Credit Card Calculator
Discover the real cost of credit card debt. Calculate your payoff timeline with any monthly payment, see how the minimum payment trap keeps you in debt for years, and find out how much interest you save by paying more each month.
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How It Works
Months to payoff = -log(1 - Balance x monthly_rate / Payment) / log(1 + monthly_rate). This shows exactly when you reach zero balance and the total interest you will pay over that period.
n = -log(1 - B x r / PMT) / log(1+r)$5K balance, 20% APR, $200/mo = 32 months, $1,296 interestIf minimum payment is 2% of balance, most goes to interest. At 20% APR the monthly interest on $5,000 is $83. A 2% minimum of $100 only reduces the balance by $17 per month, taking over 200 months to pay off.
Min payment = max(2% x balance, $25)$5K at 20% APR, minimums only = 22 years, $6,500+ interest!Annual interest = Balance x APR. Monthly = Balance x APR / 12. Daily = Balance x APR / 365. This reveals the real cost of carrying any balance and provides motivation to pay it down aggressively.
Daily interest = Balance x APR / 365$5,000 at 20% APR = $2.74/day or $82.19/month in interestEvery dollar above the minimum goes directly to principal. Paying $300 instead of $200 per month on $5,000 at 20% APR reduces payoff from 32 to 19 months and saves approximately $500 in total interest.
Interest saved = (min payment total) - (higher payment total)$5K, 20%, pay $300 vs $200 = save $500, pay off 13 months soonerIf you get a 0% APR card for 12 months with a 3% transfer fee: $5,000 x 3% = $150 fee. But 12 months at 20% APR = $1,000 in interest. Net savings of $850 if you pay off the balance during the promotional period.
Savings = Interest avoided - Transfer fee$5K balance, 0% for 12mo, 3% fee = save approximately $850List all debts by APR from highest to lowest. Pay minimums on all debts. Direct all extra money toward the highest APR card. This minimizes total interest paid across all debts mathematically.
Pay highest APR balance first with extra funds20% APR card paid before 15% APR card saves maximum interestQuick Reference
Common examples — verify instantly above.
Minimum payments only
$5K balance, 20% APR
22 years, $6,500+ interest!
$200/mo payoff
$5K balance, 20% APR
32 months, $1,296 interest
Daily interest
$5K at 20% APR
$2.74 per day
Monthly interest
$10K at 22% APR
$183.33 per month
Extra $100/mo
$5K, 20%, pay $300 vs $200
Save $500, 13mo sooner
Balance transfer
$5K, 3% fee, 0% for 12mo
Save approximately $850
APR comparison
Credit card 20% vs loan 7%
Pay card first always
Avalanche method
$5K@20% + $3K@15%
Pay 20% card first
Tips & Shortcuts
Pay more than the minimum every single month. Even an extra $50 on a $5,000 balance at 20% APR saves hundreds of dollars in interest.
The debt avalanche method — highest APR first — minimizes total interest. The debt snowball — smallest balance first — provides psychological wins. Choose the approach that keeps you motivated.
Never carry a credit card balance at high APR if you can avoid it. Charge only what you can pay in full each month.
Balance transfers to 0% APR promotional cards can save significant interest, but only if you pay off the full balance before the promotional period expires.
Most credit cards offer a grace period of 21 to 25 days. If you pay your full statement balance before the due date, you pay zero interest on purchases.
Call your card issuer and request a lower APR. Issuers frequently reduce rates for customers with good payment history. One phone call can save substantial interest.
Common Mistakes to Avoid
Making only the minimum payment each month
On a $5,000 balance at 20% APR, minimum payments take over 22 years and cost $6,500 in interest — more than the original balance. Always pay substantially more than the minimum.
Closing paid-off credit cards immediately
Closing old accounts reduces total available credit and shortens average account age, both of which can lower your credit score. Keep old no-annual-fee accounts open and unused.
Carrying a balance to build credit history
You do not need to carry a balance to build credit. Charge regular purchases and pay in full each month. This builds excellent credit history with zero interest cost.
Not knowing your APR before making large credit card purchases
Store credit cards often charge 25% to 29% APR. Knowing your rate before using credit for large purchases helps you make an informed decision about whether to finance or use savings.
Making only one payment per month
Making two smaller payments during the month reduces your average daily balance, which reduces the interest charged. Some cards allow multiple payments with no penalty.
Ignoring the balance transfer fee when evaluating a 0% offer
A 3% to 5% transfer fee on a $10,000 balance is $300 to $500 upfront. Always calculate whether the interest savings during the promotional period exceed this upfront fee.
Frequently Asked Questions
It depends entirely on the balance, APR, and monthly payment. Paying only the minimum on a $5,000 balance at 20% APR can take 15 to 22 years and cost more in interest than the original balance. Use the Payoff Planner tab to see your specific timeline.
Credit card minimum payments are deliberately set very low, typically 1% to 2% of the balance or $25, whichever is higher. At this rate most of each payment covers interest with barely any reducing principal. This keeps you in debt for decades and generates enormous interest revenue for card issuers.
Average credit card APR is about 20% to 24% in 2024. Premium rewards cards often carry higher APRs. Store credit cards commonly charge 25% to 29%. This is extremely high compared to auto loans at 5% to 8% or mortgages at 6% to 7%.
If your credit card APR is 20%, paying it off is a guaranteed 20% return — far exceeding any typical investment return. Always eliminate high-interest credit card debt before investing, except up to the employer match in your 401k.
A balance transfer moves debt from a high-APR card to a new card with a 0% promotional APR, typically lasting 12 to 18 months. This can save hundreds in interest if you pay off the full balance before the promotional period ends. Transfer fees are typically 3% to 5% of the balance.
Daily interest = Balance x APR / 365. A $5,000 balance at 20% APR costs $2.74 per day in interest, adding up to over $1,000 per year. Use the Interest Cost tab to calculate your specific daily and monthly interest charges.
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