Debt Avalanche Calculator

Use this free debt avalanche calculator to estimate how long it may take to pay off multiple debts by focusing extra money on the highest-interest debt first.

Enter each debt balance, interest rate, required monthly payment, and any extra amount you can put toward debt. The calculator will estimate your payoff order, total interest, total amount paid, and how extra payments may change your timeline.

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What Is the Debt Avalanche Method?

The debt avalanche method focuses on paying off your highest-interest debt first.

You continue making the required payments on all of your debts, but any extra money goes toward the debt with the highest annual percentage rate, or APR.

Once that debt is paid off, the money that had been going toward it is redirected to the debt with the next-highest interest rate.

The process continues until all debts are paid off.

The goal is to reduce the amount of interest that accumulates over time.

How to Use the Debt Avalanche Calculator

Enter each debt you want to include.

For every debt, enter:

• Debt name
• Current balance
• Annual interest rate
• Required monthly payment

Then enter any extra monthly amount you want to put toward your debts.

The calculator will estimate:

• Your debt avalanche payoff order
• Estimated payoff time
• Estimated total interest
• Estimated total amount paid
• Estimated payoff timing for each debt
• Interest paid on each debt
• Your total starting monthly debt-payment budget
• How larger extra payments may affect your payoff timeline

You can add up to 10 debts.

How the Debt Avalanche Works

Suppose you have three debts:

Debt	Balance	APR	Required Payment
Credit Card A	$2,000	22%	$100
Personal Loan	$5,000	9%	$150
Credit Card B	$7,000	18%	$200

Your required monthly payments total:

$450

If you also have:

$200 extra per month

your starting debt-payment budget would be:

$650 per month

The avalanche method would focus extra money on the debt with the highest APR first:

1. Credit Card A at 22%

2. Credit Card B at 18%

3. Personal Loan at 9%

You would continue making the required payments on all three debts.

Any money left after those required payments would go toward Credit Card A.

Once Credit Card A is paid off, that money stays in your monthly debt budget and is redirected toward Credit Card B.

After Credit Card B is gone, the remaining debt-payment budget can be directed toward the Personal Loan.

Why Start With the Highest Interest Rate?

Interest makes debt more expensive over time.

The higher the interest rate, the faster interest can accumulate on an unpaid balance.

By targeting the highest-interest debt first, the avalanche method is designed to reduce exposure to the most expensive debt as quickly as possible.

If two debts have the same APR, this calculator prioritizes the smaller balance first.

Debt Avalanche vs. Debt Snowball

The two strategies use different priorities.

Debt Avalanche

Pays debts from the highest interest rate to the lowest interest rate.

The main focus is:

Reducing estimated interest costs

Debt Snowball

Pays debts from the smallest balance to the largest balance.

The main focus is:

Quick wins and visible progress

For example, suppose you have:

Debt A: $1,000 at 8%

Debt B: $5,000 at 24%

The avalanche method would target Debt B first because it has the higher interest rate.

The snowball method would target Debt A first because it has the smaller balance.

Which Method Usually Saves More Interest?

If the same total monthly payment is used, the debt avalanche method will generally produce lower interest costs than prioritizing lower-interest debt first.

That is because more money is directed toward the most expensive debt.

However, the difference depends on:

• Debt balances
• Interest rates
• Required payments
• Extra payments
• How long each balance remains outstanding

In some situations, the difference between snowball and avalanche results may be relatively small.

In others, especially when interest rates vary significantly, the difference may be larger.

Is the Debt Avalanche Always Faster?

Not necessarily in every comparison, although it often performs very efficiently.

Payoff time depends on the entire set of balances, required payments, interest rates, and the total amount paid each month.

The biggest mathematical advantage of the avalanche strategy is usually its focus on reducing interest costs.

What Happens After the Highest-Interest Debt Is Paid Off?

The money being used for that debt is not removed from the plan.

It is redirected toward the next debt.

For example, suppose your monthly debt budget is:

$800

After your highest-interest debt is eliminated, you continue putting approximately the same overall $800 toward the debts that remain.

This is what allows the payment amount directed toward each target debt to grow over time.

What Is the Starting Monthly Debt Budget?

The calculator adds together all required monthly debt payments and your extra monthly payment.

For example:

Required debt payments: $650

Extra payment: $250

Starting monthly debt budget:

$900

The calculator attempts to keep that overall payment budget working toward debt as balances are eliminated.

What Counts as an Extra Payment?

An extra payment is money you can put toward debt beyond the required monthly payments.

Examples may include:

• An additional $50 per month
• An additional $100 per month
• Money freed by reducing another expense
• Part of a raise
• Additional employment income
• Freelance income
• A recurring amount from your monthly budget

The calculator assumes the extra amount is available consistently each month.

How Much Can Extra Payments Help?

Additional payments reduce principal faster.

That can reduce both:

• Payoff time
• Interest charged

The calculator includes comparison scenarios using:

• Your current extra payment
• $100 more per month
• $250 more per month
• $500 more per month

This makes it easier to compare different payoff approaches.

What If I Cannot Make an Extra Payment?

Enter:

$0

as your extra monthly payment.

The calculator will still estimate an avalanche plan using the required monthly payments you entered.

Adding extra money is not required for the strategy to work, although larger payments may reduce the payoff timeline.

How Is Interest Calculated?

The calculator converts each APR into an estimated monthly interest rate.

A simplified calculation is:

Monthly Interest Rate = APR ÷ 12

For example, an APR of:

24%

corresponds to an estimated monthly rate of:

2%

If the balance is:

$5,000

the estimated interest for the first month would be approximately:

$100

before payments are applied.

Actual lenders may calculate interest daily or use other methods, so actual charges can differ.

Why High-Interest Debt Can Be Expensive

Suppose two debts both have a balance of:

$5,000

Debt A has:

6% APR

Debt B has:

24% APR

Ignoring payment timing and compounding differences, Debt B can generate substantially more interest than Debt A.

That is why the avalanche method gives higher-interest balances priority.

What If Two Debts Have the Same Interest Rate?

If two debts have the same APR, the calculator prioritizes the smaller starting balance.

For example:

Debt A: $2,000 at 18%

Debt B: $4,000 at 18%

Debt A would be targeted first.

If both the APR and balance are the same, the calculator keeps them in the order they were entered.

What If a Payment Is Too Low?

A debt payment needs to be high enough to eventually reduce the balance.

If monthly interest is consuming most or all of the available payment, a balance can decrease very slowly or potentially grow.

If the calculator cannot repay all entered debts within its 100-year calculation limit, it will show a warning.

This does not mean you are literally expected to remain in debt for 100 years.

It means the payment structure you entered is not producing a reasonable payoff within the calculator’s limit.

Should I Enter Minimum Payments?

Enter the required monthly payment you expect to make on each debt.

This could be the lender’s current minimum payment or another fixed monthly amount you have chosen.

Some lenders recalculate minimum payments as balances change.

This calculator does not attempt to duplicate every lender’s payment formula.

Instead, it treats the required payment amount you enter as part of a fixed monthly debt-payment budget.

Does the Calculator Reduce Payments as Debts Shrink?

No.

The strategy assumes you maintain the overall debt-payment budget.

If one debt is paid off, that freed payment becomes available for another debt.

This is important because reducing your overall debt payment every time a balance disappears would slow the payoff process.

What If My Credit Card Minimum Payment Changes?

Credit card minimum payments often change as balances decline.

The calculator does not automatically recalculate lender minimum-payment formulas.

It uses the monthly payment amount you enter.

Actual credit card statements may therefore produce different payment requirements.

Should I Include 0% Interest Debt?

You can.

Enter:

0% APR

for that debt.

Because the avalanche strategy prioritizes the highest interest rate, a 0% debt would generally be paid after debts with positive interest rates.

However, temporary promotional rates may expire.

If a 0% promotional period is ending soon, the future interest rate could affect how you personally choose to prioritize that debt.

What About Promotional Credit Card Rates?

The calculator assumes the APR you enter remains unchanged throughout the estimate.

It does not automatically model:

• Introductory 0% APR periods
• Balance-transfer promotions
• Deferred interest
• Rate increases
• Penalty APRs

If a promotional rate will change, consider running more than one scenario.

Should I Include My Mortgage?

You can enter a mortgage, but many people use avalanche strategies primarily for consumer debts such as:

• Credit cards
• Personal loans
• Lines of credit
• Student loans
• Vehicle loans
• Medical debts

Mortgages often have longer terms and may involve different prepayment rules, penalties, taxes, or other considerations.

Should I Include Student Loans?

You can include student loans.

However, government or private student loans may have special features such as:

• Repayment assistance
• Interest subsidies
• Tax considerations
• Forgiveness programs
• Income-based payment options

Those factors are not modeled by this calculator.

Should I Include a Car Loan?

Yes, if the car loan is part of the debt payoff plan you want to analyze.

Enter the remaining balance, APR, and required payment just like any other debt.

Check your loan agreement before making additional payments because some loans may have restrictions or specific payment allocation rules.

What If I Keep Adding New Credit Card Purchases?

The calculator assumes no new debt is added.

Continuing to make purchases on a card while paying it down can increase the actual payoff time and interest.

For the estimate to be useful, treat the balances as if no new charges are being added.

Debt Avalanche Example

Suppose you have four debts:

Debt	Balance	APR	Payment
Credit Card	$4,000	24%	$150
Store Card	$1,500	19%	$75
Car Loan	$9,000	7%	$300
Student Loan	$12,000	5%	$180

Total required payments:

$705 per month

Extra payment:

$250 per month

Starting monthly debt budget:

$955 per month

The avalanche order would be:

1. Credit Card at 24%

2. Store Card at 19%

3. Car Loan at 7%

4. Student Loan at 5%

Once the Credit Card is paid off, the money previously directed toward it becomes available for the Store Card.

The process continues until all debts are eliminated.

Can I Change the Avalanche Order?

The standard debt avalanche method uses highest interest rate first.

This calculator automatically follows that rule.

You may choose a different order because of:

• Promotional rates
• Secured debt
• Family loans
• Tax considerations
• Loan penalties
• Accounts in collections
• Personal priorities

If you want to prioritize smaller balances instead, use the Debt Snowball Calculator.

What If My Highest-Interest Debt Has the Largest Balance?

The avalanche method will still target it first.

This can mean it takes longer before the first account is completely eliminated.

That is one of the main psychological differences between avalanche and snowball.

The avalanche method emphasizes mathematical interest savings rather than the speed of the first account payoff.

Can the Avalanche Method Feel Slower?

It can.

If your highest-interest debt also has a large balance, you may spend a longer period working on the first target before an account disappears.

Some people find that less motivating than quickly eliminating a small balance.

Others prefer knowing that they are targeting the most expensive debt.

Does the Debt Avalanche Require Perfect Discipline?

No budgeting method requires perfection.

However, the strategy works best when:

• Required payments are made consistently
• Extra payments are maintained
• New debt is limited
• Freed payments are redirected instead of spent elsewhere

If your available payment changes, you can rerun the calculator using the new amount.

What Happens After All Debts Are Paid Off?

The monthly amount previously used for debt can become available for other priorities.

Depending on your situation, that may include:

• Building an emergency fund
• Saving for large purchases
• Retirement contributions
• Investing
• Home improvements
• Other financial goals

The Savings Goal Calculator and Emergency Fund Calculator can help estimate those next steps.

Calculator Assumptions

This calculator assumes:

• No new debt is added
• All required payments remain available
• The extra monthly payment remains consistent
• Freed payments are redirected to the next avalanche target
• Debts are prioritized by APR
• Smaller balance is used as the tie-breaker when APRs are equal
• Interest rates remain unchanged
• Interest is estimated monthly
• Required payment amounts remain fixed
• No late fees are added
• No annual fees are added
• Promotional rate changes are not modeled
• No missed payments occur
• Lender-specific minimum-payment formulas are not modeled
• Final payments may be smaller than regular monthly payments
• Results are estimates rather than lender payoff quotes

Frequently Asked Questions

What debt is paid first with the avalanche method?

The debt with the highest APR is targeted first.

Once it is paid off, extra money is redirected toward the debt with the next-highest APR.

What happens if two debts have the same APR?

The calculator prioritizes the debt with the smaller balance.

Does the debt avalanche save money?

It is designed to reduce interest by prioritizing the highest-interest debt first.

Actual savings depend on your balances, rates, payments, and repayment timeline.

Is avalanche better than snowball?

Not necessarily for every person.

Avalanche prioritizes interest savings.

Snowball prioritizes paying off smaller balances first.

Which method is mathematically better?

When all other factors are equal, directing extra money toward the highest-interest debt generally minimizes interest costs.

However, the most useful strategy is one you can realistically maintain.

Can I include multiple credit cards?

Yes.

Enter each card separately with its own balance, APR, and monthly payment.

How many debts can I enter?

You can enter up to 10 debts.

Can I use the calculator without an extra payment?

Yes.

Enter $0 for the extra monthly payment.

Does the calculator account for daily compounding?

No.

It uses a simplified monthly interest calculation based on the APR entered.

Will my lender’s payoff amount match the calculator exactly?

Probably not.

Lenders may use daily interest, specific payment dates, fees, minimum-payment formulas, and other account rules.

Use lender payoff quotes when you need exact amounts.

Does Budget & Freedom store my debt information?

No.

The calculations happen in your browser and do not require an account or login.

Related Tools

Use the Debt Snowball Calculator to compare a smallest-balance-first payoff strategy.

Use the Debt Snowball Calculator

Use the Debt Payoff Calculator to estimate payoff time for an individual debt.

Use the Debt Payoff Calculator

Use the Credit Card Payoff Calculator for credit-card-specific payoff estimates.

Use the Credit Card Payoff Calculator

Use the Monthly Budget Calculator to look for room in your monthly budget for extra debt payments.

Use the Monthly Budget Calculator

Use the Net Worth Calculator to compare your assets and liabilities.

Use the Net Worth Calculator

Financial Disclaimer

Budget & Freedom provides calculators and educational information for general informational purposes only.

Calculator results are estimates based on the information entered and should not be considered personalized financial, debt, credit, investment, tax, accounting, or legal advice.

Actual lender calculations, interest charges, minimum payments, fees, payment allocation rules, promotional rates, and payoff amounts may differ.

Always review your lender statements and loan agreements when making debt repayment decisions.

By Laura Bennett