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What does your payment do to the debt?
Estimate payoff time and interest under a constant-payment scenario.
Example scenario
Editable demonstration inputs, not verified industry benchmarks. Enable JavaScript to calculate your own scenario.
- Starting debt balance
- $1,000,000
- Nominal annual interest rate
- 8 %
- Monthly payment
- $20,000
Payoff period
Example result only, not a forecast or promise.
- Total modeled interest
- $220,447
- Total modeled payments
- $1,220,447
- First-month principal paid
- $13,333
What to do with this result
Check debt covenants, prepayment fees, and minimum cash needs before committing free cash flow to repayment.
Know what is inside the model.
Planning model, not personalized financial advice. Your inputs remain in your browser.
Calculation method
Monthly interest = opening balance × annual rate / 12. Apply payment to interest, then principal, until paid off.
Assumptions and limitations
- Monthly compounding with payments at month-end.
- No fees, rate changes, prepayment penalties, tax effects, or additional borrowing.
- Calculated up to 1,200 months; final payment is reduced to the remaining balance plus interest.