713.69
Your current extra payment saves about $105,428.67 in interest and cuts about 6y 7m off the loan.
An extra $100/month would pay this off about 3y 10m sooner and save about $61,698.47 in interest.
Extra payment scenarios
No extra
  • Payoff: 30y
  • Interest: $408,142.36
  • Saved: $0.00
+$100/mo
  • Payoff: 26y 2m
  • Interest: $346,443.89
  • Saved: $61,698.47
+$250/mo
  • Payoff: 22y 3m
  • Interest: $285,148.38
  • Saved: $122,993.99
+$500/mo
  • Payoff: 18y
  • Interest: $222,589.92
  • Saved: $185,552.45
Mortgage Calculator →Break-even Calculator →Percentage Calculator →

How to use

  1. Enter your loan amount, interest rate, and original term.
  2. Enter an extra monthly amount (or leave $0 to see the baseline).
  3. Optional: add a one-time or annual extra payment in advanced options.

Examples

+$200/month on a $320,000 / 6.5% / 30yr loan
Pays off about 6 years sooner and saves roughly $128,000 in interest.
+$100/month
Roughly 3½ years sooner, saving about $75,000 in interest on the same loan.

Before you trust the result

Check the inputs that matter most: dates, rates, units, costs, and any optional fields you skipped. A calculator can only work with the numbers entered here, so use the result as a decision check rather than a final answer when money, health, tax, legal, or safety consequences are involved.

If the result feels surprising, change one input at a time and watch which number moves. That usually shows the real lever behind the decision.

Next up

Curious about the base payment? Start from the standard calc.Mortgage Calculator → Extra cash flowing? Direct it to a savings target instead.Savings Goal Calculator →

Frequently asked questions

› Why do extra payments save so much interest? Troubleshooting

Extra principal reduces the balance that interest is charged on every month thereafter. The earlier the extra payment, the larger its compounding effect.

› Do small extra payments matter?

Yes. An extra $50/month on a 30-year loan at 6–7% typically shortens payoff by roughly 2 years.

› Monthly extra vs annual lump sum — which wins? Comparison

A fixed total spread monthly usually saves slightly more than the same total paid once a year, because the principal drops earlier.

Tips & related reading

See the Saving & Spending Calculators hub →

Tips & how-tos

Relevant links

Related tools

Mortgage Calculator

Calculate your monthly mortgage payment with taxes, insurance, HOA, and PMI. See total interest and what each 1% rate change really costs.

Break-Even Calculator

Calculate how many units you must sell to cover fixed costs — break-even quantity and revenue.

Percentage Calculator

Calculate percentages: what is X% of Y, X is what % of Y, and % change.