Compare Snowball vs Avalanche strategies. See exactly how extra payments accelerate your debt freedom.
Enter each of your debts — name, balance, interest rate, and minimum monthly payment — then set an extra monthly budget to apply on top of minimums. The calculator runs both the Snowball and Avalanche strategies simultaneously and shows your payoff date, total interest paid, and interest saved compared to paying minimums only. Use the comparison table to see which strategy works better for your situation.
The debt snowball method, popularised by Dave Ramsey, involves paying off debts from smallest balance to largest, regardless of interest rate. You make minimum payments on every debt, and any extra money goes toward the smallest balance. Once it's gone, you "roll" that freed-up payment to the next smallest. The primary advantage is psychological: quick wins keep motivation high, which is why people who use the snowball method are more likely to follow through to full debt freedom.
The debt avalanche method prioritises paying off debts with the highest interest rate first, regardless of balance. Extra payments attack the most expensive debt first, then roll down to the next highest rate. Mathematically, this always saves the most money in total interest and achieves payoff in the shortest time. The trade-off: if your highest-rate debt also has a large balance, you may go months without a "win" — which can make it harder to stay motivated.
The avalanche method wins mathematically — it minimises total interest paid. The snowball method wins psychologically — it maximises early momentum. Research from Harvard Business Review found that people are more motivated by paying off individual accounts than by optimising interest. The best strategy is whichever one you'll actually stick with. Enter your debts above to see the exact dollar difference between the two for your specific situation — sometimes it's surprisingly small.
Extra payments can dramatically cut both the time and cost of your debt. On a $10,000 credit card balance at 20% APR with a $250 minimum: paying just the minimum takes over 6 years and costs $8,000+ in interest. Adding $150/month extra cuts the payoff time nearly in half and saves over $4,000. The higher the interest rate, the larger the impact of extra payments. Even $50–$100 per month can make a meaningful difference — use the "Extra monthly budget" field to see the exact numbers for your debts.
The crossover point is your expected investment return — typically 6–8% annually for a diversified portfolio. If your debt interest rate is above that threshold, paying it off is the better financial move: it's a guaranteed, risk-free return equal to the rate. If your rate is below it (e.g. a 3% mortgage), you may come out ahead investing the difference — especially in tax-advantaged accounts. High-interest debt (credit cards at 18–29%) should almost always be paid off aggressively before investing anything beyond an employer match.
Stop adding new debt first — paying off a card and then using it again is counterproductive. Even small windfalls (tax refunds, bonuses) applied directly to principal have outsized impact. Call your lenders to negotiate a lower rate — credit card companies often accommodate good-standing customers. Consider a 0% balance transfer card to pause interest while you pay down principal. Once you're debt-free, redirect those same monthly payments directly into savings or investments.
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