Debt Snowball Calculator

Last updated: August 5, 2026

Smallest balance first. Enter your debts and this snowball calculator builds the full month by month schedule: which debt to attack now, when each one disappears, and what the momentum costs or saves you in interest.

How to use this calculator

Add every debt you want included, with its balance, APR, and minimum payment. This tool always runs the snowball order: your smallest balance is targeted first regardless of its interest rate, and every debt's minimum still gets paid. Enter a recurring extra payment if you have one; the calculator handles rolling that minimum forward automatically once a debt closes.

Snowball method calculator

The tool above is a full snowball method calculator: it does not just tell you the order, it runs the complete schedule with rolling payments and shows when each account closes. Enter real balances and minimums, not estimates, because the payoff order is decided by the balances you type.

Worked example

Three debts: Card A with $2,400 at 26.99% APR and a $60 minimum, Card B with $850 at 22.15% APR and a $35 minimum, and a personal loan of $5,000 at 11.86% APR with a $150 minimum, plus $200 extra per month. The 22.15% and 11.86% figures are the Federal Reserve's published May 2026 averages for card accounts assessed interest and 24-month personal loans; Card A's 26.99% is a hypothetical above-average rate.

Under the snowball, Card B goes first and is gone in month 4. Its payment rolls onto Card A, which closes in month 13, and everything then lands on the personal loan, finished in month 22. Debt free in 1 year and 10 months (22 months) with $1,244.21 of total interest, against $5,186.33 and 8 years and 8 months (104 months) on minimum payments alone.

Snowball debt elimination calculator

If you have seen a tool called a snowball debt elimination calculator on a bank or credit union site, it is the same idea: smallest balance first with rolling payments. This version additionally shows the per-debt interest and lets you compare against the avalanche order or run both side by side.

The interest assumption, stated plainly

This calculator applies a monthly periodic rate, your annual rate divided by twelve, to each balance at the start of each month. Many card issuers instead apply a daily periodic rate, the APR divided by 365 or 360, to an average daily balance, which compounds daily. Your real statement will therefore differ from these results. Treat everything here as a planning estimate, not a payoff quote, and confirm figures with your lender. The full method and its sources are documented on the About page. Every figure on this page is generated by a Python engine, independently cross-checked against a JavaScript version before publishing, so the arithmetic itself has been verified even though it cannot capture your lender's exact billing cycle.

Frequently asked questions

What is the debt snowball method?

You make minimum payments on everything, then put every spare dollar toward the smallest balance. When it is gone, its entire payment rolls onto the next smallest debt, so the amount attacking each remaining balance keeps growing like a snowball. The order ignores interest rates on purpose: the goal is to clear whole accounts quickly.

Does the snowball method actually work?

It costs somewhat more interest than paying the highest rate first, but there is peer-reviewed evidence behind the psychology: a 2012 study in the Journal of Marketing Research found that closing debt accounts predicted eventual debt elimination regardless of the dollar amounts involved. Clearing whole accounts appears to be what keeps people going.

How much more does the snowball cost than the avalanche?

It depends entirely on your balances and rates. In the worked example on this page the snowball pays $1,244.21 in interest against $1,210.14 for the avalanche, a difference of $34.07, with both finishing in 22 months. Run the side by side comparison with your own debts to see your actual gap.

What if the smallest debt also has the highest rate?

Then the snowball and the avalanche produce exactly the same schedule, because both strategies target the same debt first. The difference between the methods only appears when the smallest balance and the highest rate belong to different debts.

Do I need to include my mortgage?

Standard practice is to run the snowball on consumer debts such as cards and personal loans, not the mortgage. You can add any debt you like here, but a large low-rate mortgage will dominate the schedule and hide what is happening with the rest.

Sources

• Board of Governors of the Federal Reserve System. Consumer Credit G.19, current release. Release date July 8, 2026, covering May 2026: 22.15% average on card accounts assessed interest, 11.86% average on 24-month personal loans. Checked 2026-08-03.
• Consumer Financial Protection Bureau. How does my credit card company calculate the amount of interest I owe? Checked 2026-08-03.