FREE INTERACTIVE CALCULATOR
Estimate how extra payments shorten a remaining mortgage term and reduce future interest.
Interest saved: $21,756.41 · Payoff 37 months sooner · Future interest: $88,048.77
| Month | Payment | Principal | Interest | Balance |
|---|---|---|---|---|
| 1 | $1,700.00 | $783.33 | $916.67 | $199,216.67 |
| 2 | $1,700.00 | $786.92 | $913.08 | $198,429.74 |
| 3 | $1,700.00 | $790.53 | $909.47 | $197,639.21 |
| 4 | $1,700.00 | $794.15 | $905.85 | $196,845.06 |
| 5 | $1,700.00 | $797.79 | $902.21 | $196,047.27 |
| 6 | $1,700.00 | $801.45 | $898.55 | $195,245.82 |
| 7 | $1,700.00 | $805.12 | $894.88 | $194,440.69 |
| 8 | $1,700.00 | $808.81 | $891.19 | $193,631.88 |
| 9 | $1,700.00 | $812.52 | $887.48 | $192,819.36 |
| 10 | $1,700.00 | $816.24 | $883.76 | $192,003.11 |
| 11 | $1,700.00 | $819.99 | $880.01 | $191,183.13 |
| 12 | $1,700.00 | $823.74 | $876.26 | $190,359.38 |
Monthly schedule calculated with unrounded internal amounts; display and CSV values are rounded to cents.
Compare the amortization of your current outstanding balance at the entered scheduled payment with the same payment plus extra principal.
The results update in your browser as you change the inputs. You can test alternatives without creating an account.
If you owe $200,000 and make additional principal payments, the balance declines sooner and future interest costs generally fall.
The default values in the tool are illustrative. Change them to match your situation.
Use your lender statement for the remaining balance, monthly principal-and-interest payment and applicable interest rate. Prepayment terms vary.
Results are educational estimates, not professional financial advice or a lender quote.
Compare the amortization of your current outstanding balance at the entered scheduled payment with the same payment plus extra principal.
If you owe $200,000 and make additional principal payments, the balance declines sooner and future interest costs generally fall.
Use your lender statement for the remaining balance, monthly principal-and-interest payment and applicable interest rate. Prepayment terms vary.
Browse the calculator library · Mortgage Calculator · Calculation methodology
Content created October 23, 2026. Methods and editorial standards.
