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Debt snowball calculator
The debt snowball is a way to clear several debts at once by ordering them smallest balance first.
The snowball clears the smallest balance first while paying the minimum on the rest, then rolls each freed-up payment into the next debt.
You keep paying the minimum on every debt, then throw all your spare money at the smallest one until it is gone; when it clears, its freed-up payment rolls onto the next smallest, so the amount you can attack each debt with grows like a snowball rolling downhill. Enter up to three debts with their balances, rates and minimum payments, plus any extra you can add each month, and this tool returns how long until you are debt-free, the total interest you will pay, and the total cost. The snowball trades a little extra interest for momentum: ordering by balance rather than by interest rate gives you quick early wins that keep you motivated, which is why many people stick with it where a purely mathematical plan loses them. The alternative, the avalanche, pays the highest rate first and costs slightly less, and the tool lets you see the gap for your own numbers.
How it works
- Enter each debt balance, its APR and the minimum payment it demands each month.
- Add the extra amount you can put toward debt on top of all the minimums.
- The tool orders the debts smallest balance first, the heart of the snowball.
- Each month it adds interest to every debt, pays the minimums, and puts the rest on the smallest.
- When a debt clears, its payment rolls onto the next, and the tool counts the months to clear them all.
monthly budget = sum of all minimum payments + extra; the budget stays fixed and is aimed at the smallest debt first
The total you pay each month, the sum of every minimum plus your extra, stays constant from start to finish. Each month interest is added to every debt, the minimum is paid on all but the smallest, and whatever is left of the fixed budget is poured onto the smallest balance. When that debt clears, its minimum is no longer needed elsewhere, so the whole budget now bears down on the next smallest, and so on. Because the budget never shrinks while debts disappear, the payment hitting each remaining debt grows, which is the snowball effect.
- balance
- the amount owed on each debt
- minimum
- the smallest payment each debt requires
- extra
- the additional amount you add each month
- budget
- the fixed monthly total, minimums plus extra
Clearing a 1,200 card (22%) and 4,000 loan (12%)
| Minimums only | 55 months | over 1,840 interest |
| Extra 50/month | 31 months | less interest, faster |
| Extra 150/month | 21 months | about 629 interest, the example |
| Extra 300/month | 13 months | cleared in just over a year |
Worked example
You owe 1,200 on a card at 22 percent (minimum 40) and 4,000 on a loan at 12 percent (minimum 90), and can add 150 a month: the snowball attacks the 1,200 card first, since it is the smaller balance, while paying the 90 minimum on the loan. The card clears in about seven months, then its freed 40 plus your 150 roll onto the loan. Everything is gone in 21 months with about 629 in interest. Pay only the minimums with no extra and the same debts take 55 months and over 1,840 in interest. The extra 150 a month is what turns nearly five years into under two.
Key facts
- The snowball orders debts by balance, smallest first, not by interest rate.
- A cleared debt rolls its payment onto the next, so the attack on each debt grows over time.
- It usually costs slightly more interest than the avalanche but is easier to stick with.
- You always keep paying every minimum; only the spare money moves from debt to debt.
Tips
- List your debts smallest balance first and resist reshuffling once you start, since consistency is the point.
- Funnel any windfall, bonus or refund straight onto the current target debt to bring the next win forward.
- If staying motivated is not your problem, compare the avalanche order to save a little interest.
- Avoid taking on new debt while you snowball, because a fresh balance undoes the momentum.
Frequently asked questions
What is the difference between the snowball and the avalanche?+
The snowball orders debts by balance, smallest first, for quick psychological wins. The avalanche orders by interest rate, highest first, which clears the most expensive debt soonest and costs a little less in total. The snowball wins on motivation, the avalanche on maths; for many people the one they stick with is the better one.
Why pay the smallest balance first?+
Because clearing a whole debt quickly is satisfying and frees its minimum payment to add to the next, building visible momentum. That sense of progress is what keeps people going, and a plan you finish beats a cheaper one you abandon.
Does the snowball cost more than the avalanche?+
Usually a little, because it can leave a higher-rate debt running longer. The gap is often small, especially when the balances and rates are close, and the extra motivation can be worth more than the few pounds saved.
What if two debts have a similar balance?+
Order them however helps you most; with similar balances the difference is tiny. Some people break the tie by putting the higher-rate one first, which nudges the snowball toward the avalanche without losing the quick-win feel.
Should I always pay the minimums?+
Yes. Paying every minimum keeps the accounts in good standing and avoids penalty rates and fees. The snowball only ever adds the extra to one debt at a time; it never skips a minimum on the others.
Can I use this for more than three debts?+
The method works for any number; this tool takes three to keep the form simple. List your real debts smallest first, snowball the spare money onto the top one, and roll each cleared payment down the list exactly as shown here.
Things to watch
- The snowball can leave a high-rate debt running longer, so check the interest gap against the avalanche.
- It assumes you never miss a minimum; a missed payment can trigger penalty rates not modelled here.
- New borrowing while you pay down resets the plan, so pair the method with a pause on fresh credit.
Last updated: 2026
This is an estimate for general guidance, not financial, tax, legal or medical advice. Figures can change and individual circumstances vary. Always confirm with an official source before making decisions.
Built and maintained by Vikas Dulgunde. Editorial standards.