Calculateur de Credit Card Payoff
Estimate payoff time from balance, APR, and monthly payment.
Formula and method
This calculator computes Estimated months, Estimated interest directly in your browser without sending data to an external server.
Mathematical formula
- Estimated months:
(() => { const r=rate ÷ 1200; return r===0 ? balance ÷ payment : payment<=balance × r ? NaN : Math.log(payment ÷ (payment-balance × r)) ÷ Math.log(1+r); })() - Estimated interest:
(() => { const r=rate ÷ 1200; if (r===0) return 0; if (payment<=balance × r) return NaN; const months=Math.log(payment ÷ (payment-balance × r)) ÷ Math.log(1+r); return payment × months-balance; })()
Variables and parameters
- Balance (balance): default value 5000 $.
- APR (rate): default value 22 %.
- Monthly payment (payment): default value 250 $.
Some formulas are undefined for certain input combinations (such as division by zero or logarithms of non-positive numbers). In those cases the live tool displays an alert instead of NaN.
Embed this tool
Paste this snippet into your own site or blog post to embed a live, working copy of this tool. It links back to the full page on SpecWhale.
Frequently asked questions
What equation and variables does Credit Card Payoff Calculator use?
Credit Card Payoff Calculator evaluates outputs such as <strong>Estimated months, Estimated interest</strong> based on inputs including Balance, APR, Monthly payment. Check the Mathematical Method section for the explicit formula.
How can I compare different financial scenarios using Credit Card Payoff Calculator?
You can click the "Add to Compare" button after computing your scenario to pin it to your temporary side-by-side Compare Workbench, allowing you to evaluate loan, rate, or interest differences.
What happens if I enter invalid or zero values into Credit Card Payoff Calculator?
If an input combination is mathematically undefined (such as division by zero or negative square roots), SpecWhale alerts you gracefully rather than returning invalid NaN outputs.
Are my calculations in Credit Card Payoff Calculator saved or private?
All calculations are 100% private and run locally in your Web browser. Your numbers are never uploaded to any server, but can be saved locally to your device or exported as CSV/JSON.
Is Credit Card Payoff Calculator free to use?
Yes. Credit Card Payoff Calculator is completely free, has no usage limit, and does not require an account, email, or API key.
Does Credit Card Payoff Calculator store or upload my data?
No. Credit Card Payoff Calculator calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is Credit Card Payoff Calculator?
Credit Card Payoff Calculator uses a standard formula (see the Method section above for the exact expression). For high-stakes financial, medical, or legal decisions, confirm the result with a professional or an authoritative source before relying on it.
Can I embed Credit Card Payoff Calculator on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of Credit Card Payoff Calculator to your own blog post or page.