Mortgage Calculator

Total monthly housing cost from the home price, down payment, rate, term and start date — taxes, insurance, HOA and PMI shown separately. Compare two scenarios side by side, test extra payments (monthly, yearly, one-time or biweekly) and open a full amortization schedule you can download as CSV.

Example values are shown — change any of them and the answer updates live.

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years

The first payment is due one month after this date.

Compare two scenarios

Scenario A is your current input. Adjust scenario B — the differences update instantly.

Quick comparisons:

Scenario A

$2,318.56/ month

$370,683 Total interest · Sep 2056

$80,000 Upfront cash (down payment)

Scenario B

$3,100.34/ month

$166,062 Total interest · Sep 2041

$80,000 Upfront cash (down payment)

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%
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Scenario AScenario BChange
Monthly payment$2,318.56$3,100.34+$781.78
Total interest$370,683$166,062−$204,622
Total to the lender$690,683$486,062$204,622
Payoff dateSep 2056Sep 2041−15 years
Upfront cash (down payment)$80,000$80,000+$0

Scenario B costs $781.78 more per month but saves $204,622 in interest and pays off 15 years earlier. That's the trade-off — neither is objectively better; choose what fits your budget.

Extra payment lab

See exactly what extra money does: less interest, earlier payoff.

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paid with month 24

Original plan

PayoffSep 2056
Total interest$370,683

With extras

PayoffSep 2056
Total interest$370,683

Loan balance over time

$0$80,000$160,000$240,000$320,000Year 0Year 5Year 10Year 15Year 20Year 25Year 30
Original plan

Original plan: $320,000 → 0 · Sep 2056.

Principal vs interest, year by year

$0$11,512$23,024Year 1Year 6Year 11Year 16Year 21Year 26
Principal paidInterest paid

Amortization schedule: Principal and interest only — taxes, insurance and PMI are billed separately.

What the numbers tell you

  • Interest is 53.7% of everything you pay to the lender.
  • Non-loan costs (tax, insurance, PMI, HOA, other) add $400 per month on top of the loan payment.
  • At the same rate, a 15-year loan would cost 55% less in interest — but $781.78 more per month.

Amortization schedule

Principal and interest only — taxes, insurance and PMI are billed separately.

YearPrincipalInterestBalance
Year 1$3,930$19,093$316,070
Year 2$4,172$18,851$311,898
Year 3$4,429$18,593$307,469
Year 4$4,702$18,320$302,767
Year 5$4,993$18,030$297,774
Year 6$5,300$17,722$292,474
Year 7$5,627$17,395$286,846
Year 8$5,974$17,048$280,872
Year 9$6,343$16,680$274,529
Year 10$6,734$16,289$267,795

How it works

Step 1 · Monthly interest rate
r = APR ÷ 12
6 ÷ 12 = 0.5%
0.005
Step 2 · Monthly payment
P = L·r(1+r)ⁿ ÷ ((1+r)ⁿ − 1)
$320,000 × … = $1,918.56
$1,918.56 / month
Step 3 · Real monthly cost
Total = P&I + tax÷12 + ins÷12 + HOA + PMI + other
$1,918.56 + $300 + $100 …
$2,318.56 / month
Step 4 · Extra payments
balance = balance − extra, every payment
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Estimates under the stated assumptions, for illustration — not financial advice.