Credit Card Payoff Calculator Widget

Add a credit card payoff calculator. Readers enter the balance and APR and either a monthly payment, to see how long it takes and the interest it costs, or a number of months, to see the payment that clears it in time.

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<iframe src="https://a2z.tools/embed/w/credit-card-payoff-calculator" title="Credit Card Payoff Calculator by A2Z Tools" width="100%" height="550" style="border:0;width:100%" loading="lazy" allow="clipboard-write"></iframe>

A plain iframe. Works everywhere, including site builders that strip scripts. Adjust height if your content needs more room.

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How it works

The widget follows the same month-by-month method as the A2Z Credit Card Payoff Calculator: each month the balance is charged APR / 12 in interest and then the payment is taken off, until it reaches zero; the last payment is only what is left, so it is usually smaller. If the payment is not larger than the first month's interest, the balance can never fall, and the widget says so instead of printing a number. In target mode it uses the standard level-payment formula to find the fixed payment that clears the card in the chosen number of months.

Calculation method

  • Monthly rate r = APR / 12 / 100; B = balance
  • Each month: balance = balance x (1 + r) - payment; the final payment clears what is left
  • Payment to clear in n months = B x r / (1 - (1 + r)^-n)
  • Warning when payment <= B x r (the balance never falls); money displayed to 2 decimals

Worked examples

Fixed payment of 200

Inputs: Balance 5,000; APR 22%; 200 a month

Result: 34 months; total interest 1,749.88; final payment 149.88

The first month's interest is 91.67, so less than half of the first payment reduces the balance.

Clear it in two years

Inputs: Balance 5,000; APR 22%; target 24 months

Result: Payment 259.39 a month; total interest 1,225.38

The level-payment formula with r = 0.22 / 12.

Paying 100 a month

Inputs: Balance 5,000; APR 22%; 100 a month

Result: 137 months; total interest 8,678.06; final payment 78.06

Interest adds more than the original balance again.

Limitations

  • Monthly APR / 12 interest, not the daily average-balance method most issuers use.
  • Ignores new purchases, fees, promotional rates and a changing minimum payment.
  • Grace periods, penalty APRs after a late payment and separate cash-advance balances are not modelled.
  • Payments are assumed on the same day each month; late or missed payments and their fees are not modelled.

Where publishers use it

  • Debt-advice charities and credit-counselling sites
  • Personal-finance posts on the cost of paying only the minimum
  • Balance-transfer and consolidation-loan comparison pages
  • Money lessons for students getting their first card
  • University money-management workshops and financial-wellness newsletters

Questions

Why does the widget refuse some payments?

If the payment is equal to or less than the interest charged in a month, the balance never goes down. For 5,000 at 24% APR that is 100 a month.

Does it include new purchases or fees?

No. It assumes you stop using the card, the APR stays the same and no annual or late fees are added.

How do card issuers calculate interest?

The CFPB explains that many issuers charge interest daily on the average daily balance at a daily periodic rate, so real statements differ slightly from this monthly APR / 12 model - usually by a small amount.

How much faster is a higher payment?

5,000 at 22% APR takes 34 months at 200 a month (1,749.88 interest) but 24 months at 259.39 a month (1,225.38 interest).

What does paying only 100 a month cost?

At 22% APR, 5,000 takes 137 months - over 11 years - and 8,678.06 of interest at 100 a month, against 1,749.88 at 200 a month. Below 91.67 a month the balance never falls at all.

Would a balance transfer help?

Often, if the transfer fee and the rate after the promotional period are lower than your current APR. Enter the post-promotion APR and the fee added to the balance to see the worst case.

Why does paying only the minimum take even longer than this shows?

Issuers usually set the minimum as a small share of the balance with a fixed floor, so it shrinks as the balance shrinks. This widget holds the payment fixed; a falling minimum stretches repayment much further.

Does paying twice a month help?

Slightly. Because most issuers charge interest on the average daily balance, paying part of the bill mid-cycle lowers that average. The monthly model here cannot show the difference, which is usually small.

What is a daily periodic rate?

The APR divided by 365 (some issuers use 360). At 22% APR it is about 0.0603% a day, charged on each day's balance. Summed over a 30-day month it comes close to this widget's APR / 12, which is why the difference is small.

What does a 0% promotional balance transfer save?

While the promotion lasts, every payment reduces principal. Moving 5,000 to a 0% offer with a 3% transfer fee adds 150 to the balance; paying 259.39 a month would clear about 5,150 in 20 months instead of 24, provided the offer lasts that long - check its expiry date.

Sources

  1. How does my credit card company calculate the amount of interest I owe? - Consumer Financial Protection Bureau (US) . Daily periodic rate on the average daily balance - why statements differ slightly from this model.

Cite or recommend this tool

If you reference this tool in an article, course or documentation, these formats are ready to copy. They are optional - nothing is added to your site unless you paste it.

A2Z Tools Credit Card Payoff Calculator
https://a2z.tools/credit-card-payoff-calculator

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