Extra Mortgage Payment Calculator
Estimate interest savings and payoff reduction from extra monthly, yearly, or one-time payments.
This page is an editable estimator with realistic defaults so you can model your own situation in minutes.
Compares standard amortization against a schedule with added principal payments.
Treat the result as a planning estimate and verify important numbers with the relevant official source before acting.
| Standard total interest | $467,233.60 |
|---|
| Month | Balance | Interest paid |
|---|---|---|
| 12 | $336,827.17 | $23,068.29 |
| 24 | $328,085.28 | $45,567.52 |
| 36 | $318,734.71 | $67,458.07 |
| 48 | $308,733.08 | $88,697.56 |
| 60 | $298,035.05 | $109,240.65 |
| 72 | $286,592.15 | $129,038.87 |
| 84 | $274,352.50 | $148,040.34 |
| 96 | $261,260.62 | $166,189.58 |
| 108 | $247,257.19 | $183,427.27 |
| 120 | $232,278.73 | $199,689.93 |
| 132 | $216,257.34 | $214,909.66 |
| 144 | $199,120.43 | $229,013.87 |
Assumptions
- Extra payments are treated as principal reductions.
How this calculator works
Formula used
Compares standard amortization against a schedule with added principal payments.
Example calculation
Plug in your own numbers and the result updates instantly. Compares standard amortization against a schedule with added principal payments.
Extra Mortgage Payment Calculator FAQ
Is this extra mortgage payment calculator exact?
No. It is a U.S.-focused estimate for planning. Actual mortgage quotes, taxes, insurance, fees, HOA dues, lender rules, and local real estate costs can vary.
What numbers should I enter?
Use current lender quotes, county tax estimates, insurance quotes, HOA dues, and realistic purchase or rent assumptions whenever possible.
Is this mortgage or real estate advice?
No. The result is educational only and is not financial, mortgage, tax, legal, or real estate advice.