Credit Card Payoff Calculator

Use our Credit Card Payoff Calculator to determine the repayment schedule to pay off your credit card debt efficiently.

Credit Card Details

Advanced Settings (Currency & Frequency)
# Total Payment Interest Principal Extra Balance
Displaying the first 360 rows. Download CSV for the full schedule.

How to Use This Calculator

Enter your current balance, annual interest rate, and the amount you plan to pay per period. Optionally add an extra contribution to principal to see how much faster you can retire the debt. Use advanced settings to switch currencies or change payment frequency (monthly, bi-weekly, or weekly) to match how you actually pay.

This tool simulates the amortization path of a fixed payment schedule, showing how each contribution reduces the balance and how much you pay toward interest.

Methodology

The calculator accrues interest every period, applies your payment plus any extra toward interest first, and then toward principal. When the balance is nearly zero, the final payment is trimmed so you do not pay more than required. Results and the amortization table are estimates based on the inputs you provide.

  • The periodic payment is preserved across the schedule; extra principal accelerates payoff.
  • Payment frequency determines the number of periods per year and the periodic interest rate.
  • Monthly equivalent figures make it easy to compare different frequencies.
These numbers are for planning only; they reflect standard formulas rather than your lender’s account statements. Consider rounding up your payment to stay ahead of interest and fees.

Full original guide (expanded)

Credit card debt can take longer to extinguish than you expect because the first payments mainly cover interest. This calculator makes the amortization path visible so you can decide whether a payoff boost or balance transfer makes sense.

Glossary of Terms

  • Current Balance: The total amount you owe on the credit card.
  • Annual Interest Rate: The yearly interest rate charged on your balance.
  • Periodic Payment: The amount you contribute each period (per month, bi-weekly, or weekly).

Frequently Asked Questions

How does the credit card payoff calculator work? The calculator estimates the time required to pay off debt using your balance, interest rate, and planned payment schedule.

Why is it important to pay off credit card debt? Eliminating credit card debt improves your credit score and frees up money for savings and investments.

Can I use this calculator for multiple cards? Yes. Run the calculator for each card individually—adjust the balance and terms as needed to compare payoff timelines.

Formulas

Months to Payoff:

-log(1 - (Balance × Interest Rate / (12 × Monthly Payment))) / log(1 + Interest Rate / 12)

Interest rate is annual percentage: divide by 12 (or the number of periods per year) before computing the periodic payment.

Citations

CFPB — Credit cards (consumer education) — consumerfinance.gov · Accessed 2026-01-19
https://www.consumerfinance.gov/consumer-tools/credit-cards/

FTC — Credit and loans (consumer advice) — consumer.ftc.gov · Accessed 2026-01-19
https://consumer.ftc.gov/

Federal Reserve — Consumer resources — federalreserve.gov · Accessed 2026-01-19
https://www.federalreserve.gov/consumerscommunities.htm

Changelog

Version 0.1.0-draft · 2026-01-19

  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
✓ Verified by Ugo Candido Last Updated: 2026-01-19 Version 0.1.0-draft
Version 1.5.0
) + round2(safe).toFixed(2); } }; const humanizeDuration = (payments, freq) => { const years = payments / freq; const wholeYears = Math.floor(years); const remMonths = Math.round((years - wholeYears) * 12); if (wholeYears <= 0) return `${Math.max(1, remMonths)} months`; if (remMonths <= 0) return `${wholeYears} years`; return `${wholeYears} yrs ${remMonths} mos`; }; const els = { balance: document.getElementById('balance'), interestRate: document.getElementById('interestRate'), monthlyPayment: document.getElementById('monthlyPayment'), extraPayment: document.getElementById('extraPayment'), currency: document.getElementById('currency'), paymentsPerYear: document.getElementById('paymentsPerYear'), totalMonthly: document.getElementById('totalMonthly'), basePayment: document.getElementById('basePayment'), extraPaymentResult: document.getElementById('extraPaymentResult'), totalInterest: document.getElementById('totalInterest'), payoffLabel: document.getElementById('payoffLabel'), payoffMonths: document.getElementById('payoffMonths'), totalPaid: document.getElementById('totalPaid'), errorBox: document.getElementById('errorBox'), scheduleWrap: document.getElementById('scheduleWrap'), scheduleBody: document.getElementById('scheduleBody'), toggleSchedule: document.getElementById('toggleSchedule'), downloadCsv: document.getElementById('downloadCsv'), calcBtn: document.getElementById('calcBtn'), resetBtn: document.getElementById('resetBtn') }; const DEFAULTS = { balance: 5000, interestRate: 18, monthlyPayment: 200, extraPayment: 0, currency: 'USD', paymentsPerYear: 12 }; let currentSchedule = []; function parseInputs() { return { balance: parseFloat(els.balance.value), annualRatePct: parseFloat(els.interestRate.value), paymentPerPeriod: parseFloat(els.monthlyPayment.value), extraPayment: parseFloat(els.extraPayment.value) || 0, currency: els.currency.value, paymentsPerYear: parseInt(els.paymentsPerYear.value, 10) }; } function validate(inputs) { const errors = []; const allowedFreq = new Set([12, 26, 52]); if (!Number.isFinite(inputs.balance) || inputs.balance <= 0) { errors.push('Balance must be greater than 0.'); } if (!Number.isFinite(inputs.annualRatePct) || inputs.annualRatePct < 0) { errors.push('Interest rate must be 0 or greater.'); } if (!Number.isFinite(inputs.paymentPerPeriod) || inputs.paymentPerPeriod <= 0) { errors.push('Periodic payment must be greater than 0.'); } if (!Number.isFinite(inputs.extraPayment) || inputs.extraPayment < 0) { errors.push('Extra payment must be 0 or greater.'); } if (!allowedFreq.has(inputs.paymentsPerYear)) { errors.push('Payment frequency is invalid.'); } return { ok: errors.length === 0, errors }; } function compute(inputs) { const schedule = []; let balance = inputs.balance; const ratePerPeriod = inputs.annualRatePct > 0 ? inputs.annualRatePct / 100 / inputs.paymentsPerYear : 0; const maxPeriods = 5000; let iterations = 0; let totalInterest = 0; const periodicPayment = inputs.paymentPerPeriod; const extra = inputs.extraPayment; if (ratePerPeriod > 0 && periodicPayment <= balance * ratePerPeriod) { return null; } while (balance > 0.005 && iterations < maxPeriods) { const interest = balance * ratePerPeriod; let principal = periodicPayment - interest; if (principal + extra <= 0) { return null; } let extraApplied = extra; if (principal + extraApplied > balance) { extraApplied = Math.max(0, balance - principal); principal = Math.min(principal, balance); } let totalPayment = periodicPayment + extraApplied; if (balance + interest < totalPayment) { totalPayment = balance + interest; const excess = totalPayment - (periodicPayment + extraApplied); extraApplied = Math.max(0, extraApplied + excess); } balance = Math.max(0, balance - principal - extraApplied); totalInterest += interest; iterations += 1; schedule.push({ num: iterations, total: round2(totalPayment), interest: round2(interest), principal: round2(principal), extra: round2(extraApplied), balance: round2(balance) }); } if (iterations === 0 || iterations >= maxPeriods) { return null; } const totalPaid = schedule.reduce((sum, row) => sum + row.total, 0); return { schedule, totalInterest: round2(totalInterest), totalPaid: round2(totalPaid), periodicPayment: round2(periodicPayment), extraPayment: round2(extra) }; } function renderError(errors) { if (!errors.length) { els.errorBox.style.display = 'none'; els.errorBox.textContent = ''; return; } els.errorBox.style.display = 'block'; els.errorBox.textContent = errors.join(' '); } function formatOutputs(result, inputs) { const monthlyEquivalent = (inputs.paymentPerPeriod + inputs.extraPayment) * (inputs.paymentsPerYear / 12); return { totalMonthly: formatCurrency(monthlyEquivalent, inputs.currency), basePayment: formatCurrency(result.periodicPayment, inputs.currency), extraPayment: formatCurrency(result.extraPayment, inputs.currency), totalInterest: formatCurrency(result.totalInterest, inputs.currency), totalPaid: formatCurrency(result.totalPaid, inputs.currency), payoffMonths: result.schedule.length, payoffLabel: humanizeDuration(result.schedule.length, inputs.paymentsPerYear) }; } function renderTable(currency) { els.scheduleBody.innerHTML = ''; const frag = document.createDocumentFragment(); const rows = currentSchedule.slice(0, 360); for (const row of rows) { const tr = document.createElement('tr'); tr.innerHTML = ` ${row.num} ${formatCurrency(row.total, currency)} ${formatCurrency(row.interest, currency)} ${formatCurrency(row.principal, currency)} ${formatCurrency(row.extra, currency)} ${formatCurrency(row.balance, currency)} `; frag.appendChild(tr); } els.scheduleBody.appendChild(frag); } function render(formatted, errors) { renderError(errors); if (errors.length) { els.downloadCsv.disabled = true; return; } els.totalMonthly.textContent = formatted.totalMonthly; els.basePayment.textContent = formatted.basePayment; els.extraPaymentResult.textContent = formatted.extraPayment; els.totalInterest.textContent = formatted.totalInterest; els.totalPaid.textContent = formatted.totalPaid; els.payoffMonths.textContent = formatted.payoffMonths; els.payoffLabel.textContent = formatted.payoffLabel; els.downloadCsv.disabled = false; if (els.scheduleWrap.style.display === 'block') { renderTable(els.currency.value); } } function update() { const inputs = parseInputs(); const validation = validate(inputs); if (!validation.ok) { render({}, validation.errors); return; } const result = compute(inputs); if (!result) { render({}, ['Calculation failed for the current inputs. Please revise values.']); return; } currentSchedule = result.schedule; const formatted = formatOutputs(result, inputs); render(formatted, []); } function reset() { els.balance.value = DEFAULTS.balance; els.interestRate.value = DEFAULTS.interestRate; els.monthlyPayment.value = DEFAULTS.monthlyPayment; els.extraPayment.value = DEFAULTS.extraPayment; els.currency.value = DEFAULTS.currency; els.paymentsPerYear.value = DEFAULTS.paymentsPerYear; const debouncedUpdate = debounce(update, 100); document.querySelectorAll('#inputsCard input, #inputsCard select, #inputsCard textarea') .forEach((el) => { el.addEventListener('input', debouncedUpdate); el.addEventListener('change', debouncedUpdate); }); update(); } const debouncedUpdate = (() => { let timer; return () => { clearTimeout(timer); timer = setTimeout(update, 100); }; })(); const inputs = input.addEventListener('change', debouncedUpdate); }); els.calcBtn.addEventListener('click', update); els.resetBtn.addEventListener('click', reset); els.toggleSchedule.addEventListener('click', () => { const isHidden = els.scheduleWrap.style.display !== 'block'; els.scheduleWrap.style.display = isHidden ? 'block' : 'none'; els.toggleSchedule.textContent = isHidden ? 'Hide Amortization Schedule' : 'View Amortization Schedule'; if (isHidden) { renderTable(els.currency.value); } }); els.downloadCsv.addEventListener('click', () => { if (currentSchedule.length === 0) return; const currency = els.currency.value; let csv = '#,Total Payment,Interest,Principal,Extra,Balance\n'; for (const row of currentSchedule) { csv += `${row.num},${row.total},${row.interest},${row.principal},${row.extra},${row.balance}\n`; } const blob = new Blob([csv], { type: 'text/csv' }); const url = URL.createObjectURL(blob); const anchor = document.createElement('a'); anchor.href = url; anchor.download = 'credit-card-payoff-schedule.csv'; anchor.click(); URL.revokeObjectURL(url); }); update(); })();