Debt Payoff Calculator
Compare the debt snowball vs. avalanche payoff strategies side by side, with a full payoff timeline and interest saved. Free, no sign-up.
Once you're debt-free, put that money to work
See how it grows with our Compound Interest Calculator
Your Debts
Extra Monthly Payment
Total monthly budget: $700 ($550 minimums + $150 extra)
Snowball
Smallest balance first
5 yr 1 mo
to debt-free
$5,676
total interest paid
Avalanche
Highest interest rate first
5 yr 1 mo
to debt-free
$5,676
total interest paid
Payoff Timeline
Snowball Order
- 1. Credit Cardmo 20
- 2. Car Loanmo 37
- 3. Student Loanmo 61
Avalanche Order
- 1. Credit Cardmo 20
- 2. Car Loanmo 37
- 3. Student Loanmo 61
This calculator assumes fixed rates, no new charges, and consistent on-time payments — real accounts often have variable rates, fees, or promotional terms not reflected here. This is for general planning only, not financial advice; a nonprofit credit counselor or financial advisor can help with your specific situation.
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Buy me a coffeeFree Debt Payoff Calculator — Snowball vs. Avalanche
List out your debts, add any extra amount you can put toward them each month, and this calculator simulates two of the most popular payoff strategies side by side: the debt snowball (smallest balance first) and the debt avalanche (highest interest rate first). See exactly how long each takes, how much interest each costs, and the order your debts get paid off in — plus a full timeline chart comparing the two. Everything runs instantly in plain JavaScript, no sign-up required.
Snowball vs. Avalanche: What's the Difference?
Both methods work the same way: pay the minimum on every debt, then throw every extra dollar at one target debt until it's gone — then roll that payment into the next one. The only difference is which debt you target first.
❄️ Snowball: smallest balance first
Pays off your smallest debt first regardless of interest rate, giving you a quick win and psychological momentum — usually costs a bit more in total interest.
⛰️ Avalanche: highest rate first
Targets your most expensive debt first, which is mathematically optimal and almost always saves the most money and time overall.
Which Strategy Should You Pick?
Avalanche wins on pure math
Since it targets the highest interest rate first, avalanche almost always results in less total interest paid and a slightly faster payoff — this calculator shows you exactly how much.
Snowball wins on motivation
Clearing a small debt fast gives many people the momentum to stick with the plan — research on behavioral finance suggests this "quick win" effect genuinely helps some people stay consistent.
The gap isn't always huge
If your balances and rates are fairly similar across debts, the difference between the two methods in total interest and time is often smaller than people expect — run both here and see for yourself.
Keep making minimum payments on everything
Never skip a minimum payment on a debt you're not currently targeting — this calculator assumes all minimums are always paid, which is essential to avoid late fees and credit damage.
Extra payments matter more than the method
Whichever method you choose, the amount of extra money you put toward debt each month has a bigger impact on your payoff timeline than which debt you target first.
Frequently Asked Questions
Which method saves more money?
The avalanche method (highest interest rate first) almost always results in less total interest paid, since it eliminates your most expensive debt fastest. This calculator shows you the exact dollar difference for your specific debts.
Why would anyone choose the snowball method if it costs more?
Because personal finance is personal — clearing a small balance quickly gives many people a motivating sense of progress that helps them stick with the plan long enough to become debt-free, even if it costs a bit more in interest.
How does the extra payment get applied?
Every dollar of your extra monthly payment goes toward a single target debt (chosen by whichever method you're using) while every other debt still gets its minimum payment. Once the target debt is paid off, its minimum payment rolls into the extra amount for the next target — that's the "snowball" effect both methods share.
What if my payment isn't enough to pay off my debt?
If your total monthly budget doesn't even cover the interest accruing on your debts, the balance will never shrink and the calculator will flag this. You'll need to increase your payment or look into other options like consolidation or credit counseling.
Does this account for changing interest rates or new charges?
No — the simulation assumes fixed interest rates and no new charges on any debt, which keeps the comparison clean but won't perfectly match real-world accounts with variable rates or ongoing spending.
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