Debt Snowball vs Avalanche Calculator

How the debt snowball works

You pay the minimum on every debt, then put every spare dollar on the smallest balance. When it is gone, its minimum payment rolls into the next one, so the amount you can throw at your debts grows month after month.

Its strength is psychological, and that is not a small thing: a debt that disappears in three months keeps you going far better than a spreadsheet that improves by a few dollars. If you have abandoned a payoff plan before, start here.

How the debt avalanche works

Same principle, different target: your spare money goes to the debt with the highest interest rate, whatever its size. Mathematically it always wins, because you cut the most expensive interest first.

The difference is usually modest, but it grows quickly when one debt carries a much higher rate than the others — a credit card at 22% next to a car loan at 6%.

Which one should you choose?

• Your rates are close (within a few points): take the snowball, the cost is nearly the same and the motivation is better.
• One debt has a much higher rate: take the avalanche, the saving is real.
• You have given up before: snowball. The method you keep beats the one you abandon.
• You are comfortable with numbers and patient: avalanche.

Three things that matter more than the method

1. The extra payment. Move the slider: it is the single biggest lever. Going from $50 to $200 a month usually cuts years, not months.
2. Not adding new debt. A payoff plan next to a card you keep using is a bucket with a hole in it.
3. A small emergency fund first. Even $500 set aside stops the next flat tyre from becoming new debt.

Why do both methods show the same result?

Because your minimum payments are already large compared with your balances: the small debts clear on their own and there is little left to arbitrate. Enter your real minimums and the two plans start to diverge — most of all when a big debt carries a much higher rate than a small one.

Is the calculation accurate?

It uses your annual rate divided by twelve, applied to the remaining balance each month, which is how most credit cards and loans work. Your lender may round differently or charge fees, so treat the result as a very close estimate, not a contract.

What if I cannot even pay the minimums?

The calculator will tell you that your payments do not cover the interest. That is the signal to call your lenders and ask about a hardship plan or a lower rate before anything else.

Should I include my mortgage?

Usually not. Its rate is low and its balance is large, so it would swamp the plan. Start with cards, personal loans, car loans and store credit.

Is my data saved anywhere?

No. Everything is calculated in your browser, and your figures stay on your device so you find them again on your next visit. Nothing is sent to us.

What happens when a debt is paid off?

Its minimum payment is added to what you pay on the next debt. That rollover is exactly what makes both methods accelerate.