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Free finance calculator
Compare debt snowball and debt avalanche strategies to estimate payoff time, total interest, and how much extra payments can help.
Payoff estimate
Enter your debt details to compare payoff strategies.
Estimate only. Confirm actual payoff details with each lender before making financial decisions.
Enter each debt balance, APR, minimum payment, and any extra monthly payment you can add. The calculator compares paying the highest-interest debt first with paying the smallest balance first.
The extra payment is assumed to roll forward after each debt is paid off. That rollover is what gives a payoff plan momentum: money that used to go to one paid-off debt gets redirected to the next balance instead of disappearing into the budget.
Extra payments usually help most when they stay consistent and stay attached to the payoff plan. Even a modest extra amount can shorten the timeline because the same dollars keep rolling forward after each debt is cleared.
If your budget is tight, test several extra-payment amounts instead of assuming one perfect number. A plan you can repeat every month is usually stronger than an aggressive number that only works once or twice.
The avalanche method usually reduces interest by targeting the highest APR first. The snowball method targets the smallest balance first, which can create faster visible wins and help motivation.
The mathematically cheapest plan is not always the plan someone will stick with. If the interest difference is small, the best strategy may be the one that keeps you consistent and prevents new debt from replacing the old balance. For a deeper walkthrough, read the Debt Snowball vs. Avalanche guide.
This estimate does not include new purchases, penalty rates, late fees, balance transfer fees, promotional APR expirations, or lender-specific minimum payment changes.
Minimum payments can also change as balances fall. This simplified version keeps the plan readable, but your actual statement may calculate the required payment differently each month.
If you want to reduce total interest, start with the highest APR. If you need a quick win to build confidence, start with the smallest balance. If one account has a promotional APR ending soon, test that balance separately because the rate change can alter the best order.
Common mistakes include paying extra without covering all minimum payments first, continuing new charges on the same cards, ignoring emergency savings, or losing track of promotional rate expiration dates. Use the estimate as a planning tool, then confirm payoff amounts with each lender.