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Mortgage Overpayment Calculator (USA)

See what paying extra does to your mortgage. Add a monthly overpayment, a one-time lump sum, or a yearly bonus payment, and see how much interest you skip, how many years you cut, and when PMI drops off.

For estimation purposes only. Assumes every extra dollar is applied to principal. Check your loan for prepayment terms.
1 Your mortgage
Used to work out when PMI can drop off (78% loan-to-value).
%
2%7%12%
yrs
2 Overpayment plan
$0$1,000$2,000
month
1 = start with your next payment.
#
Applied on each 12-month anniversary.
3 Goals & comparison
yrs
Leave blank to skip. We’ll show the extra payment needed to hit it.
%
Set to 0 to hide the comparison.
Interest you skip
—
Add an overpayment and click Calculate savings
Overpayment highlights
Time saved —
New payoff date —
Interest saved —
Total overpaid —
Saved per $1 overpaid —
New monthly payment —
Your payoff goal
Set a target payoff in years and we’ll show the extra monthly payment that gets you there.
Monthly breakdown
Calculate to see breakdown
Without overpayments
Loan type—
Remaining balance—
Interest rate—
Years remaining—
Monthly P&I—
Monthly PMI / MIP—
Payoff date—
Total interest—
Total monthly (current)—
With overpayments
Monthly P&I—
Extra principal—
Monthly PMI / MIP—
Property tax—
Homeowners insurance—
HOA dues—
One-time lump sum—
Yearly lump sum—
Total monthly (with overpayment)—
Total monthly after PMI ends—
Overpayment analysis
New payoff time—
Time saved—
Interest without overpaying—
Interest with overpaying—
Total overpaid—
PMI removed early—
Total paid (with overpaying)—
Invested instead, could be—
Total interest saved—
Visualizations
Balance: overpaying vs not
Principal vs. interest
Disclosure: This calculator provides estimates for informational purposes only and does not constitute financial advice. Results assume every extra dollar is applied to principal in the month it is paid. Some loans carry prepayment penalties or apply extra funds differently — confirm with your servicer, and consult a licensed professional before making a decision.