Debt Payoff Calculator
How long to clear a balance at a fixed monthly payment
Use this when you need a fast, accurate result — no sign-up, works entirely in your browser.
Months to payoff—
Years to payoff—
Total interest paid—
Total amount paid—
How to Use
- Enter your details into the fields above.
- Click the calculate button to get your result instantly.
- Use the clear button to start a new calculation.
Example
- $15,000 balance, 18% APR, $400/mo → 56 months (4.7 years); total interest $7,400.00; total paid $22,400.00
- $12,000 balance, 18% APR, $400/mo → Paid off in 41 months (3.4 yr); interest ≈ $4,400
Formula
Months = −ln(1 − Br/M) / ln(1+r), where B = balance, r = APR/12, M = monthly payment. If M ≤ B × r the payment never covers the interest and the debt grows — the tool reports "Never" in that case.
About Debt Payoff Calculator
How long to clear a balance at a fixed monthly payment. This free online tool gives you fast, accurate results without registration or downloads.
Everything runs locally in your browser, so your data is never uploaded or stored — privacy first.
Frequently Asked Questions
Is this tool free to use? +
Yes, it is completely free with no registration or download required.
Is my data private? +
Yes. Everything is processed locally in your browser. Nothing is uploaded or stored on our servers.
Does it work on mobile? +
Yes, it works on any device — phone, tablet, or desktop.