Mortgage Calculator

Calculate your monthly mortgage payment, total interest, and a detailed amortization schedule. Includes start date, extra monthly payments, one-time prepayment, and charts — all in one page.

Tip: type in any field — results update instantly.

Inputs

Principal + Interest
$
$
Down payment: 20% of home price
%
yrs
$
$
This calculator estimates principal & interest only. If you want a full “PITI” (taxes/insurance/HOA/PMI), tell me and I’ll extend this page with escrow fields.

Results

Auto-updating
Monthly payment (P&I)
$0
Based on loan amount and rate
Total interest
$0
Over the full payoff timeline
Payoff time
—
With extra payments (if any)
Total paid
$0
Principal + interest

Payment breakdown (first month)

Principal
$0
Interest
$0

Balance over time

Loan amount
$0
Interest saved
$0
Period Payment Principal Interest Extra Balance
Rate: —% Term: — yrs Extra: $0/mo
Scroll table • Sticky headers • Copy-friendly

How this mortgage calculator works

This page estimates your principal & interest mortgage payment and generates an amortization schedule. It also shows how extra payments can shorten payoff time and reduce total interest.

Mortgage payment formula (fixed-rate, principal & interest):
Payment = L × (r × (1 + r)^n) / ((1 + r)^n − 1) where L = loan amount, r = monthly rate, n = number of payments.

What is included (and what is not)

Want a full PITI breakdown like big mortgage sites? Tell me and I’ll add escrow fields + PMI estimate and show total monthly payment.

Extra payments: why they matter

Extra principal payments reduce the balance faster, which lowers interest in later months. Even small extra payments can meaningfully cut total interest over a 30-year loan.