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Debt Avalanche Calculator – Pay Off High-Interest Debt First, Save the Most on Interest

Debt Avalanche Calculator
Add your debts, set your monthly budget, and instantly see which balance to hit first — with a full payoff schedule, total interest saved, and your exact debt-free date.
No data stored
Instant payoff plan
Mobile friendly
100% free
Saves maximum interest

Enter Your Debts

Debt Name Balance ($) APR %  / Min Pay
Amount above all minimum payments combined
How often interest is added to your balance
Used to show calendar debt-free date
Changes how minimum payments recalculate as balances fall

Your Debt-Free Plan

Add your debts on the left and click Calculate to get your personalized debt avalanche payoff plan.

Debt-Free In
—
months
Summary
Total Debt Now —
Total Interest Paid —
Interest Saved vs Min-Only —
Time Saved vs Min-Only —
Monthly Payment (total) —
Payoff Order (Avalanche)
# Debt Name APR Paid Off In Interest Paid

Balance vs Interest Split

Remaining Balance Over Time

How the Debt Avalanche Works

The debt avalanche is a debt elimination strategy built around one simple idea: pay off the debt charging you the most interest first. Every month, you make the minimum payment on every debt you have. Then any extra money goes straight to the balance with the highest annual percentage rate (APR).

When that balance reaches zero, you take the full payment you were making on it and add it to the minimum payment on the next highest-rate debt. This is called "rolling" your payment — it grows over time like a snowball, but you are always targeting the most expensive debt first.

The result: you pay less total interest compared to nearly any other strategy. The math always favors eliminating high-rate debt as fast as possible because those balances cost you the most each month.

How the Calculator Works

Enter each debt's name, current balance, APR, and minimum monthly payment. Then add how much extra you can put toward debt each month above the minimums. The calculator runs a month-by-month simulation:

  • Interest is calculated on each balance for the month
  • Minimum payments are applied to all debts
  • All extra money attacks the highest-APR debt
  • When one debt is paid off, its payment rolls to the next
  • This repeats until every balance is zero

The plan also shows you what paying minimums only would cost, so you can see exactly how much the avalanche approach saves you.

Avalanche vs Snowball — Which Is Better?

Factor Avalanche Snowball
Priority orderHighest APR firstSmallest balance first
Total interest paid✅ Less❌ More
Time to debt-free✅ Usually faster❌ Slightly longer
Early winsTakes longer✅ Quicker early payoffs
Best forSaving moneyStaying motivated
Maths✅ OptimalSub-optimal

Both methods work. If you need to see small wins early to stay on track, the snowball is a solid choice. If your goal is to spend the least money possible getting out of debt, the avalanche wins every time.

Tips to Speed Up Your Avalanche

Small changes to your monthly extra payment create a big difference over time. Here are practical ways to accelerate your payoff:

  • Round up payments. If your minimum is $47, pay $60 instead. That gap compounds quickly.
  • Apply windfalls. Put tax refunds, bonuses, or gifts directly on your top-rate debt.
  • Cut one recurring cost. One cancelled subscription can add $15–$50 a month to your avalanche.
  • Balance transfer. Moving a high-rate card to a 0% intro APR card can pause interest accumulation while you pay down the balance.
  • Avoid adding new debt. New balances reset your progress. Freeze cards if needed.
  • Track every payoff. When a debt hits zero, celebrate — then immediately roll that payment.

Frequently Asked Questions

The debt avalanche method means paying minimum amounts on all debts and putting every extra dollar you have toward the debt with the highest interest rate. Once that debt is gone, you roll the full payment to the next highest-rate debt. The process continues until all balances are zero. It is the most cost-efficient way to get out of debt because you eliminate the most expensive charges first.
Mathematically, yes. Because the avalanche removes the highest-APR debt first, you stop paying that expensive interest sooner. The snowball focuses on the smallest balance regardless of rate, which can leave high-APR debts running longer and costing more. In most real-world scenarios, the avalanche saves hundreds or thousands of dollars more than the snowball. That said, the snowball works better for people who need early wins to stay motivated.
Very much. Even a small extra payment makes a meaningful difference because it reduces the principal faster, which lowers the interest charged each month. A larger extra payment cuts your payoff timeline and total interest much more dramatically. Use the calculator to compare how different extra amounts affect your debt-free date — the results can be surprising.
Yes. The calculator handles any mix of debt types. Student loans, personal loans, car loans, credit cards, medical bills — just enter each one's balance, interest rate, and minimum payment. The avalanche method works the same way regardless of what type of debt it is. The one with the highest APR gets attacked first, no matter what kind it is.
When two debts have the same APR, the calculator will target the one with the smaller balance first (which is also the snowball logic in that specific case). Since both debts cost the same per dollar in interest, paying off the smaller one first frees up cash slightly faster. You could also choose either order — the difference in total cost is minimal when rates are equal.
A 0% APR balance transfer card can be a powerful tool alongside the avalanche method. Moving a high-rate balance to a 0% intro card means interest stops accumulating on that debt during the promotional period — often 12 to 21 months. You can then pour all your extra payments at it during that window. Just watch for balance transfer fees (typically 3–5%) and make sure you can pay off the balance before the intro rate expires.

Total Interest Paid by APR – $5,000 Balance, Min $100/mo

How much total interest you pay over the life of a $5,000 balance at different APRs with a fixed $100/month payment.

APR Monthly Interest (mo 1) Months to Pay Off Total Interest Total Paid

Fixed $100/mo payment. Lower APR = dramatically less interest. Even a 5% rate difference matters a lot over years.

Impact of Extra Monthly Payments – $10,000 Debt at 20% APR

How adding extra money per month changes your payoff timeline and total interest on a $10,000 balance at 20% APR.

Extra / Month Total Monthly Pay Months to Pay Off Total Interest Interest Saved vs Min

Minimum payment set at 2% of balance (initial: $200/mo). Extra payment is fixed monthly addition.

Months to Pay Off by Balance & Monthly Payment

How long it takes to eliminate debt at different balances and fixed monthly payment amounts, at 18% APR.

Balance $100/mo $150/mo $200/mo $300/mo $500/mo

At 18% APR. "—" means minimum payment does not cover monthly interest — the debt would never be paid off at this rate.

Avalanche vs Snowball – Example with 3 Debts, $300/mo Extra

Comparing total interest and payoff time for the two most popular debt elimination strategies using a common three-debt scenario.

Strategy Order Paid Total Months Total Interest Interest Saved

Example debts: Card A $3,000 at 24% APR, min $60; Card B $7,000 at 17% APR, min $140; Personal Loan $5,000 at 11% APR, min $100. Extra: $300/mo.