Debt Snowball Calculator
Smallest balance first. List your debts, add whatever extra you can, and see each balance fall away — with the interest cost compared against the avalanche method.
Your debts
$13,100 totalLocked to the snowball order: extra payments always target your smallest remaining balance, then roll forward.
You are debt free in
4y 4m
around December 2030
- Total interest
- $5,355
- Total paid
- $18,455
- Monthly payment
- $355
- Balance today
- $13,100
What one more $50 does
Paying $405 instead of $355 each month:
3y 7m total
$4,016 total
Balance over time
Solid line is your current plan; the lighter line adds $50 a month.
Snowball vs avalanche, side by side
Debt snowball
Smallest balance first4y 4m
$5,355 total interest
Order: Store card → Personal loan → Credit card
Debt avalanche
Highest APR first4y 4m
$5,355 total interest
Order: Store card → Personal loan → Credit card
Both strategies cost about the same here — pick whichever keeps you motivated.
Month-by-month payoff schedule
Every payment, split into interest and principal.
| Month | Payment | Interest | Principal | Balance |
|---|---|---|---|---|
| 1 | $355.00 | $177.92 | $177.08 | $12,922.92 |
| 2 | $355.00 | $175.63 | $179.37 | $12,743.55 |
| 3 | $355.00 | $173.32 | $181.68 | $12,561.87 |
| 4 | $355.00 | $170.97 | $184.03 | $12,377.84 |
| 5 | $355.00 | $168.59 | $186.41 | $12,191.43 |
| 6 | $355.00 | $166.17 | $188.83 | $12,002.60 |
| 7 | $355.00 | $163.72 | $191.28 | $11,811.33 |
| 8 | $355.00 | $161.24 | $193.76 | $11,617.57 |
| 9 | $355.00 | $158.72 | $196.28 | $11,421.29 |
| 10 | $355.00 | $156.16 | $198.84 | $11,222.45 |
| 11 | $355.00 | $153.57 | $201.43 | $11,021.02 |
| 12 | $355.00 | $150.94 | $204.06 | $10,816.96 |
Educational estimate, not financial advice. Plan My Payoff uses simplified monthly interest math and assumes fixed rates and on-time payments. Your lender's fees, compounding method, and payment posting dates will change the real result. Check your statements or talk to a qualified professional before making decisions.
How the debt snowball works
The snowball method sorts your debts by balance, smallest to largest, and ignores the interest rates entirely. Every debt gets its minimum payment each month. Whatever extra you can find goes to the smallest balance alone, until that debt is gone. Then its whole payment — minimum plus extra — is added to the next-smallest debt, and so on. Each payoff makes the next one faster, which is where the name comes from.
A worked example
Take the three debts loaded above: a $900 store card at 26.99% paying $35, a $4,200 credit card at 21.24% paying $110, and an $8,000 personal loan at 12.5% paying $210. That is $355 a month in minimums. Add $100 of extra and the snowball sends $135 to the store card while the others tick along at their minimums.
The store card disappears in about seven months. Its $35 now joins the extra, so the credit card starts receiving $245 a month instead of $110 — and when the credit card clears, the personal loan receives $455. The final debt, which looked immovable at the start, gets paid down more than twice as fast as it was at the beginning.
The cost of ignoring interest rates
Because snowball does not look at APR, it can leave an expensive debt sitting longer than the avalanche method would. That costs money. How much depends entirely on your spread: if your smallest debt also happens to carry the highest rate, snowball and avalanche produce nearly identical results. If your largest debt is your most expensive one, the gap widens.
The comparison above runs both plans on your actual numbers and prints the dollar difference. For a lot of households it lands somewhere between fifty and a few hundred dollars — real money, but often a price worth paying for a plan that gets finished.
Who the snowball suits
Choose snowball if you have several small balances, if you have abandoned a payoff plan before, or if seeing an account close is what keeps you going. Choose avalanche if your rates vary widely and you are confident you will stick with a plan that shows slower visible progress. There is no wrong answer here: both beat paying minimums by years.
Keeping the plan on track
Print the schedule and keep it somewhere visible, then re-run the calculator whenever a balance, rate or payment changes. The figures here assume fixed rates, on-time payments and no new borrowing, so a fresh run every few months keeps the payoff date honest.
Frequently asked questions
- What is the debt snowball method?
- You pay the minimum on every debt and throw all extra money at the smallest balance first. When it's gone, its payment rolls onto the next smallest — the 'snowball' grows as each debt disappears.
- Is the snowball method better than the avalanche method?
- The avalanche method almost always costs less interest, but snowball clears individual debts sooner, which helps people stay motivated. This page shows both totals side by side so you can see the exact dollar difference for your numbers.
- How much extra should I put toward the snowball?
- Any amount helps. Use the +$50 comparison to see how many months and dollars each increment saves before committing to a number you can sustain.
- Does the snowball include mortgages or car loans?
- You can include any fixed debt. Many people leave out a mortgage and include cards, car loans and personal loans — add or remove rows to match your plan.
- What if two debts have the same balance?
- Break the tie with the higher interest rate, since clearing it saves more. The difference to your payoff date will be negligible either way.
- Should I keep the snowball going after a debt is paid off?
- Yes — that rollover is the whole method. If the freed-up payment goes back into everyday spending, the snowball stops growing and the remaining debts take far longer to clear.
- Does the snowball hurt my credit score?
- Paying debts down generally helps, because it lowers your credit utilisation. Closing a card after clearing it can reduce your available credit and nudge the score the other way, so many people leave the account open and unused.
- Is my data private?
- Yes. Everything runs in your browser. No account, no upload, nothing saved once you close the tab.
Other free payoff calculators
Multiple cards, one plan. See every month until you're free.
Highest APR first — the lowest total interest math.
See how extra payments shorten an auto loan.
Model several loans and one combined payoff date.