Small wins first.

Debt snowball pays off the smallest balance first while making minimum payments on others. The psychological lift from quickly eliminating one debt drives motivation to tackle the next. This calculator estimates your payoff time and cost using the snowball strategy.

15,000 in debt averaging 15% with 500 monthly payments takes roughly 38 months to clear. The first debt (say, a 1,200 balance) goes in about 2-3 months - a concrete early win. Clearing that produces the behavioural boost that helps sustain the remaining 35 months of the plan.

The tool treats your debts at an average rate, not each debt individually. Real-world snowball typically results in slightly more interest than an avalanche plan, but the behavioural advantages are real. Studies show people following snowball are more likely to actually complete the payoff - worth more than the small extra interest.

A worked example

Try the defaults: total debt of 15,000, average interest rate of 15%, monthly payment total of 500, smallest individual balance of 1,200. The tool returns 38 months. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.

What moves the number most

The result responds to Total Debt, Average Interest Rate, Monthly Payment Total, and Smallest Individual Balance. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.

The formula behind this

Standard amortisation with total debt and average rate. First debt clearance estimated as smallest balance / monthly payment (simplified). Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.

Reading the output honestly

The payoff date assumes every payment lands on time and at the amount you entered. In reality, months with unexpected expenses happen. Treat the figure as the best-case timeline and add a buffer for life if you want a realistic target.

What this doesn't capture

Real payoff journeys include missed payments, fee changes, balance transfers, and promotional rates that reset. The calculation assumes a steady plan; reality is rarely that clean. Use the figure as the best-case plan against which actual progress gets measured.