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Debt Avalanche Calculator
Find the fastest, cheapest way out of debt. List each balance and rate, add any extra you can pay, then press Calculate to see your debt-free date and total interest saved.
Written by TopicDrill Editorial Team·Updated June 2026
Payoff order (highest rate first)
Credit cardGone by 1 yr 8 mo$1,556 interest
Car loanGone by 2 yr 4 mo$1,276 interest
Student loanGone by 3 yr 4 mo$1,862 interest
Balance over time
Total debtAdvertisement
How the debt avalanche calculator works
Each month the tool adds interest to every balance, pays the minimum on all of them, and then sends whatever is left over to the debt with the highest interest rate. When that debt hits zero, the full payment it was receiving cascades onto the next-highest rate, so your payoff power keeps growing without you spending an extra cent.
It repeats this month after month until every balance is clear, tracking the total interest you pay along the way. The payoff order list shows when each debt disappears, and the chart traces your combined balance falling toward zero.
A worked example
Imagine a $8,000 credit card at 22 percent, a $12,000 car loan at 7 percent and a $15,000 student loan at 5 percent, with $700 of minimums and $300 extra each month. The avalanche hammers the credit card first because it is the most expensive, clearing it well before the cheaper loans and saving a meaningful chunk of interest versus paying them evenly.
Things to keep in mind
The avalanche is the mathematically cheapest route, but it only works if you stick with it, so pick a payment you can sustain. Rates on variable cards can change, which shifts the order over time. For a neutral overview of payoff strategies, see the CFPB guide to paying down debt. If quick wins motivate you more than minimum interest, compare this with our debt snowball calculator.
Frequently asked questions
What is the debt avalanche method?
The avalanche method pays the minimum on every debt and then throws every spare dollar at the debt with the highest interest rate. Once that one is gone, its payment rolls onto the next-highest rate. Because the most expensive balance shrinks first, you pay the least interest overall.
How is the avalanche different from the snowball method?
The snowball method targets the smallest balance first for quick psychological wins, while the avalanche targets the highest rate first for the lowest cost. Avalanche almost always saves more money and time, but snowball can feel more motivating if early progress keeps you going.
Why does adding an extra payment help so much?
Minimum payments are mostly interest on high-rate debt, so progress is slow. Every extra dollar goes straight to principal on the most expensive balance, which cuts future interest and shortens the payoff. Even a modest extra amount each month can save months and a large sum of interest.
What if my payments do not cover the interest?
If your minimums plus the extra are smaller than the interest your debts accrue each month, the balance grows instead of shrinking and there is no payoff date. The calculator flags this so you know you need to raise your payment, lower a rate, or reduce a balance first.
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