The full PITI
Banks quote P&I. Lenders underwrite to PITI. The taxes, insurance, PMI and HOA are part of your real housing cost — and they push the monthly number significantly higher than the loan figure alone.
Loan details
$
$
10% down
%
PITI extras (monthly)
U.S. averages pre-filled. Edit any field to match your situation, or zero out for P&I-only view.
$
$
$
$
Extra principal payment
What this home will actually cost
$735,510
$2,043/mo total payment · $420,510 in interest over 30 years · on a $350,000 home
Of every dollar of your first principal & interest payment, —¢ goes to the bank in interest. Only —¢ pays down what you actually owe. That ratio improves as the balance shrinks — the early years are the most expensive.
Principal + interest
$2,043/mo
Total monthly (PITI)
$2,043/mo
Lifetime interest
$420,510
Payoff date
—
Where the monthly payment goes
What that extra does
Time saved
—
Interest saved
—
Quiet math. Same scheduled payment. The extra goes straight to principal — and the loan ends earlier because of it.
Year-by-year amortization
Same payment every year — but the split shifts. Less goes to the bank, more goes to you. By the end, almost everything you pay is yours.
What this calculator answers
The four numbers a mortgage shopper needs.
The lifetime number
Total interest from now until the loan is paid off. On a 30-year loan, this is often more than the home itself. Knowing the number changes how a small rate difference feels.
What one extra payment does
The slider applies extra to principal only — it doesn't reduce your scheduled payment. The savings come from the loan ending sooner. The math is real and the numbers add up faster than most people expect.
Common questions
A few things people ask about mortgages.
What is PITI?
PITI is the full monthly housing payment: Principal, Interest, Taxes, and Insurance. Lenders use PITI when underwriting a loan because it represents your real monthly housing cost — not just the loan payment.
Do extra payments change my monthly payment?
No. Extra payments go to principal only. Your scheduled monthly payment stays the same. The benefit is that the extra principal shortens the life of the loan, which shrinks the lifetime interest.
How much does one extra payment a year save?
On a typical $300k–$500k mortgage at current rates, one extra principal payment a year (about a month's payment, applied as principal) shaves roughly four to six years off a 30-year loan and saves tens of thousands in lifetime interest. Move the slider above to see the exact number for your loan.
Does this calculator save my data?
No. Every calculation runs in your browser. Nothing is sent to a server. Nothing is stored — refresh the page and the inputs reset.
Want this for every debt, not just one?
Actually. tracks every debt you carry — mortgage, cards, auto, subscriptions — all in one place. Same math you saw above, applied to every debt. Numbers live in your own Google Drive — durable storage you control. Free forever.
More calculators
Other free tools.
Debt Payoff
Add every debt, pick a payoff order, see your debt-free date.
OpenCredit Cards
Lifetime interest at minimums versus paying more.
OpenDebt-to-Income
Front-end and back-end DTI, plus the bands lenders use.
OpenTrack every debt together
The full app. Every debt, every dollar, on your device.
App in Beta coming soon