Debt Avalanche vs Snowball Calculator
Compare the avalanche (highest APR first) and snowball (lowest balance first) debt-payoff strategies across multiple cards, with total interest and payoff time. Runs in your browser.
Avalanche (highest APR first)
Snowball (lowest balance first)
Avalanche saves $109 in interest vs snowball.
Avalanche (pay highest APR first) always costs the least interest mathematically. Snowball (pay smallest balance first) can cost a little more but delivers quicker early wins that help some people stay motivated. Both pay every card's minimum, then put all spare budget on one target. Informational, not financial advice.
About this tool
When you owe on several cards, two popular strategies decide which to attack first, and this calculator simulates both side by side. Both pay the minimum on every card each month, then throw all of your remaining budget at one target. The avalanche method targets the highest-APR card first, which is mathematically optimal — it always minimizes total interest and usually time. The snowball method targets the smallest balance first, which costs a bit more interest but clears whole cards quickly, giving early psychological wins that help many people stick with the plan. Enter your cards' balances and APRs and your total monthly budget, and the tool runs a month-by-month simulation of each strategy, reporting the total interest and payoff time for both and how much avalanche saves. The honest takeaway: avalanche is cheaper, but the best plan is the one you will actually follow — if quick wins keep you going, snowball's small extra cost can be worth it. It is informational, not financial advice. Everything runs in your browser.
How to use it
- Enter each card's balance and APR.
- Set the total monthly amount you can put toward all cards combined.
- Compare the total interest and payoff time for avalanche vs snowball.
- Pick the method you'll stick with — avalanche saves the most, snowball motivates.
Frequently asked questions
- What is the difference between avalanche and snowball?
- Both pay all minimums, then focus extra money on one card. Avalanche targets the highest interest rate first (cheapest overall); snowball targets the smallest balance first (fastest first payoff, for motivation). The order of attack is the only difference.
- Which method saves more money?
- Avalanche, always — paying down the highest APR first minimizes the interest that accrues, so it costs the least in total and usually finishes at least as fast. The calculator quantifies how much it saves over snowball for your specific debts.
- Then why would anyone choose snowball?
- Behavior. Eliminating a whole card quickly is motivating and simplifies your finances, which helps people stay consistent. If the interest difference is small and the quick wins keep you on track, snowball can lead to better real-world outcomes than an avalanche plan you abandon.
- How does the simulation work?
- Each month it accrues interest on every card, pays each card's minimum, then applies all leftover budget to the target card (highest APR for avalanche, lowest balance for snowball). It repeats until everything is paid, summing interest and counting months.
- What if my budget is below the total minimums?
- Then neither strategy works as modeled — you cannot cover the required minimums, which risks fees and credit damage. Increase the budget, or seek help from a nonprofit credit counselor. The tool indicates when the budget is insufficient.
- Is this financial advice?
- No. It is an informational comparison. For serious debt situations, consult a nonprofit credit counseling agency or a financial advisor.