Debt Payoff Calculator
Free debt payoff calculator with extra-payment what-if. See your debt-free date and total interest paid, plus how much sooner you'd be free if you added an extra payment each month.
💳 Multi-Debt Manager
Add every card, loan, and student debt. See the full picture.
⚖️ Snowball vs Avalanche
Same total payment, two strategies. We'll tell you which saves more.
📅 Debt Freedom Timeline
Visual payoff timeline using the recommended (avalanche) strategy.
Try the mobile app
Debt-Free Plan for Android — multi-debt avalanche/snowball, monthly progress, payoff date.
How to Use This Debt Calculator
- Enter your current total debt and the APR (interest rate). Use the highest-rate debt first for the biggest impact.
- Enter your normal monthly payment. The calculator will reject any payment too small to cover monthly interest.
- Set an "extra" amount to compare. Even $50–100 extra typically shaves years off and saves thousands.
How Debt Payoff Is Calculated
Each month the calculator walks one period of amortization: add interest, subtract the payment, see what's left. It repeats until the balance hits zero, counting months and total interest along the way.
new balance = balance + monthly interest − payment
repeat until balance ≤ 0
If the payment is smaller than the monthly interest, the balance grows forever — the calculator catches this and warns you to increase the payment.
Why the minimum payment is the trap
The reason debt feels stuck is that minimum payments are designed to keep you paying for as long as possible. On a credit card, most of a minimum payment goes to interest, so the balance barely moves and the payoff stretches over years. The single most powerful lever you have is a fixed extra amount each month — because it attacks the principal directly, even a small overpayment can cut both the time to debt-free and the total interest sharply. This calculator shows exactly how much.
If you're juggling several debts, the order you tackle them in matters too. Paying the highest interest rate first (the "avalanche") saves the most money; clearing the smallest balance first (the "snowball") gives quicker wins and momentum. Both work — the best one is the one you'll actually stick to.
Money stress came up in IT support far more often than you'd expect — usually a colleague with a couple of credit cards quietly running on minimum payments. What struck me was that almost nobody had ever seen the actual timeline. When someone finally put their balance, rate and payment into a calculator and realised "minimum only" meant a decade and a small fortune in interest, it landed harder than any advice could. The ones who then committed to a fixed extra payment — even a modest one — and picked an order to clear the cards usually had a real plan within an afternoon. I'm not a financial adviser; I just watched the number do the convincing.
— Hill, 20 years in IT supportThis is an estimate to help you plan, not financial advice. If debt feels unmanageable, a non-profit credit counsellor or a qualified financial adviser can help you find the right approach.
Frequently Asked Questions
Should I pay off debt or invest?
Compare interest rates. Credit-card debt at 18–25% almost always beats expected stock returns of 7–10%. Mortgage debt at 3–4% may not. Pay down anything above 6–7% before investing extra.
What is the avalanche vs snowball method?
Avalanche: pay highest interest rate first — mathematically optimal. Snowball: pay smallest balance first — emotionally rewarding because debts disappear faster. Pick the one you'll actually stick with.
How much extra should I pay?
Even $50–100 extra per month dramatically shortens credit-card payoff and saves thousands in interest. Try a few scenarios in the calculator to see the impact.
Why does paying only the minimum take so long?
Because most of a minimum payment goes toward interest rather than the balance, especially on credit cards. The principal shrinks slowly, so the payoff can stretch over many years. Adding a fixed extra amount each month attacks the principal directly and shortens the timeline dramatically — try it above.