APR makes the same balance behave differently
At 24% APR, the first month of simple modeled interest on $10,000 is about $200. A $250 payment initially cuts principal by only about $50, while a $500 payment cuts it by about $300 before later interest declines.
Use a fixed payment instead of a falling target
If you keep paying the same fixed dollar amount as the balance falls, more of each later payment reaches principal. A percentage-based minimum usually declines with the balance and can stretch repayment.
Stop adding new purchases to the model
A payoff date assumes no new charges, fees, missed payments, cash advances, or rate changes. Separate current spending from the payoff card where practical and reconcile the calculator with each statement.
Example: $300 versus $500 per month at 24%
In a fixed-rate monthly model, $300 takes about 56 months and produces roughly $6,644 of interest. Paying $500 takes about 26 months and roughly $2,899 of interest—about 30 months sooner and $3,745 less interest.
What to check before you decide
- Illustrations assume a constant 24% APR and end-of-month payments; real cards may use daily balances and variable rates.
- If the required minimum is unaffordable, contact the issuer promptly rather than relying on a calculator alone.
Sources behind this guide
These official and primary sources let you verify rules, definitions, and terms that may change.
CFPB — Credit card three-year repayment disclosure↗CFPB — Understanding minimum payments↗CFPB — What to do if you cannot pay a credit card bill↗