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Debt Payoff Calculator: Snowball vs Avalanche

Written by Calcida Team
Reviewed by Financial Review Process
Last updated: April 2026

Calculations are rooted in standard financial formulas and are provided as educational estimates only. They do not constitute professional financial advice. Results may vary based on actual interest rates and fees. You should verify all numbers with a certified financial professional prior to making significant financial commitments. Read our editorial commitment

Compare debt payoff strategies like the Debt Snowball and Debt Avalanche. See how fast you can become debt-free.

Built specifically for People paying off multiple debts who want a clear payoff timeline., this engine analyzes Debt balances, Interest rates, Minimum payments, Extra monthly payment to output debt-free date and total interest paid (snowball vs. avalanche)..

Your Debts

Payoff Strategy

Debt-Free Date

October 2028
Time Remaining30 Months
Total Interest$1,715

Balance Over Time

Strategy: Avalanche

The Avalanche method targets the highest interest rates first, minimizing the total interest you pay over time.

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How This Calculator Works

A debt payoff calculator helps you compare different strategies to see how fast you can become debt-free by applying extra payments to your loans and credit cards.

The Debt Payoff Formula:

Months to Payoff = log(PMT / (PMT - r x L)) / log(1 + r)

  • PMT = Monthly payment
  • r = Monthly interest rate
  • L = Loan amount

Example Calculation:

  • Total Debt: $10,000
  • Interest Rate: 20%
  • Monthly Payment: $500
  • Result: Debt-free in 25 Months and pay $2,226 in Interest
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Formula

Payoff uses amortization: interest accrues monthly and payments reduce principal
Interest (monthly)
Balance × (APR / 12) Description
Principal paid
Payment − Interest Description
Snowball prioritizes smallest balances; avalanche prioritizes highest APR.

Example Calculation

Debt A$5,000 at 22.9% APR
Debt B$15,000 at 5.5% APR
Extra payment$500/month
Calculated Outcome
Typical outcome
Avalanche reduces total interest; snowball can reduce accounts faster
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How to Escape Debt Faster

Debt can feel like a mountain, but it's really just a math problem. By understanding how interest works and choosing the right strategy, you can pay off your debt years faster and save thousands of dollars.

Snowball vs. Avalanche: Which is Better?

There are two main strategies for paying off multiple debts. Both require you to make the minimum payment on all debts and then throw every extra dollar at one specific debt.

The Debt Avalanche

Focus on the Highest Interest Rate first.

  • Pros: Mathematically optimal. Saves you the most money in total interest and results in the fastest overall payoff.
  • Cons: Can feel slow if your highest-interest debt is also your largest balance.

The Debt Snowball

Focus on the Smallest Balance first.

  • Pros: Psychologically rewarding. Quick wins keep you motivated and committed to the plan.
  • Cons: You will pay more in total interest over time.

How to Create Your Payoff Plan

To use the calculator above effectively, follow these steps:

  • List Your Debts: Write down every balance, interest rate, and minimum payment.
  • Find Extra Cash: Use a budget calculator to see how much extra you can pay each month.
  • Commit: Automate your payments and don't take on new debt while you're in the payoff phase.

The Power of Extra Payments

Even a small increase in your monthly payment can have a massive impact. For example, on a $10,000 credit card balance at 20% interest, paying $500 instead of $250 will save you over $5,000 in interest and cut your payoff time by 3 years.

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