Amortization Calculator
Solve the loan payment, then read INT, PRN and BAL for any payment range P1–P2 — the AMORT worksheet path on the BA II Plus, driven by your own numbers.
Loan & range
Result (P1–P2)
Worked example (T8): period 1 of the T1 loan → INT 500.00, PRN 99.55, BAL 99,900.45 (unrounded PMT inside).
BA II Plus keystrokes
- [2ND] [CLR TVM]
- [2ND] [P/Y]12[ENTER]
- [↓]12[ENTER]
- [2ND] [QUIT]
- 360[N]
- 6[I/Y]
- 100000[PV]
- 0[FV]
- [CPT][PMT]
- [2ND] [AMORT]1[ENTER][↓]1[ENTER]
- [↓][CPT]
Key map (same as the simulator): 2ND P/Y = P/Y worksheet · 2ND BGN = mode · 2ND CLR WORK = clear the open worksheet · 2ND CLR TVM = clear TVM.
Worked example — first payment of the T1 loan (T8)
360-month, 6% mortgage of 100,000 (P/Y = C/Y = 12): period 1 interest 500.00, principal 99.55, balance 99,900.45. The engine amortizes with the unrounded PMT, just like computing PMT and opening AMORT on the calculator.
Frequently asked questions
Why does INT + PRN ≠ PMT on my bank statement?
It does — INT and PRN are the two halves of each payment. Here PRN is shown positive as the balance reduction: PRN = −(PMT + INT). Banks may quote rounding to cents per period.
How do I amortize year 2?
Set P1 = 13 and P2 = 24: the range covers payments 13 through 24 and returns the interest and principal totals for that year plus the balance after payment 24.
Does this handle BGN loans?
The form assumes END (standard mortgages). The simulator on the home page supports BGN; interest in the first period of an annuity-due is zero.