Which pays off debt faster, snowball or avalanche?
Both methods clear exactly the same debts; the only difference is the order — smallest balance first (snowball) or highest interest rate first (avalanche). Enter your debts once above to see both plans side by side.
The debt avalanche is the mathematically optimal way to pay off multiple credit cards and other debts, because it targets your highest interest rate first and so pays the least total interest. The debt snowball targets your smallest balance first, clearing whole accounts quickly to build momentum. Because your overpayment — not the order — is what really drives the speed, the two usually finish within a similar timeframe, and this calculator shows the exact difference on your own numbers.
Which method wins for you?
Choose the snowball for motivation and the avalanche for the lowest interest — but a consistent overpayment matters more than either.
The snowball works because of a well-documented bias called debt account aversion: faced with several debts, people feel a strong pull to reduce the number of open accounts, not just the total owed. Clearing a small balance early is a real, visible win that keeps you going. The avalanche ignores that pull and simply minimises cost. If you have struggled to stick with a plan before, the snowball's higher completion rate usually makes it the safer default; if you are confident you will keep going and one or two high-APR debts dominate your interest bill, the avalanche saves you the most. Either way, the single biggest lever is how much you can consistently overpay each month — get that number right first with the budget planner.
How much does the snowball actually cost vs the avalanche?
The extra you pay for choosing the snowball over the avalanche is called the interest premium — and for a typical debt mix it is usually small.
The interest premium is the extra interest you pay for prioritising motivation over maths. Run the pre-filled example above and the calculator shows it as the "interest saved by avalanche" figure — often just a few tens to a few hundred dollars, and it shrinks the more you overpay. That premium matters because the macro backdrop is unforgiving: the average US household carries roughly $6,700 on credit cards, with average card APRs above 21%. Total US credit-card balances have passed $1.1 trillion. When rates are that high, cutting your interest bill with the avalanche is harm reduction, not just optimisation — which is why seeing the premium in pounds and dollars helps you make an informed choice rather than a purely emotional one.
When the two methods give the same answer
Snowball and avalanche produce an identical plan when your smallest debt is also your highest-rate debt, or when one large debt dominates everything else.
The order only diverges when balance size and interest rate disagree. If your smallest balance also happens to carry the highest APR, both methods attack it first and the plans are identical. Likewise, when one large debt dominates your portfolio, the order in which you clear the smaller debts barely moves the overall timeline, so the two methods land within a month of each other. In those cases the "which method" debate is moot — just pick the one you will stick with and keep the overpayment going. The calculator makes this obvious: when the difference boxes read close to zero, the choice is purely about motivation.
The hybrid approach: start snowball, switch to avalanche
Many people start with the snowball for one or two quick wins, then switch to the avalanche once they are motivated and only larger, higher-rate debts remain.
You do not have to commit to one method for the whole journey. A popular hybrid is to clear your one or two smallest balances first — banking the psychological win and reducing the number of accounts you juggle — then switch to attacking the highest remaining APR to minimise what is left in interest. Because this calculator runs both methods at once, you can re-run it at any point with your remaining debts to see whether switching now is worth it. Our full snowball vs avalanche guide walks through the psychology and the maths in more depth.
How the minimum-payment maths works
This calculator uses whichever of your fixed floor or percentage minimum is higher each month — the same way a real US card works — which is more accurate than tools that assume a flat 2–4% minimum.
To calculate a debt snowball or avalanche accurately you have to get the minimum payment right. Minimums work on a percentage OR fixed floor, whichever is higher basis, and this tool always processes the higher of the two values you enter, recalculating it each month as the balance falls. Under the CFPB's rules, a regulated credit-card minimum must cover the interest, fees and charges applied that month plus at least 1% of the outstanding principal — a floor designed to prevent negative amortisation, where your balance grows even though you are paying. On top of that, most retail cards apply a flat monetary floor, typically $5–$25, and you pay whichever is higher. Assuming a single flat percentage — as many comparison tools do — understates real minimums and distorts the payoff order, which is why we ask for both figures.