Debt Snowball Calculator

Both methods pay minimums on every debt and throw all extra money at one target debt, but they choose that target differently. The snowball attacks the smallest balance first, delivering quick, motivating wins as debts disappear one by one. The avalanche attacks the highest interest rate first, which minimizes the total interest you pay and usually clears everything a bit sooner. The snowball is about psychology and momentum; the avalanche is about math and cost. This calculator computes both so you can compare your debt-free date and total interest under each and pick the one you will actually stick with. Our guide comparing debt snowball vs debt avalanche walks through both in depth.

Mathematically, yes. Targeting the highest interest rate first, the avalanche method, minimizes the total interest you pay and typically shortens your payoff timeline. However, the best method is the one you will follow through on. If seeing a debt fully eliminated keeps you motivated, the snowball's quick wins may help you stay disciplined even though it costs slightly more in interest. The difference in total interest between the two is often modest when balances are similar. This calculator shows both outcomes side by side so you can weigh the interest savings against the motivational benefit.

The method is named for the way your payment amount builds like a rolling snowball. When you finish paying off one debt, the money that was going to its minimum payment does not go back into your budget; instead it is added to the extra payment you make on the next debt. So each successive debt is attacked with a larger and larger combined amount, accelerating your progress as you go. This calculator simulates that cascade, rolling freed-up minimums plus your extra payment onto the priority debt until each one is cleared in turn.

Yes. The calculator lets you add, edit, or remove any number of debts, entering each one's balance, interest rate, and minimum payment. This means you can model your exact situation, from a single loan to a mix of credit cards, car loans, and student loans. As you change the list or the extra payment amount, the projected debt-free date, total interest, and payoff order update accordingly. Enter accurate current balances and rates for the most realistic plan, and revisit the tool as balances change to keep your payoff schedule up to date.

No. It models interest based on the rate you enter for each debt and assumes you make every payment on time. It does not add late-payment fees, penalty interest rates, annual fees, or other charges that lenders may impose after a missed payment. In real life those fees can make debts more expensive and slow your progress, so paying at least the minimum on every debt by its due date is essential to the plan working as projected. Treat the debt-free date and total interest here as a best case assuming consistent, on-time payments.

Yes, and that is the core of both methods. Every extra dollar goes to principal on your target debt, shrinking the balance that accrues interest and speeding up payoff, which then frees that debt's payment to accelerate the next one. The larger your extra monthly payment, the sooner you become debt-free and the less total interest you pay. This calculator also compares your plan against making only minimum payments, showing the interest you save. Even a modest, consistent extra amount can make a large difference, so direct any spare money in your budget toward the plan.