Credit Card Interest Calculator
Discover the true cost of minimum payments — and how much faster you can get free.
| Monthly Payment | Payoff Time | Total Interest | Interest Saved |
|---|---|---|---|
| Minimum only | Never paid off | $31,789 | — |
| $100/mo fixed | 11y 5m | $8,678 | $23,111 |
| $200/mo fixed | 2y 10m | $1,750 | $30,039 |
| $300/mo fixed | 1y 9m | $1,022 | $30,767 |
| $500/mo fixed | 1y 0m | $574 | $31,214 |
The Minimum Payment Trap
Credit card minimum payments are one of the most financially damaging features in consumer finance — and they are intentionally designed that way. Card issuers typically set minimums at 1–2% of the outstanding balance or $25, whichever is higher. At that rate, the minimum payment on a $5,000 balance at 22% APR is roughly $100/month. Of that $100, approximately $92 goes straight to interest. Your balance drops by just $8.
The result: if you carry a $5,000 balance and pay only minimums, you will make payments for over 15 years and pay more than $7,000 in interest — on top of the original $5,000. You will pay back more than double what you borrowed, over more than a decade, for the privilege of making minimum payments. This is the minimum payment trap, and it affects millions of American households.
The solution is straightforward but requires discipline: pay significantly more than the minimum, every month, and don't add new charges to balances you are actively paying down. Even an extra $100/month above the minimum on that $5,000 balance cuts the payoff time from 15 years to under 3 years and saves approximately $5,500 in interest.
The Minimum Payment Formula
(Often just $5–$15 on a $5,000 balance at 22% APR)
Minimum vs. Fixed Payment: $5,000 at 22% APR
| Monthly Payment | Payoff Time | Total Interest | Interest Saved vs Min |
|---|---|---|---|
| Minimum only (~2%) | 15+ years | $7,400+ | — |
| $100/month fixed | 6 years 4 months | $2,614 | $4,786 |
| $200/month fixed | 2 years 10 months | $1,102 | $6,298 |
| $300/month fixed | 1 year 10 months | $712 | $6,688 |
| Full balance (paid now) | 0 | $0 | $7,400+ |
Key Credit Card Terms
- APR (Annual Percentage Rate)
- The yearly interest rate on your credit card balance. The national average for accounts that carry a balance is 21–23%. Store cards often exceed 30% APR.
- Grace Period
- The time between a billing cycle end and payment due date — typically 21–25 days. Paying your full statement balance during the grace period avoids all interest charges on purchases.
- Minimum Payment
- The smallest amount you can pay without incurring a late fee — typically 2% of balance or $25. Paying only minimums dramatically extends payoff time and maximises interest cost.
- Balance Transfer
- Moving a credit card balance to a new card with a lower or 0% promotional APR. Balance transfer fees of 3–5% typically apply.
- Cash Advance APR
- Usually higher than the purchase APR (often 25–30%), with no grace period — interest accrues immediately from the day of the cash advance.
- Penalty APR
- A higher rate (often ~30%) applied after a serious payment violation such as being 60+ days late. Applied only to new charges under the CARD Act.
- Credit Limit
- The maximum balance the issuer permits on the card. High utilisation (balance ÷ limit) negatively impacts your credit score.
- Revolving Credit
- Credit that can be borrowed, repaid, and borrowed again — unlike instalment loans. Credit cards are the most common form of revolving credit.
"Minimum payments are designed to keep you paying — and paying — for years. The Silent Debt explains the psychology behind why we accept this, and how to break the cycle."
Read the credit card debt guide at The Silent Debtthesilentdebt.com
Frequently Asked Questions
Why do minimum payments take so long to pay off a credit card?
Minimum payments are intentionally designed to extend the repayment period — this maximises interest revenue for the card issuer. A typical minimum of 2% of balance means most of each payment covers interest, barely touching the principal. On a $5,000 balance at 22% APR, paying only minimums takes over 15 years and costs more than $7,000 in interest on top of the original $5,000.
What is the average credit card APR?
As of 2024-2026, the average credit card APR in the United States is approximately 21–23% for accounts that carry a balance. Premium rewards cards often run 25–29% APR. Store cards can exceed 30% APR. Balance transfer promotional rates (0% for 12–21 months) are the main exception — but revert to high rates if the balance isn't cleared.
What is a grace period on a credit card?
The grace period is the time between the end of a billing cycle and the payment due date — typically 21–25 days. If you pay your entire statement balance during the grace period, no interest is charged on purchases made that cycle. Grace periods don't apply to cash advances or balance transfers, which accrue interest immediately.
What is a balance transfer and does it make sense?
A balance transfer moves your balance from a high-rate card to a new card offering a 0% promotional APR — typically for 12–21 months. Balance transfer fees of 3–5% apply upfront. If you can pay off the transferred balance before the promotional period ends, this can save hundreds or thousands in interest. The key risk: the revert rate after the promo period is often higher than your original card.
How does compounding affect credit card debt?
Credit card interest typically compounds daily, using the average daily balance method. Your monthly interest charge = (APR ÷ 365) × days in billing cycle × average daily balance. Daily compounding means interest accrues on interest continuously — accelerating how quickly balances grow when only minimum payments are made.
Will paying more than the minimum improve my credit score?
Yes, in two ways. First, making more than minimum payments reduces your credit utilisation ratio (balance ÷ credit limit) faster — lower utilisation is one of the biggest positive factors in credit scoring. Second, it reduces the risk of late or missed payments as balances become more manageable. Even $50–$100 above the minimum per month makes a meaningful difference.
What is a penalty APR and when does it apply?
A penalty APR is a significantly higher interest rate (often 29.99%) that card issuers apply when you miss a payment by 60+ days or violate other card terms. Under the CARD Act, penalty APRs can only apply to new charges after a violation (not retroactively to your existing balance) and must be removed after 6 consecutive on-time minimum payments.
Is it better to pay off one card completely or spread payments across multiple cards?
If you have multiple cards, paying off the highest-rate card first (avalanche method) saves the most money. If you're juggling many balances, consider consolidating into a personal loan or balance transfer card to simplify payments and potentially reduce your blended rate. Use the Debt Payoff Calculator to model your specific scenario across multiple debts.