How we calculate
Each month, interest accrues on the balance; the monthly payment is then deducted from the total. The calculator repeats this until the balance reaches zero — or flags that, at this payment pace, the debt is never paid off.
Formula used
Next month's balance = (previous balance × (1 + monthly interest rate)) − monthly payment.
Saldo do mês = saldo anterior × (1 + taxa) − pagamento
Practical example
With a R$ 3,000 balance, 15% monthly interest and a R$ 500 monthly payment, the calculator shows the months needed and total interest paid.
How to interpret the result
If the debt is never paid off, the payment doesn't even cover interest — increase the payment or consider a cheaper credit line (like a personal loan) to replace the revolving debt.
Limitations
Assumes a constant monthly rate and no new charges during the period. Does not account for IOF tax or additional fees.