Amortization Schedule Calculator
Monthly P&I, extra principal, total interest, and a 12-row schedule. Click any i for detail.
Loan
Principal ($)
i
Principal
Amount financed. |
|
|---|---|
APR (%)
i
APR
Annual interest rate. |
|
Term (months)
i
Term
360 = 30 years, 180 = 15 years. |
|
Extra principal / mo ($)
i
Extra
Optional extra toward principal each month. |
First 12 payments
Principal vs interest split for the opening year.
| # | Payment | Principal | Interest | Balance |
|---|
How to use this calculator
- Enter principal, APR, and term.
- Add extra principal if you pay more than P&I.
- Read payment, payoff time, and the first 12 rows.
Results explained
Each payment covers interest first, then principal. Extra principal shortens the schedule.
Quick reference: amortization
Standard fully amortizing loan.
| Item | Detail |
|---|---|
| PMT | P × r / (1 − (1+r)^−n) |
| r | APR/12 |
| n | term in months |
| Taxes/insurance | Not in P&I |
Escrow, PMI, and fees are separate.
How the estimate is built
Standard amortizing PMT. Extra is added after interest each month.
Example scenario
$320,000 at 6.5% for 360 months is about $2,023 P&I with no extra.
FAQ
Why only 12 rows?
Enough to see the early interest-heavy years. Full payoff totals are in the result.
Biweekly?
Use the biweekly mortgage calculator.
ARM?
Use the ARM mortgage calculator — this schedule assumes a fixed rate.