Debt Payoff Calculator
Snowball vs avalanche strategy planner for multiple debts
Your fastest path to debt-free
Enter every debt, choose your strategy, and see a clear plan — how long it takes, how much it costs, and what to pay off first.
Avalanche method
Pay highest-rate debts first to minimize total interest — the mathematically optimal strategy.
Snowball method
Pay smallest balances first for quick wins that build momentum and motivation.
Side-by-side comparison
See exactly how much interest and time each strategy saves vs the other for your specific debts.
Extra payment power
Add an extra monthly amount and watch your payoff date move dramatically closer.
Multiple debts
Handle credit cards, personal loans, student loans, medical bills — any combination of debts.
100% private
All calculations run in your browser. Your debt details are never stored or shared.
When to use it
Getting started
Don't know where to begin? Enter all your debts and let the calculator build your plan.
Strategy decision
Torn between snowball and avalanche? See the dollar difference for your exact situation.
Extra money
Got a raise or bonus? See exactly how much a one-time or recurring extra payment helps.
Setting a date
Work backward from when you want to be debt-free to find how much extra to pay monthly.
Frequently Asked Questions
What is the debt avalanche method?
The avalanche method prioritizes paying off the debt with the highest interest rate first while making minimum payments on all others. Once the highest-rate debt is gone, you roll its payment to the next highest. This method minimizes total interest paid and is mathematically optimal — it costs less money than any other strategy.
What is the debt snowball method?
The snowball method pays off the smallest balance first regardless of interest rate, while making minimums on the rest. Once a debt is gone, its payment rolls to the next smallest. It costs more in total interest than the avalanche, but research shows it works better for many people psychologically — early wins motivate continued progress.
Which method is better: snowball or avalanche?
The avalanche saves more money; the snowball saves more motivation. If you can stay committed either way, choose avalanche for the best financial outcome. If past attempts at debt payoff have stalled, snowball may be more effective for you personally because the early wins keep you going. This calculator lets you compare both so you can make an informed choice.
How does adding an extra monthly payment help?
Extra money goes to your focus debt (first in the payoff order), accelerating its elimination. Once that debt is gone, you roll the now-freed minimum plus the extra into the next debt — called "debt stacking" or "the rollover effect." Even $50 extra per month can cut years off a payoff timeline and save thousands in interest.
Should I build an emergency fund before paying extra debt?
Most financial planners suggest a small emergency fund (typically $1,000–$3,000) before aggressively paying extra debt, to avoid going deeper into high-rate debt when something unexpected comes up. Once you have a starter emergency fund, redirect as much as possible to debt payoff; then, after the debt is gone, build the full 3–6 month emergency fund.
Understanding Debt Payoff Strategies
When you carry multiple debts — credit cards, personal loans, student debt, medical bills — the order you pay them off has a surprisingly large impact on both the total amount you pay and how long you stay in debt. Two strategies, the avalanche and the snowball, each represent different but valid approaches to the same problem.
Why order of payoff matters
All of your debts are accruing interest every month. When you focus extra payments on one debt and pay it off, you eliminate that debt's interest charge permanently. The key insight: high-rate debts cost the most per dollar of balance per month. If you pay off a 24% APR credit card before a 6% student loan, you eliminate a debt that was costing you four times as much per dollar, every month. That is the logic behind the avalanche method.
The psychology of debt payoff
Studies of actual debt payoff behavior — not just the math — have found that many people stay more committed to a plan when they get early wins. Paying off a small balance completely, even if it is not the most expensive debt, creates a tangible sense of progress. The freed minimum payment, rolled into the next debt, creates growing momentum. This is why the snowball method, despite costing more in interest, often outperforms the avalanche in practice for people who have struggled to stay on plan.
The rollover effect
Both strategies rely on the rollover: when one debt is paid off, instead of spending that freed-up money, you roll it into the next debt in line. A $100 minimum payment becomes $100 of extra ammunition on the next debt, which then gets paid off faster, freeing even more for the one after that. By the time you reach the last debt, you may have your entire original total minimum payment, plus your extra, all hitting one balance every month. The momentum is genuinely powerful.