Other Finance
Credit Card Calculator
See the time and interest required to pay off a credit card balance.
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Formula
$$I_t = B_{t-1}\cdot r,\qquad P_t = \text{Payment} - I_t,\qquad B_t = B_{t-1}-P_t$$
Where
I_tmonthly interestB_tbalanceP_tprincipal portionrmonthly APRtmonth index