This free debt snowball calculator lists your debts smallest balance first, shows the exact payoff order, and rolls each cleared payment into the next debt so you can watch the snowball grow. Then it compares snowball vs avalanche side by side.
Enter each debt with its balance, APR, and minimum payment. Add the extra amount you can put toward debt each month. Click Calculate to see your snowball payoff order, the rollover cascade, and how snowball compares to avalanche.
Enter your debts and your extra monthly payment, then click Calculate. You will see the smallest-first payoff order, the rollover cascade, your debt-free date, and snowball vs avalanche side by side.
The debt snowball method is a payoff strategy that orders your debts from the smallest balance to the largest and attacks the smallest one first, regardless of interest rate. You pay the minimum on every debt, then throw every extra dollar you have at the debt with the smallest balance. When that debt hits zero, its payment does not disappear. You roll it into the next smallest debt, then the next, and the amount aimed at each debt grows as you go.
It was popularized by Dave Ramsey, and the logic is behavioral rather than mathematical. Paying off a whole account gives you a visible, complete win early, and those wins are what keep most people going long enough to actually finish. The calculator above builds this order for you automatically and shows exactly when each debt disappears.
Rollover is the engine that makes the snowball roll. Here is the sequence, and it is worth understanding because it is where the acceleration comes from.
By the time you reach your largest debt, the payment hitting it is much bigger than it was at the start, because it now includes the freed-up payments from every debt you have already knocked out. The cascade view in the results shows this growing payment for each debt in your list.
These are the two main payoff orders, and the calculator shows you both so you are not guessing.
You clear whole debts fastest, which builds momentum. This is the better fit if you have felt stuck before, if you have several small balances you could wipe out quickly, or if seeing progress is what keeps you on track.
You pay the least total interest because you attack your most expensive debt first. This is the better fit if you are disciplined, your highest-rate debt is not also your smallest, and you want to squeeze out every dollar of savings.
Neither is wrong. A 2012 study from Northwestern University's Kellogg School of Management (Gal and McShane, published in the Journal of Marketing Research) found that people who paid off their smallest balances first were more likely to eliminate their entire debt than those who followed the mathematically optimal high-interest-first order. The plan you finish beats the cheaper plan you abandon. The calculator puts a dollar figure on exactly what the snowball's motivation costs you in extra interest, so you can decide with real numbers.
Say you have three debts: a $800 store card at 27 percent, a $3,500 credit card at 22 percent, and a $9,000 car loan at 7 percent, and you can put an extra $200 a month toward debt on top of your minimums.
The snowball attacks the $800 store card first. It disappears in the first couple of months, and that whole payment rolls into the $3,500 credit card. Once the credit card clears, both freed-up payments plus your extra roll onto the car loan, which gets crushed far faster than it would on its own. You feel two complete wins early, which is the point.
The avalanche would attack the 27 percent store card first too in this case, because it happens to be both the smallest and the highest rate, so here the two methods start the same. That is not always true. When your highest-rate debt is a large balance, the two orders diverge and the calculator will show a real interest gap between them.
These stack on top of the method itself and can pull your debt-free date forward by months.
Tax refunds, bonuses, side income, and gift cash go straight onto your current target debt. A few hundred dollars dropped on the smallest balance can clear it a month or two early and start the next rollover sooner.
Call your card issuers and ask for a lower APR, or move high-rate balances to a 0 percent transfer card. The snowball orders by balance, but a lower rate means more of every payment hits principal.
The fastest way to stall a snowball is to keep charging while you pay it down. Freeze the cards you are paying off and switch to cash or debit until the plan is finished.
When a debt clears, resist the urge to pocket that freed-up payment. Rolling it forward is the entire mechanism. Spend it and the snowball melts.
The debt snowball method is a payoff strategy where you list your debts from smallest balance to largest, pay the minimum on everything, and throw every extra dollar at the smallest balance first. When that debt is cleared, you roll its payment into the next smallest debt. The order ignores interest rate on purpose, because the goal is fast, visible wins that keep you motivated.
The avalanche method almost always saves more interest, because it targets your highest APR debt first. The snowball method usually costs slightly more in total interest but clears your first debt faster, which research shows makes people more likely to finish. This calculator shows you both numbers side by side so you can see exactly what the motivation is costing you.
Rollover is the engine of the snowball. When your smallest debt is paid off, the payment you were making on it does not disappear. You add it on top of the minimum for the next smallest debt. As each debt clears, the payment aimed at the next one grows larger, so the snowball rolls faster and faster toward the end.
For many people, yes. A 2012 study from Northwestern University's Kellogg School of Management found that people who paid off their smallest balances first were more likely to eliminate their entire debt than those using the mathematically optimal approach. A plan you actually finish beats a cheaper plan you quit. If you are highly disciplined and want to minimize interest, avalanche is the better fit.
Most people leave the mortgage out of the debt snowball and focus on unsecured and consumer debt like credit cards, personal loans, medical bills, and auto loans. A mortgage is usually a large, lower-rate debt that would sit at the bottom of the list for years. Clear your consumer debt first, then decide separately whether to accelerate the mortgage.
If your total monthly payment is not larger than the interest building up each month, the balances will grow instead of shrink and no payoff order can fix that. You need to either raise your monthly payment, lower your rates through a balance transfer or hardship program, or seek help from an NFCC accredited non-profit credit counselor. The calculator will warn you if your payment is too low.
Calculator results are estimates based on standard financial formulas and the inputs you provide. Actual outcomes depend on your specific debt terms, payment timing, and any rate changes by your lenders. SavingsClub is not a licensed financial advisor. Content is researched and drafted using AI tools with human review before publication. For decisions involving your specific situation, consult a licensed financial advisor or NFCC accredited credit counselor. Read full disclaimer.