Credit Card Payoff Calculator

This credit card payoff calculator shows exactly how long it will take to clear your debt and how much interest you will pay along the way. It works as a credit card interest calculator, a credit card payment calculator, and a general credit card calculator in one tool. Enter a balance, an APR, and a fixed monthly payment, and compare that result against making only the minimum each month.

1. Enter your current balance. Use the statement balance from your most recent bill or the live balance from your online account. If you have multiple cards, run each one separately or total them if you plan to attack them with a single combined payment.
2. Enter the APR. Your APR (annual percentage rate) is printed on every monthly statement, usually in a box titled "Interest Charge Calculation." The US average on interest-bearing accounts is currently around 22% to 23%, and store cards regularly run 28% to 31%. Use the purchase APR, not the cash-advance APR, unless you are paying off a cash advance.
3. Set a fixed monthly payment. Try the largest number your budget supports. Even $50 above the minimum can cut years off the payoff. The calculator will show payoff time, total interest, and total amount paid for that exact payment amount.
4. Adjust the minimum payment percentage if your card uses a different formula. Most issuers use 1% to 3% of the balance plus accrued interest and fees, with a floor of $25 to $35.

The results panel gives you three numbers to compare: payoff time, total interest, and total paid. The green savings box shows how much faster you will be debt-free and how much interest you save by sticking to a fixed payment instead of the shrinking minimum. If your payment does not cover the monthly interest charge, the balance will never go down, and the calculator will flag that case. Scroll to the amortization table to see the first 36 months of the minimum-payment schedule, which makes the size of the interest column hard to ignore.

Credit card math runs on daily compounding, not monthly compounding. That is the key difference between a credit card interest calculator and a regular loan calculator. Here are the formulas the issuer uses and the ones this tool uses to solve for payoff time.

1. Daily Periodic Rate and Daily Compounding

Daily Periodic Rate (DPR) = APR ÷ 365

Example: 22.99% APR
DPR = 22.99 ÷ 365 = 0.063% per day (0.00063)

Daily interest on a $5,000 balance:
$5,000 × 0.00063 = $3.15 per day

Over a 30-day cycle, interest accrues against the
average daily balance, so the actual charge is:
Interest = Average Daily Balance × DPR × Days in Cycle

This is why carrying any balance past the grace period is so expensive. Interest is calculated every single day, and each day it is added to the balance that generates the next day's interest charge.

2. Months to Pay Off with a Fixed Payment

N = −log(1 − (r × B) ÷ P) ÷ log(1 + r)

Where:
N = number of months to payoff
r = monthly rate = APR ÷ 12
B = current balance
P = fixed monthly payment
log = natural log

Example: $5,000 at 22% APR, paying $200/month
r = 0.22 ÷ 12 = 0.01833
N = −log(1 − (0.01833 × 5000) ÷ 200) ÷ log(1.01833)
N ≈ 32 months (2 years, 8 months)
Total interest ≈ $1,397

The formula only works when P is larger than the monthly interest (r × B). If your payment equals or is below the interest charge, the balance never shrinks and payoff time is infinite. This credit card payment calculator detects that case and stops the simulation.

3. Minimum Payment Formula

Minimum = greater of:
  (a) Flat floor  ($25 to $35, set by issuer)
  (b) % of balance + interest + late fees
      (typically 1% to 3% of principal, plus
       current month's interest and any fees)

Example: $5,000 balance at 22.99% APR, 2% rule
Monthly interest = 5,000 × (0.2299 ÷ 12) = $95.79
Principal portion = 1% × 5,000 = $50.00
Minimum = 95.79 + 50.00 = $145.79

Next month the balance is slightly lower, so the
minimum drops too. This is the trap: the minimum
shrinks as fast as the balance, stretching payoff
over 15 to 30 years.

Quick Reference: $5,000 Balance at 22% APR

This table shows how much a monthly payment changes the total cost. The same balance, same APR, four different payments:

Going from $150 to $300 a month does not double the cost, it cuts the interest in half and finishes the debt 2.5 years sooner. That is the math behind every extra dollar toward the balance.

A credit card calculator only tells you the outcome for the numbers you enter. The bigger decisions are which strategy to run, whether to move the debt to a 0% card, and how to handle multiple cards at once. This section covers what the raw math cannot.

The Minimum Payment Trap

Card issuers design the minimum payment to keep you in debt as long as legally allowed. After the 2009 CARD Act, statements must show how long payoff will take if you pay only the minimum, and the number is usually shocking. A $5,000 balance at 22% APR with a 2% minimum takes roughly 22 years to pay off, and you will pay around $9,000 in interest on top of the original $5,000. Scale that to a $10,000 balance at 24% and the payoff clock runs past 30 years with interest exceeding the original debt two to three times over.

The trap is that the minimum shrinks as the balance shrinks, so the debt has a long tail. Adding even $25 per month above the minimum typically cuts years off the payoff. A fixed payment that does not decrease is almost always the better strategy.

Balance Transfer Cards: When the Math Wins

A balance transfer card moves your debt to a new card with a 0% introductory APR, usually for 12, 15, 18, or 21 months. You pay a transfer fee (typically 3% to 5% of the amount moved) and then pay down the balance interest-free during the promo window. After the intro period ends, any remaining balance gets charged the standard purchase APR, which is often 20% or higher.

The transfer only pays off if you can clear the full balance before the intro period ends. Miss that deadline and the regular APR applies to whatever is left. Do not put new purchases on the transfer card; purchases usually start accruing interest immediately because your payments are applied to the 0% balance first.

Avalanche vs Snowball for Multi-Card Debt

If you carry balances on more than one card, make the minimum on every card, then throw every extra dollar at one card at a time. Two methods exist for picking which card gets the extra:

• Avalanche (math-optimal): target the card with the highest APR first. Saves the most interest over the full payoff. A 28% store card before a 19% travel card, even if the store card balance is larger.
• Snowball (motivation-optimal): target the card with the smallest balance first. You clear a card faster, which creates momentum. The total interest paid is slightly higher, but the behavioral payoff keeps many people on track.

Run the numbers both ways. If the interest difference is under a few hundred dollars over the life of the payoff, snowball often wins in practice because completion rates are higher. If you are paying thousands more in interest, avalanche is the better call.

How Credit Card Grace Periods Actually Work

If you pay your statement balance in full by the due date, new purchases made during the next billing cycle carry no interest. This is the grace period, and it only exists while you pay in full. The moment you carry any balance from one cycle to the next, the grace period disappears, and every new purchase starts accruing interest from the day it posts. That is why the advice "always pay in full" matters: partial payment costs you interest on both the old carried balance and on anything new you buy.

To restore the grace period, you typically need to pay the statement balance in full for one or two consecutive cycles, depending on the issuer. Check your cardmember agreement for the exact language; some cards reinstate it immediately, others require two clean cycles.