Debt Avalanche vs Snowball Calculator
Compare the debt avalanche and snowball payoff strategies side by side — total interest, time to debt-free, for each.
TL;DR: Debt Avalanche vs Snowball Calculator is a free, browser-based tool that lets you compare the debt avalanche and snowball payoff strategies side by side — total interest, time to debt-free, for each.
About this tool
Compare the two most common debt payoff strategies — avalanche and snowball — using your own list of debts. The avalanche method pays extra toward whichever debt has the highest interest rate first; the snowball method pays extra toward whichever debt has the smallest balance first. Both keep making at least the minimum payment on every debt — they only differ in which debt gets the leftover money each month. This tool runs a real month-by-month simulation of both strategies on your numbers, rather than a single formula, since which debt gets paid off when genuinely depends on the order chosen.
Key Features
- Add any number of debts with balance, APR, and minimum payment
- Runs a full month-by-month payoff simulation for both strategies
- Shows total interest paid and months to debt-free for each
- Highlights which strategy saves more money on your specific numbers
- Flags debts whose minimum payment won't cover accruing interest
- Nothing is uploaded — the simulation runs entirely in your browser
How to Use
- Enter each debt's balance, interest rate, and minimum monthly payment.
- Enter how much extra you can put toward debt each month, beyond the minimums.
- Click Compare strategies.
- Compare total interest and payoff time for avalanche vs. snowball.
When to use it
- Deciding which order to pay off multiple credit cards or loans
- Checking exactly how much the avalanche method would actually save you in dollars, not just in principle
- Seeing whether the snowball method's psychological-win order costs you much extra interest for your specific balances
- Testing how a larger or smaller extra monthly payment changes the payoff timeline
- Building a concrete payoff plan before consolidating or negotiating with lenders
Tips & limitations
- Avalanche minimizes total interest paid — mathematically it's never worse than snowball, and is often meaningfully better when rates differ a lot between debts
- Snowball pays off individual debts sooner (since it targets the smallest balance first), which some people find easier to stick with even though it usually costs somewhat more in total interest
- If a debt's minimum payment doesn't cover the interest accruing on it that month, the balance won't shrink at all under either strategy until more than the minimum is paid — this tool flags that case explicitly
- This assumes rates stay fixed and payments are made on schedule every month; a real payoff will vary if rates change or a payment is missed
Avalanche vs. snowball, side by side
| Method | Extra payment goes to | Total interest | Best for |
|---|---|---|---|
| Debt avalanche | Highest interest rate debt first | Lowest possible | Minimizing total cost — the mathematically optimal choice |
| Debt snowball | Smallest balance first | Usually somewhat higher | Staying motivated — debts disappear faster, which some people find easier to sustain |
Both methods make at least the minimum payment on every debt every month — neither ever skips a minimum. They only disagree on where the leftover "extra" money goes.
Frequently Asked Questions
- Avalanche always results in equal or lower total interest than snowball, since it targets the highest-rate debt first — mathematically it's the more efficient choice. Snowball can still be the better real-world choice for someone who needs the motivation of seeing individual debts disappear quickly to stay consistent with payments.
- Not necessarily — they're usually close, but the exact payoff month can differ slightly, since the order debts are paid off in changes how quickly minimum payments free up to become part of the extra payment pool.
- That debt's balance won't shrink — it may even grow — until it receives more than the minimum. This tool flags that situation directly rather than showing a misleading payoff date.
- No — it assumes each debt's APR stays fixed for the full simulation. Many cards and loans do have fixed or promotional-then-fixed rates, but if a rate is variable, treat the result as an estimate based on today's rate.
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