Debt Snowball vs. Avalanche Calculator

If you're carrying more than one debt, the order you pay them off in changes both how fast you're debt-free and how much interest you pay along the way — even if your total monthly payment never changes. This calculator runs both popular payoff strategies side by side, on your actual debts, so you can see the real difference instead of just taking a rule of thumb on faith.

Avalanche targets your highest-interest-rate debt first; snowball targets your smallest balance first. Both use the same underlying trick: once a debt is gone, its minimum payment doesn't disappear — it rolls into the extra payment aimed at your next target, so the payoff accelerates the further you get.

How does this calculator work?

List each debt with its balance, interest rate, and minimum payment, plus any extra amount you can put toward debt each month beyond the minimums. The calculator simulates paying every debt's minimum each month, then throws the extra payment (plus the minimums of any already-paid-off debts) at whichever debt is next in priority order. If credit cards make up most of what you owe, the Credit Card Payoff Calculator goes deeper on that single debt.

Avalanche orders debts by interest rate, highest first, provably the fastest way to minimize total interest paid, since every dollar of extra payment is attacking the balance that's costing you the most. Snowball orders by balance, smallest first, mathematically it can only tie or lose to avalanche on total interest, but paying off a full balance quickly is a real motivational win for a lot of people, and that matters too.

Both strategies are computed and shown side by side, along with the exact order and month each debt gets eliminated, so you can weigh the interest savings against which order you're actually more likely to stick with. The Budget Calculator can help you find extra money to put toward whichever strategy you pick.

Worked example

A $2,000 personal loan at 8%, a $9,000 credit card at 25%, and a $1,000 store card at 15%, with $200/month extra beyond the minimums.

Avalanche order

Credit Card (25%) → Store Card (15%) → Personal Loan (8%)

Snowball order

Store Card ($1,000) → Personal Loan ($2,000) → Credit Card ($9,000)

Avalanche result

debt-free in 31 months, ≈$3,543 total interest

Snowball result

debt-free in 33 months, ≈$4,401 total interest — about $859 more

How the numbers work

Avalanche attacks the $9,000 credit card at 25% right away, even though it's the largest balance — every extra dollar goes toward the debt costing the most, which is why it finishes with less total interest.

Snowball clears the two smaller debts first for quick wins, but leaves the expensive $9,000 balance accruing interest at 25% the longest — the trade-off for the psychological benefit of fast early progress. Getting debt-free is only one input into your overall financial picture — see how it fits with the Net Worth Calculator.

When a large balance also carries the highest rate, like the credit card here, avalanche's advantage gets meaningfully larger — almost $860 in this example — because that expensive debt sits and compounds the longest under snowball's smallest-first ordering. If you own a home, a Home Equity Loan or HELOC is sometimes used carefully to consolidate high-rate debt — worth comparing against a payoff-strategy-only approach first.