Mortgage Calculator
Run your numbers before anyone asks you to decide.
Monthly payment, what a rate change would cost you, and what breaking your mortgage early might actually cost.
Estimated monthly payment
$3,684.64
Mortgage amount
$680,000
Down payment
$170,000
Default insurance
—
If your rate changes
What the same mortgage costs each month at a different rate.
-1.00% → 3.29%
$3,320.10
−$364.54 / month
-0.50% → 3.79%
$3,499.95
−$184.69 / month
-0.25% → 4.04%
$3,591.70
−$92.94 / month
+0.25% → 4.54%
$3,778.75
+$94.11 / month
+0.50% → 4.79%
$3,874.02
+$189.38 / month
+1.00% → 5.29%
$4,067.92
+$383.28 / month
Estimated break penalty
Breaking a fixed mortgage early usually costs the greater of three months' interest or the interest rate differential (IRD).
- Estimated balance at break$648,118
- Three months' interest$6,951.06
- Interest rate differential$9,721.77
- Likely penalty$9,721.77
Estimates only. Lender penalty formulas, posted-rate discounts, and insurance rules vary — your actual numbers should be confirmed on your specific mortgage.