Worked examples
Use these scenarios to understand the mechanics before changing the inputs to match your own statement.
Example 1: $6,000 balance at 24% APR
A $6,000 balance at a modeled monthly rate of 2% accrues about $120 interest in the first month. With a $250 payment, roughly $130 reduces principal that month. The next month begins with a lower balance; interest decreases if the rate and payment remain constant.
Example 2: Why $250 and $350 payments differ
On the same $6,000 balance, increasing a monthly payment from $250 to $350 pays down principal faster. The calculator shows the estimated payoff month and interest total for either amount. This comparison assumes no new spending or fees.
Example 3: A balance-transfer fee
A $5,000 transfer with a 3% fee adds $150 to the transferred balance in this model. At a 0% introductory APR for 18 months, $300 per month would reduce the balance to zero within that promotional period if all assumptions hold. Compare that result against keeping the balance at the current APR.
Example 4: Utilization change
If reported balances total $2,400 and limits total $10,000, aggregate utilization is 24%. A $1,000 payment would reduce that simple ratio to 14%, assuming no other changes. Credit reporting timing and individual-card utilization may still matter.
Example 5: Daily interest approximation
A $3,000 average daily balance at 22% APR over 30 days yields an illustrative $54.25 in interest using 3,000 × 0.22 ÷ 365 × 30. Actual issuer interest can differ with daily changes and compounding conventions.
Example 6: Minimum-payment trap
A minimum of 2% of balance, subject to a $35 floor, falls as the balance falls. A fixed $150 payment may reduce the debt faster than that decreasing minimum. The simulation deliberately omits fees, rate changes, and issuer-specific minimum formulas.