Loan repayment
Estimate monthly payments, interest and payoff time, including optional extra payments.
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
- r = Nominal annual rate ÷ 1200; Monthly principal and interest = P × r ÷ (1 − (1+r)^−n); r=0: P ÷ n; Payment ≤ Ending balance + Modeled interest
- Worked example: 1200 ÷ 12 = 100 (r=0); 10000 × 0.01 ÷ (1 − 1.01^−12) ≈ 888.4878868
- Supported input limits: Initial principal or balance: 0 ≤ x ≤ 1000000000000; Nominal annual rate: 0 ≤ x ≤ 1000; Months: 1 ≤ x ≤ 1200; 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
