Debt payoff estimator
Compare repayment time with extra payments and identify balances that cannot be paid off in this model.
Your inputs
The editable example is illustrative. Enter your own dimensions, operating data, prices, and fees. Results update as you edit.
Calculations run in your browser. Inputs are not saved or sent to analytics.
Your result
Complete the inputs to see your result.
How it works
- B′ = B × (1 + Nominal annual rate ÷ 1200) + Recurring or attributable fee − Payment; Payment ≤ Ending balance + Modeled interest + Recurring or attributable fee
- Worked example: 1000 ÷ 100 = 10 months (r=0); 1000 × 0.01 = 10 Modeled interest ⇒ Payment 10 = Modeled interest 10 ⇒ ΔB = 0
- Supported input limits: Initial principal or balance: 0 ≤ x ≤ 1000000000000; Nominal annual rate: 0 ≤ x ≤ 1000; Payment: 0 ≤ x ≤ 1000000000000; Recurring or attributable fee: 0 ≤ x ≤ 1000000000000; Extra monthly payment: 0 ≤ x ≤ 1000000000000
Assumptions and limitations
Amounts use the selected currency without conversion. Rates, prices, fees and index values are assumptions you supply, not current offers or legal tax rates. Financial simulations retain full period precision and stop at 1200 periods; displayed currency uses its minor units. Taxes, fees and market changes are included only where entered.
Sources
- CFPB — amortization and principal/interest Sources reviewed: 2026-10-06
