Estimate the interest barrier
A rough monthly interest estimate is balance multiplied by APR divided by 12, although issuers commonly use an average daily balance and daily periodic rate. The statement gives the authoritative charge.
Understand minimum-payment drift
When a minimum is calculated as a percentage of balance, it can fall as the balance falls. Paying only that declining amount can extend payoff much longer than keeping the initial dollar payment fixed.
Keep new spending outside the plan
A payoff model assumes no new purchases unless modeled. Separate current spending from the old balance so progress is not hidden by new charges.
Example: payment above interest
A $6,000 balance at 24% APR has a rough first-month interest estimate near $120. A $150 payment reduces principal by only about $30 before fees or daily-balance differences; a larger fixed payment changes the trajectory materially.
What to check before you decide
- The linked calculator is a simplified fixed-APR, no-new-purchase model.
- Contact the issuer promptly if minimum payments are not affordable.
Sources behind this guide
These official and primary sources let you verify rules, definitions, and terms that may change.
CFPB — Financial terms glossary↗