Debt Payoff Strategy Calculator

Snowball, popularized by Dave Ramsey, attacks the smallest balance first regardless of interest rate. You knock out small debts in two or three months, free their minimum into the snowball, and ride momentum to the next debt. Avalanche attacks the highest interest rate first regardless of balance, which always produces the lowest total interest cost. The trade-off is psychological vs mathematical: snowball gives you visible wins fast, avalanche saves money but the first debt may take much longer to retire.

Behavioral economics research, including a 2016 Harvard Business Review study by Gal and McShane, found that people who used the snowball method were more likely to actually clear their debt because the early wins kept them on the plan. Avalanche is mathematically optimal, but it only wins if you finish. If you have abandoned a payoff plan before, snowball is usually the better bet. If you are disciplined and the interest gap is large, avalanche keeps the savings. This calculator recommends snowball when avalanche would save less than $100 in interest, since the behavioral lift typically outweighs a small math edge.

The 1% rule is a quick screen: if a single debt's balance is more than 1% of your monthly gross income, the monthly interest alone will eat a noticeable chunk of every paycheck. For a $5,000 monthly income, any debt above $50 of monthly interest (roughly a $3,500 balance at 18% APR) qualifies. That does not mean the debt is unmanageable, but it does mean you need a deliberate payoff plan rather than minimum payments. Add an extra payment in this calculator and watch how dramatically that single line item shortens the timeline.

A 0% balance transfer card moves high-interest credit card debt to a new card with a 0% promotional APR, usually for 12 to 21 months. You pay a one-time transfer fee (typically 3% to 5% of the moved balance) and then every dollar of payment goes to principal during the promo window. The math works if you can clear the balance before the promo ends; if you cannot, the regular APR (often 20%+) snaps back on whatever is left. Use this calculator first to confirm you can realistically clear the debt inside the promo period at the payment amount you can actually sustain.

A consolidation loan replaces several high-rate debts with one fixed-rate personal loan, usually 6% to 20% APR over 2 to 7 years. The trade-offs: you get one predictable monthly payment and often a lower blended rate, but you also extend the timeline (which can mean more interest paid even at a lower rate) and reset the psychological clock. If your weighted-average APR across debts is above 18% and you qualify for a sub-12% consolidation loan, the math usually favors consolidation. If your debts are already at moderate rates, snowball or avalanche on the existing structure often costs less than the loan origination fee plus the longer term.