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Debt Payoff Calculator

Compare Avalanche vs Snowball payoff strategies, see your debt-free date, and calculate interest saved.

Formula verified by CalcPro.pro Editorial TeamLast updated May 2025

Your Debts

About This Calculator

This debt payoff calculator shows you exactly when you will be debt free, how much total interest you will pay, and how much you can save by adding extra payments. It compares two proven strategies side by side: the Avalanche method (highest interest rate first, mathematically optimal) and the Snowball method (smallest balance first, psychologically motivating). Use it to build a concrete payoff plan.

How to Use This Calculator

  1. 1Enter each debt with its current balance, annual interest rate, and minimum monthly payment
  2. 2Add your extra monthly payment amount — even $50/month makes a significant difference
  3. 3Choose your preferred payoff strategy: Avalanche saves the most money; Snowball provides faster early wins
  4. 4Click Calculate to see your payoff date, total interest, and savings vs minimum payments only

Formula Used

Monthly Interest = Balance × (Annual Rate / 12 / 100) | Avalanche: Extra payment to highest-rate debt first | Snowball: Extra payment to lowest-balance debt first

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FAQ

Frequently Asked Questions

Common questions about the debt payoff calculator answered.

What is the avalanche debt payoff method?+
The avalanche method directs your extra payment to the debt with the highest interest rate first, while paying minimums on all others. Once that debt is paid off, you roll its payment to the next highest-rate debt. This method is mathematically optimal — it minimizes total interest paid. It is ideal for people who are motivated by seeing numbers improve and who may have high-rate credit card debt alongside lower-rate loans.
What is the snowball debt payoff method?+
The snowball method pays off the smallest balance debt first, regardless of interest rate. This creates faster early wins — seeing debts disappear entirely is highly motivating for many people. Research by the Harvard Business Review found people using the snowball method were more likely to stay on track. The cost is slightly more total interest compared to the avalanche method.
How much does an extra $200/month really help?+
It depends on your balance and interest rate, but the impact is substantial. On $20,000 of credit card debt at 22% APR with $400 minimum payments, paying $600/month instead saves approximately $8,000 in interest and cuts payoff time from 9 years to 4 years. The earlier you start paying extra, the more interest you save because you reduce the principal that interest is charged on.
Should I pay off debt or invest first?+
A general rule: pay off any debt with an interest rate above 7–8% before investing in taxable accounts, since that rate exceeds long-term stock market returns. However, always capture employer 401(k) match first — that is a guaranteed 50–100% return. Below 5% interest rate debt (like a mortgage), investing may yield better long-term returns. Credit card debt at 20%+ should always be paid off aggressively before investing.
What happens to freed-up money after a debt is paid off?+
The key to debt payoff success is the debt roll-up: when a debt is paid off, take its entire payment and add it to the next debt on your list. This accelerates payoff dramatically. After all debts are cleared, redirect the entire monthly payment amount toward savings and investing. Most people who follow this approach see their savings rate jump by 15–25% of income after becoming debt free.

Average US Household Debt (2024)

The average US household carries approximately $6,501 in credit card debt (Federal Reserve 2024), plus $20,987 in auto loans and $11,017 in student loans. UK adults hold an average of £2,395 in unsecured consumer debt. Canadian and Australian households carry higher debt-to-income ratios than any OECD country. This calculator helps you build a systematic payoff plan regardless of your total debt load.

  • List all debts including credit cards, personal loans, auto loans, and student loans
  • Always pay at least the minimum on every debt to avoid penalties and credit damage
  • Avalanche method saves the most money on high-rate credit card debt
  • Even $50 extra per month makes a meaningful dent in a 2–5 year payoff timeline

Credit Card Debt: The True Cost of Minimum Payments

Paying only the minimum on a $5,000 credit card balance at 22% APR takes approximately 15 years to repay and costs over $6,100 in interest — more than the original balance. Doubling the minimum payment cuts both time and interest by roughly 70%. This compounding interest trap is why credit card debt is the highest-priority debt for almost every financial advisor, and why even small extra payments make a dramatic difference.

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