HomeExpertly
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Interest Savings Calculator (USA)

See exactly how much interest you'd save with extra monthly payments, a lump sum, biweekly payments, an annual bonus payment, or a lower rate — plus how many years earlier your loan would be paid off.

For estimation purposes only. Confirm prepayment rules and penalties with your loan servicer before you start.
1 Your current loan
%
2%8%15%
yrs
Your baseline: no extra payments, current rate, full remaining term.
2 Payoff strategy
3 Rate & term change
%
2%8%15%
yrs
Total interest saved
—
Enter your details and click Calculate
Savings highlights
Interest saved —
Time saved —
New payoff —
Interest without plan —
Interest with plan —
New monthly outlay —
Interest comparison
Calculate to see comparison
Baseline — no changes
Loan balance—
Interest rate—
Monthly P&I—
Payoff time—
Total interest—
Total paid—
Your payoff plan
Starting balance—
Interest rate—
Base monthly P&I—
Extra principal /mo—
Biweekly equivalent /mo—
Annual extra payment—
Total monthly outlay—
Payoff time—
Total interest—
Total paid—
Savings analysis
Interest saved—
Costs to switch—
Net savings—
Interest reduced by—
Time saved—
Payments avoided—
Extra paid over life—
Return on extra dollars—
Debt-free date—
Visualizations
Balance: baseline vs. your plan
Where the interest goes
Disclosure: This calculator provides estimates for informational purposes only and does not constitute financial advice. Results assume every extra dollar is applied to principal immediately and that no prepayment penalty applies. Confirm prepayment handling, escrow changes, and refinance costs with your servicer or a licensed lender.