Debt Avalanche Calculator — Pay Off Debt Fastest
The debt avalanche method directs your extra monthly payment to the debt with the highest interest rate first, minimising the total interest you pay. Enter up to three debts with their APR and minimum payments, add an extra monthly amount, and see exactly when you will be debt-free.
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Total interest cost using the avalanche method (highest APR first)
How does this calculator work?
Debt avalanche: pay minimums on all debts, then throw every extra dollar at the highest-APR debt. When it is gone, roll its minimum to the next highest rate. This minimises total interest paid. Enter balances, APRs, minimums and an extra monthly amount; see total interest and payoff months.
Formula
How this is calculated
The avalanche method is mathematically optimal for minimising interest paid. Each month, you pay the required minimum on every debt (so none go delinquent), then apply any extra payment to whichever debt carries the highest annual percentage rate. When that debt reaches zero, its minimum and any extra roll to the next highest-rate debt — this is the "debt roll-up" or "debt roll-over" effect.
The calculator simulates this month-by-month: it first adds one month of interest (APR ÷ 12) to each balance, then subtracts the minimum payment, then applies the extra amount to the current highest-rate target. When a debt reaches zero its minimum payment is freed and added to the available extra for subsequent months.
Compared to the snowball method (targeting smallest balance first), the avalanche saves more money in interest but may feel slower at first because the high-rate debt is not necessarily the smallest. The chart shows the combined balance falling to zero, so you can see the payoff trajectory. Leave any debt set to $0 to compare one or two debts rather than three.
Frequently asked questions
The avalanche method always pays less total interest than the snowball. The snowball (smallest balance first) gives quicker early wins that can improve motivation. Mathematically optimal = avalanche; psychologically motivating = snowball. Either beats paying only minimums.
Its minimum payment is freed. The calculator automatically rolls that freed minimum into the extra payment applied to the next highest-rate debt — so your total monthly payment stays the same but more goes to the next target.
Mortgages typically have lower rates than credit cards or personal loans, so the avalanche will tackle them last. Most people focus the avalanche on high-interest consumer debt first and treat mortgage separately. Enter only the debts you want to aggressively pay down.
Also known as
TG we-Calculate Editorial Team. (2026). Debt Avalanche Calculator — Pay Off Debt Fastest [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/debt-avalanche-calculator
TG we-Calculate Editorial Team. "Debt Avalanche Calculator — Pay Off Debt Fastest." TG we-Calculate. 2026. https://we-calculate.com/calculator/debt-avalanche-calculator.
TG we-Calculate Editorial Team, "Debt Avalanche Calculator — Pay Off Debt Fastest," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/debt-avalanche-calculator
@misc{wecalculate_debt_avalanche_calculator, title = {Debt Avalanche Calculator — Pay Off Debt Fastest}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/debt-avalanche-calculator}}, year = {2026}, note = {TG we-Calculate} }
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