Credit Card Minimum Payment Calculator
Enter your credit card balance, interest rate, and minimum payment rules to see exactly how long payoff takes and how much interest you will owe. Add a fixed monthly payment to compare both scenarios side by side. The amortisation schedule lets you see every payment broken down into principal and interest.
How minimum payments are calculated
Credit card issuers use one of a few standard formulas to set the minimum payment due on your monthly statement. The most common method is a flat percentage of the closing balance, typically 1% to 3%, with a dollar floor such as $25 to ensure very small balances still require a meaningful payment. The second most common method takes a smaller percentage of the balance (often 1%) and adds that month's interest charges on top. This "percentage plus interest" structure is significant because it guarantees you always pay at least the full interest charge for the period, preventing negative amortisation where a balance grows despite regular payments. A third variant also adds any fees charged during the statement cycle to the calculation. Regardless of method, your minimum is always capped at the full outstanding balance if that balance is smaller than the calculated minimum.
Why minimum payments cost so much
The key to why minimum payments drag on for so long lies in how they shrink over time. As you pay down your balance, the minimum payment calculated as a percentage of that balance also falls. A lower payment means less principal is paid each month, which keeps the remaining balance higher, which continues to generate interest. This creates a slow decline curve: early payments go mostly to interest, later payments gradually shift toward principal, but progress is painfully slow. On a $3,500 balance at 22.99% APR using a 2% flat percentage method, the first minimum payment is about $70. By month 12 the minimum has already dropped below $60 and interest still accounts for more than half the payment. This treadmill effect means cardholders who pay only the minimum often spend four to six times as long in debt as those who commit to a fixed payment above the minimum.
Fixed payment vs minimum payment: the practical difference
Switching from minimum payments to a fixed monthly payment - even just 50% to 100% above the starting minimum - can cut your payoff time by years and save thousands of dollars in interest. The reason is straightforward: a fixed payment does not shrink as the balance falls, so an increasingly large share of each payment goes to principal. This accelerates balance reduction, which reduces the interest charged the following month, which accelerates it further. For example, on the same $3,500 balance at 22.99% APR, a fixed $150/month payment (compared to a first minimum of about $70) cuts payoff from over 17 years to roughly 2.5 years and saves around $5,000 in interest. Even a fixed $100/month - less than one and a half times the initial minimum - reduces total interest by more than $3,000.
How to use this calculator
Enter your current balance and APR from your credit card statement, then select the minimum payment method your issuer uses (check the "Minimum Payment Calculation" disclosure on your statement if unsure - most US issuers use either flat 2% or 1% + interest). Set the minimum percentage and floor payment to match your card terms. The calculator instantly shows your first minimum payment, how many months it takes to pay off the full balance, and total interest charged. For a powerful comparison, enter a fixed monthly amount you could realistically commit to. The tool then shows how much faster you pay off the debt, how much interest you avoid, and the full amortisation schedule for the minimum-payment scenario. Use the schedule tab to see exactly how each payment breaks down each month.
Common minimum payment methods by issuer type
| Method | Typical rate | Floor | Notes |
|---|---|---|---|
| Flat % of balance | 2% of balance | $25 | Most common. Easy to predict. Early payoff is slow because payments shrink with balance. |
| % of balance + interest | 1% of balance + interest | $25 | Used by many US issuers. The "1% + interest" structure means you always at least cover interest. |
| % of balance + interest + fees | 1% of balance + interest + fees | $25-$35 | Adds any late or annual fees charged that cycle to the minimum. |
| Fixed flat dollar amount | $25-$35 | $25 | Rare. Balance never shrinks if interest exceeds the fixed payment. |
| Greater of % or fixed | 2% or $10-$25 | $10 | Issuer uses whichever calculation is larger. |
How different card issuers typically calculate the minimum payment due each month.
Frequently asked questions
What happens if I only pay the minimum on my credit card?
You avoid a late payment fee and protect your credit score from a missed-payment mark, but you maximise the total interest you pay over time. Because the minimum payment shrinks each month along with your balance, paying only the minimum can extend your payoff timeline to 10-20+ years on a typical card balance, and you may pay two to five times the original balance in interest charges alone.
How is the minimum payment on a credit card calculated?
Most issuers use one of two methods. The first takes a flat percentage of your statement balance, commonly 1% to 3%, subject to a dollar floor such as $25. The second takes a smaller percentage of the balance (often 1%) and adds the full monthly interest charge. Both methods ensure the payment covers at least the interest due (in the second method, this is explicit; in the first, the percentage is calibrated to exceed the interest rate). Your statement will disclose which method your issuer uses.
Does paying only the minimum hurt my credit score?
Paying at least the minimum on time does not hurt your credit score directly. However, carrying a high balance relative to your credit limit (your credit utilisation ratio) does suppress your score. Keeping a high balance by paying only the minimum means your utilisation stays elevated, which can hold your score down until the balance is significantly reduced.
What is a good fixed payment to aim for?
A commonly cited target is 3% to 5% of the original balance per month rather than the declining minimum, but the right amount depends on your budget. The most important thing is that the payment covers more than the monthly interest charge. You can use this calculator to work backward: enter a payoff goal (e.g. pay off in 24 months) and adjust the fixed payment until the months match. As a rule of thumb, doubling your starting minimum payment typically cuts payoff time by more than half.
Can the minimum payment ever be lower than the interest charged?
With the "flat percentage" method it is theoretically possible on a very high-APR card if the percentage is low and the balance is modest. When payment is less than interest charged, the unpaid interest gets added to the balance - negative amortisation - causing the balance to grow despite making payments. The CARD Act of 2009 requires issuers to disclose when this occurs, but it is rare on modern cards that generally set floors high enough to cover interest on typical balances.
What is the CARD Act 2009 disclosure on minimum payments?
The Credit CARD Act of 2009 requires US credit card issuers to print a "Minimum Payment Warning" on every statement. This box shows the total time and cost to pay off the current balance making only minimum payments, and it shows a comparison payment that would pay off the balance in 36 months. This disclosure was designed to make the long-term cost of minimum payments visible to cardholders at the moment they receive their bill.