Which method saves more money?

Avalanche always minimizes total interest paid. By targeting the highest-rate debt first, you reduce the balance generating the most interest per month as quickly as possible. Snowball pays somewhat more total interest because it may leave a high-rate balance running while clearing a smaller, lower-rate balance. The exact difference depends on your specific debt mix. Enter your debts in the tool to see the dollar figure.

What if my minimum payment is less than the monthly interest?

The tool blocks the simulation and flags that specific debt row. A minimum below the monthly interest charge means the balance grows every month regardless of payments. You need to increase the minimum payment for that debt before the tool can run. Verify current figures with the IRS or relevant authority before making financial decisions, as rates change annually.

How does refinancing or a balance transfer affect the comparison?

If you move a balance to a lower APR or 0% introductory card, update that row's APR in the tool. The simulation recalculates. During a 0% promo period, that debt drops to the bottom of the Avalanche order, so other high-rate debts become the target. Model both optimistic and conservative scenarios to understand the range of possible outcomes before committing.

Can I include student loans with income-based repayment?

The tool models standard fixed-payment amortization. Income-based repayment plans have variable payment structures that do not fit the model. Enter the minimum payment you are actually required to pay and the tool will show the payoff trajectory from that amount. Verify current figures with the IRS or relevant authority before making financial decisions, as rates change annually.

Is there a hybrid approach?

Some people target a single small debt first for one quick win, then switch to Avalanche for the remainder. You can approximate this by running Snowball to estimate when the smallest debt clears, then re-entering the remaining debts to run Avalanche from that point.

How accurate is the month-by-month simulation?

The simulation uses simple monthly compounding: interest = balance x (APR / 12). This matches how most US lenders calculate interest for credit cards, auto loans, and personal loans. Results are accurate for planning purposes; actual payoff dates may vary by a month depending on billing cycle timing and exact payment dates.

Debt Snowball vs Avalanche Visualizer

Add your debts and extra monthly budget, see months to debt-free, total interest, payoff order, and a live chart for both strategies.

100% client-side. Your inputs stay in this browser.

List each debt with balance, APR, and minimum payment, then set how much you can pay above the combined minimums. Charts and KPIs update instantly.

Country / region

Saved with your inputs. The math is currency-neutral; amounts are shown in USD for display.

Debts

Name	Balance ($)	APR (%)	Min ($)

Extra monthly budget ($200), above all minimums

Snowball

Tie

2 yr 10 mo

Total interest: $2,826

Avalanche

Tie

2 yr 10 mo

Total interest: $2,826

Both strategies produce identical results for your debts.

Total remaining debt

Snowball payoff order

Card 1, month 15
Card 2, month 34

Avalanche payoff order

Card 1, month 15
Card 2, month 34

How this tool works

Add each debt as a row with its name, balance, APR, and minimum payment. Enter any extra monthly budget above your combined minimums. The tool simulates both strategies month by month: Avalanche directs all extra budget to the highest-APR debt first; Snowball targets the lowest-balance debt first. When a debt hits zero, its minimum rolls into the available budget for the next target. The results panel shows total interest paid, months to debt-free, the order debts were cleared, and a chart of total outstanding debt over time for both paths. You can enter $0 for extra budget to see your current minimum-only payoff timeline as a baseline.

Worked example

Three debts: Card A at $4,800 at 22% APR ($96 minimum), Auto loan at $7,200 at 6.5% APR ($140 minimum), Card B at $1,100 at 18% APR ($28 minimum). Extra monthly budget: $150. Avalanche sequence: Card A first (22% APR), then Card B (18%), then Auto loan (6.5%). Debt-free at approximately month 29, total interest approximately $2,890. Snowball sequence: Card B first ($1,100 balance), then Card A, then Auto loan. Debt-free at approximately month 30, total interest approximately $3,210. Avalanche saves roughly $320 and 1 month; Snowball clears Card B in month 5 for an early win.

Frequently asked questions

Which method saves more money?
Avalanche always minimizes total interest paid. By targeting the highest-rate debt first, you reduce the balance generating the most interest per month as quickly as possible. Snowball pays somewhat more total interest because it may leave a high-rate balance running while clearing a smaller, lower-rate balance. The exact difference depends on your specific debt mix. Enter your debts in the tool to see the dollar figure.
What if my minimum payment is less than the monthly interest?
The tool blocks the simulation and flags that specific debt row. A minimum below the monthly interest charge means the balance grows every month regardless of payments. You need to increase the minimum payment for that debt before the tool can run. Verify current figures with the IRS or relevant authority before making financial decisions, as rates change annually.
How does refinancing or a balance transfer affect the comparison?
If you move a balance to a lower APR or 0% introductory card, update that row's APR in the tool. The simulation recalculates. During a 0% promo period, that debt drops to the bottom of the Avalanche order, so other high-rate debts become the target. Model both optimistic and conservative scenarios to understand the range of possible outcomes before committing.
Can I include student loans with income-based repayment?
The tool models standard fixed-payment amortization. Income-based repayment plans have variable payment structures that do not fit the model. Enter the minimum payment you are actually required to pay and the tool will show the payoff trajectory from that amount. Verify current figures with the IRS or relevant authority before making financial decisions, as rates change annually.
Is there a hybrid approach?
Some people target a single small debt first for one quick win, then switch to Avalanche for the remainder. You can approximate this by running Snowball to estimate when the smallest debt clears, then re-entering the remaining debts to run Avalanche from that point.
How accurate is the month-by-month simulation?
The simulation uses simple monthly compounding: interest = balance x (APR / 12). This matches how most US lenders calculate interest for credit cards, auto loans, and personal loans. Results are accurate for planning purposes; actual payoff dates may vary by a month depending on billing cycle timing and exact payment dates.