Credit Card Calculator

Estimate credit card payoff time, monthly interest, and total cost using a planned monthly payment. Compare fixed-payment payoff to a minimum-only schedule.

998.4K uses Updated · 2026-05-14 Runs locally · zero upload
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How to Use Credit Card Calculator

The Credit Card Calculator answers two questions: how long will it take, and how much will it cost?

  1. Enter current balance — Your card statement balance.
  2. Enter APR — The card’s stated annual percentage rate.
  3. Enter planned monthly payment — Realistic fixed amount you can commit to.
  4. Adjust minimum-payment rule — Default is 2% of balance with a $25 floor; override if your card differs.
  5. Read the result — The Credit Card Calculator shows months to payoff, total interest, total paid, and the minimum-only contrast.

Formula & Theory - Credit Card Calculator

The Credit Card Calculator simulates monthly amortization on a revolving balance:

i = APR / 12

For each month:
  interest = balance × i
  payment  = min(planned, balance + interest)
  balance  = balance + interest − payment
  totalPaid += payment

Months = count of months until balance ≤ 0
TotalInterest = TotalPaid − OriginalBalance

The interest trap: Credit card APRs are typically 18–28%, far higher than most consumer loans. Minimum payments (often 2% of balance) barely cover interest. Paying $300/month on a $5,000 balance at 22% APR can take roughly 20 months and cost about $1,100 in interest. Paying only the minimum could stretch payoff beyond 25 years and triple the interest.

Two simple rules the Credit Card Calculator illustrates:

  1. Pay more than the minimum — Even an extra $50/month dramatically shortens payoff time.
  2. Pay it down fast — Every month of carried balance is interest expense; aggressive payoff almost always beats almost any investment return.

Use Cases for Credit Card Calculator

  • Debt payoff planning — Set a realistic target month for becoming debt-free.
  • Monthly budgeting — Decide how much to allocate to credit card payoff vs. savings.
  • Minimum-payment reality check — See exactly how expensive minimum payments are.
  • Balance transfer evaluation — Pair with the Balance Transfer Calculator to compare strategies.
  • Sub-credit-line planning — If your card has a maximum, model how quickly you can free up credit.
  • APR negotiation backup — Quantify the savings if you can negotiate a lower APR.

The Credit Card Calculator is the simplest reality check in personal finance — and the most often-ignored.

Frequently asked questions about Credit Card Calculator

What does the Credit Card Calculator estimate?

It computes the months to pay off your balance, total interest paid, total amount paid, and compares your planned payment against a minimum-only schedule.

Why is paying only the minimum so expensive?

Minimum payments are typically 1–3% of the balance plus interest, so most of the payment is interest. The Credit Card Calculator shows the dramatic difference vs. a fixed monthly payment.

Can I model new purchases?

This Credit Card Calculator assumes no new charges. For a true 'snowball' or 'avalanche' across multiple cards, use the corresponding debt calculators.

Is my data stored?

No. All calculations happen in your browser; nothing is sent to a server.