Credit Card Payoff Calculator 2026: Snowball vs Avalanche, Side by Side

Credit card debt math is brutal — at 22% APR, a $5,000 balance at the minimum payment takes over 20 years to pay off and costs nearly $8,000 in interest. A good credit card payoff calculator shows that number, then shows you exactly how much faster and cheaper you finish if you add $50 or $100 to the monthly payment, and which of your cards to attack first.

The two most common payoff strategies are snowball (pay off smallest balance first for psychological wins) and avalanche (pay off highest APR first for maximum interest savings). Almost every Reddit thread argues one is universally better. The truth is they finish within a month of each other for most realistic situations — but avalanche almost always saves more interest, and snowball almost always feels easier. Knowing the exact dollar difference for your specific cards is what makes a calculator worth using.

What the calculator needs from you

• Every credit card balance you currently owe.
• The APR (interest rate) on each card.
• The minimum monthly payment for each card.
• Your total monthly budget for credit card debt (must equal or exceed the sum of all minimums).

How the math actually works

Each month, your total budget pays the minimum on every card plus an 'extra' amount targeted at one specific card. Interest accrues monthly on each remaining balance at APR ÷ 12. The calculator runs this month by month until every card hits zero, recording the total interest paid and the payoff date.

Snowball method

Sort cards smallest balance first. Pay minimums on all cards, throw every extra dollar at the smallest balance until it's gone. Then add that card's freed-up minimum to the next-smallest card, and so on. The 'snowball' grows as each card disappears — psychological wins keep you in the game. Slightly more total interest than avalanche but a faster sense of progress.

Avalanche method

Sort cards highest APR first. Pay minimums on all cards, throw every extra dollar at the highest-APR balance. When it's gone, attack the next-highest APR. Mathematically optimal — minimizes total interest. Less satisfying psychologically because the first card to disappear is often not the smallest.

A worked example

Three cards: $1,200 at 18% (min $35), $3,500 at 22% (min $90), $850 at 26% (min $25). Total minimums: $150. Suppose you can pay $400/month total. Snowball attacks the $850 first (smallest), takes ~25 months total, costs ~$1,250 in interest. Avalanche attacks the $850 first too (highest APR coincidentally), takes ~24 months, costs ~$1,180 in interest. Difference: $70 — small here because the smallest happens to be the highest APR. In other portfolios, avalanche saves several hundred dollars.

Where extra payments matter most

Every extra dollar applied to a high-APR balance saves you that card's APR in interest annually. At 22% APR, $100 extra a month for 24 months saves roughly $580 in interest compared to making only minimums. The calculator shows this projection in dollars so you can decide whether to commit.

When neither method beats balance transfer

If you qualify for a 0% APR balance transfer card with an 18-month intro period and your transfer fee (typically 3–5%) is less than what you'd pay in interest over those 18 months, the transfer almost always wins. Run both scenarios in the calculator before committing.

What to do today

Pull every credit card statement, write down balance, APR, and minimum payment for each, and run the numbers. Whether you pick snowball or avalanche matters less than picking one, sticking to it, and adding even small extra payments — both methods beat doing nothing by years and thousands of dollars.