Credit Card Payoff Time Calculator — Rex's Toolbox

Rex says

Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.

Try a scenario

Click to load — tweak from there.

Inputs

Current balance($)

Purchase APR(%)

Monthly payment($)

Extra payment to test($/mo)

Result

Months to payoff

Total interest paid

$3,000

Months with extra payment

Interest with extra payment

$1,900

Interest saved

$1,100

Months saved

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How to use this

1Enter current balance ($).
2Enter purchase apr (%).
3Enter monthly payment ($).
4Enter extra payment to test ($/mo).
5Read your months to payoff on the right — it updates as you type.
6Hit Share to keep the scenario or send it to someone.

About this calculator

A credit card balance is a compounding problem disguised as a monthly bill. Because the minimum payment is usually a small percentage of the balance plus interest, it falls as the balance falls, which stretches payoff for years and can more than double what you repay. This calculator answers the two questions that matter: how long the balance takes to clear at the payment you actually make, and how much interest that costs. It also models a fixed extra payment so you can see the leverage — on a typical 24% APR balance, an extra $100 a month often cuts years off the timeline. Results assume no new purchases on the card; adding charges resets the math.

FormulaEach month: interest = balance × APR ÷ 12; balance = balance + interest − payment. Repeat until zero.

Worked example

Using the values the calculator loads with:

Inputs

Current balance: 6500 $
Purchase APR: 24.99 %
Monthly payment: 250 $
Extra payment to test: 100 $/mo

Results

Months to payoff: 38
Total interest paid: $3,000
Months with extra payment: 24
Interest with extra payment: $1,900
Interest saved: $1,100
Months saved: 14

What each field means

Inputs

Current balance ($): The current balance used in the calculation, measured in $. Starts at 6500 $ so you have a working example on load. Accepted range: 0–200000 $.
Purchase APR (%): The purchase apr used in the calculation, measured in %. Starts at 24.99 % so you have a working example on load. Accepted range: 0–40 %.
Monthly payment ($): The monthly payment used in the calculation, measured in $. Starts at 250 $ so you have a working example on load. Accepted range: 0–20000 $.
Extra payment to test ($/mo): The extra payment to test used in the calculation, measured in $/mo. Starts at 100 $/mo so you have a working example on load. Accepted range: 0–20000 $/mo.

Results

Months to payoff: Returned as a whole number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Total interest paid: Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Months with extra payment: Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Interest with extra payment: Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Interest saved: Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Months saved: Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.

FAQ

Why does my card statement show a longer payoff?

Statements use the issuer's declining minimum payment. This tool uses the fixed payment you enter, which clears the balance far faster.

Does the tool assume new purchases?

No. Any new spending on the card extends the timeline and adds interest that is not shown here.

Is a balance transfer better?

Often, if you can clear most of the balance inside the promotional window and the transfer fee is smaller than the interest avoided.

What if the payment never clears the balance?

If your payment is below the monthly interest charge, payoff shows as capped. That means the balance grows — raise the payment or seek a hardship rate.

Accuracy and limitations

Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.

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Cite this calculator

Writing about this topic? Grab a citation — every link helps keep these tools free.

APA

RevenueLab. (2026). Credit Card Payoff Time Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/credit-card-payoff-time-calculator

HTML

<p>Source: <a href="https://www.revenuelab.fyi/toolbox/credit-card-payoff-time-calculator" target="_blank" rel="noopener">Credit Card Payoff Time Calculator — RevenueLab</a> (2026).</p>

Markdown

Source: [Credit Card Payoff Time Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/credit-card-payoff-time-calculator) (2026).