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Debt Payoff Calculator

Compare debt avalanche and debt snowball payoff timelines with monthly interest, minimum payments, extra payments and payment rollover.

Planning estimate — no independent professional review is claimed. Check the documented method and sources before using the result for a financial decision.

Last updated August 24, 2026

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Debt Payoff Calculator

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List each balance, annual percentage rate and minimum payment, then add the extra amount you can consistently pay each month. The calculator compares two widely used approaches: highest APR first (avalanche) and smallest balance first (snowball).

The total monthly payment stays fixed until the modeled debts are cleared. When one balance reaches zero, its former payment rolls to the next target.

How It Works

Each month the model adds one month of interest to every active balance, pays every active minimum, and directs the remaining fixed budget to the strategy target. Avalanche sorts by highest APR; snowball sorts by smallest current balance. A paid-off balance releases its payment to the next target in the same month.

The projection stops if a listed minimum would not cover first-month interest. It excludes daily compounding, new charges, late fees, promotional-rate changes and creditor-specific payment allocation.

Understanding Your Results

Compare total payoff months, modeled interest and payoff order. Avalanche often minimizes interest when rates differ; snowball can produce an earlier visible payoff. The better behavioral fit is the plan you can maintain without missing minimums or adding new debt.

Before making an extra payment

Keep required minimums current, confirm how the creditor applies extra payments, and preserve enough cash for routine bills and unexpected costs. If a balance has a temporary promotional rate, run a second scenario with the future rate.

Assumptions Used

  • Interest compounds monthly
  • Total monthly payment remains fixed
  • No new charges, fees or rate changes
  • Extra funds move to the current strategy target

Pros and Considerations

Benefits

  • •Compares two payoff strategies from the same monthly budget
  • •Rolls paid-off payments to the next target
  • •Shows payoff order, months and modeled interest

Considerations

  • •Does not model daily compounding or changing minimums
  • •Assumes no new charges or fees
  • •Does not evaluate consolidation, settlement or bankruptcy options

Important Notes

  • •Continue every required minimum payment
  • •Confirm how extra payments are applied by each creditor

Warnings

  • •A missed minimum can trigger fees or credit consequences not modeled here
  • •Seek qualified help if payments are unaffordable or collections are involved

Frequently Asked Questions

What is the debt avalanche method?
It pays every minimum and directs extra money to the highest-APR debt first, then rolls that payment to the next-highest rate.
What is the debt snowball method?
It pays every minimum and directs extra money to the smallest current balance first, creating earlier account payoffs.
Does the calculator roll payments forward?
Yes. The modeled total monthly budget remains fixed, and a paid-off debt’s former minimum becomes available to the next target.
Why is my minimum payment rejected?
If the first month’s interest is at least as large as the listed minimum, the balance would not amortize under the model. Confirm the APR and minimum.
Are new purchases included?
No. The projection assumes no new charges, fees or cash advances.
Will my lender match this schedule exactly?
Not necessarily. Issuers may compound daily, change minimums or rates, and apply payments under account-specific terms.

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Related FinanceFirst Research

The State of U.S. Household Debt in 2026U.S. household debt totaled $18.794 trillion in Q1 2026, up $18 billion from the previous quarter and $591 billion from a year earlier. Credit-card balances declined seasonally to $1.252 trillion but remained $70 billion higher year over year, while 4.8% of total debt was in some stage of delinquency and the share of student-loan balances 90 or more days past due rose to 10.3%.

Terms Used in This Calculator

Debt Avalanche MethodThe debt avalanche method is a debt repayment strategy where you pay off debts in order from highest interest rate to lowest, regardless of balance size. You make minimum payments on all debts while directing all extra money toward the highest-rate debt first. This approach minimizes total interest paid and is the mathematically optimal payoff strategy.Debt Snowball MethodThe debt snowball method is a debt repayment strategy where you pay off debts in order from smallest balance to largest, regardless of interest rate. You make minimum payments on all debts except the smallest, which receives all extra payments until it is eliminated. The freed-up payment then rolls into the next smallest debt, creating a snowball effect.Interest RateAn interest rate is the percentage of a principal amount charged by a lender for the use of money, or earned by a depositor for keeping money in a savings account. Interest rates are expressed as an annual percentage and are influenced by the Federal Reserve's federal funds rate, inflation expectations, and the borrower's creditworthiness.

References

  1. CFPB, How to reduce your debt
  2. CFPB, Reducing debt worksheet
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