Debt Snowball Calculator
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This debt snowball calculator shows when you’ll be debt-free using the snowball or the avalanche. Enter up to five debts and it shows the payoff order, total interest and how the two methods compare. In the example below, $13,900.00 of debt is gone in 35 months with $100.00 extra a month.
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How to use the debt snowball calculator
- Choose snowball (smallest balance first) or avalanche (highest rate first).
- Enter the extra amount you can add on top of your minimum payments each month.
- Enter up to five debts: balance, APR and the minimum payment. Leave unused rows blank.
- Read when you’ll be debt-free, the order the debts are cleared, the total interest, and how the other method compares.
How the debt snowball and avalanche are calculated
Each month
1. Add interest: Balance × (APR ÷ 12)
2. Pay the minimum on every debt
3. Put all the remaining money (extra + freed-up payments) on the target debt
4. When a debt reaches $0, its minimum rolls into the next target
Choosing the target
The snowball targets the smallest remaining balance. The avalanche targets the highest APR. Everything else is identical, so the two methods use exactly the same total monthly payment.
Debt Snowball Calculator examples
Example 1: two debts at 0%, so you can check every number
Debt A is $500.00 with a $50.00 minimum. Debt B is $1,000.00 with a $50.00 minimum. You add $100.00 extra, so you pay $200.00 a month in total. In months 1 to 3, A gets $150.00 and B gets $50.00. In month 4, A needs only $50.00 to finish, so the remaining $100.00 goes to B. From month 5, B gets the full $200.00. Everything is paid off after 8 months ($1,500.00 ÷ $200.00 = 7.5, rounded up), A in month 4 and B in month 8, with no interest.
Example 2: when the order matters
Debt 1 is $500.00 at 5% (minimum $25.00). Debt 2 is $2,000.00 at 25% (minimum $60.00). With $100.00 extra, the snowball clears the small debt first and pays $438.29 in interest over 16 months. The avalanche attacks the 25% debt first and pays $362.65 over 16 months, saving $75.64.
Snowball vs avalanche on the same three debts
The default example in the calculator has a $900.00 medical bill at 0% (minimum $40.00), a $5,500.00 credit card at 23% (minimum $120.00) and a $7,500.00 car loan at 6.5% (minimum $230.00). With $100.00 extra, the monthly payment is $490.00 for both methods. Here is what each one does.
| Snowball | Avalanche | |
|---|---|---|
| Debt-free after | 35 months | 35 months |
| Total interest | $2,997.52 | $2,782.27 |
| Total paid | $16,897.52 | $16,682.27 |
| Extra money goes first to | Medical bill (smallest balance) | Credit card (highest rate) |
The avalanche costs $215.25 less in interest here, because the avalanche puts the extra money on the 23% card first, while the snowball spends its first months on the 0% medical bill. If you paid only the minimum on each debt and never rolled payments forward, the last debt would take 112 months instead of 35.
Which method should you pick?
If the goal is the lowest cost, the avalanche is never worse on interest, and the table shows how big the gap is for your own debts. The snowball can cost a little more, but it clears whole debts sooner, so you get a debt crossed off earlier and one fewer payment to manage. Whether that is worth the extra interest is a personal choice, and this calculator shows both sides so you can see the price of it. The snowball method is best known from Ramsey Solutions.
When the smallest balance is also the highest rate, the two methods give the same result.
What a bigger extra payment changes
Same three debts, $390.00 in minimums, with different amounts added each month.
| Extra a month | Snowball time | Snowball interest | Avalanche time | Avalanche interest | Avalanche saves |
|---|---|---|---|---|---|
| None | 49 months | $4,871.12 | 48 months | $4,811.40 | $59.71 |
| $50.00 | 42 months | $4,154.65 | 40 months | $3,593.70 | $560.95 |
| $100.00 | 35 months | $2,997.52 | 35 months | $2,782.27 | $215.25 |
| $200.00 | 28 months | $2,138.71 | 27 months | $1,928.38 | $210.33 |
| $400.00 | 20 months | $1,405.69 | 20 months | $1,235.50 | $170.18 |
The extra amount does more than the method. Moving from nothing to $100.00 extra shortens the plan far more than switching between snowball and avalanche.
Mistakes that slow a debt snowball
- Dropping the minimums on other debts. Every debt still gets its minimum each month. Only the extra goes to the target.
- Not rolling the freed-up payment. When a debt is cleared, add its whole payment to the next target. If it goes back into your spending, the snowball stops growing.
- Borrowing again. New charges on a card you are paying down add to the balance faster than the plan shrinks it. The calculator assumes no new borrowing.
- Ignoring a low promotional rate. A 0% balance may be fine to pay last. If a promotional rate is about to end, update the APR in the calculator when it does.
Calculator or spreadsheet?
A spreadsheet works too, but you have to build the monthly interest, minimums and rolling payments yourself and keep them consistent as debts drop out. This calculator does that for up to five debts and shows both methods together. If you prefer a spreadsheet, the steps in the formula section above are the ones to copy.
Debt Snowball Calculator questions
What is the debt snowball method?
You list your debts from the smallest balance to the largest, pay the minimum on all of them, and put every extra dollar on the smallest one. When it’s gone, you add its whole payment to the next smallest debt, so the amount you throw at debt grows like a snowball rolling downhill.
What is the debt avalanche method?
The same idea, but you target the debt with the highest interest rate first. It usually costs less interest than the snowball, because the most expensive debt shrinks first. The snowball gives you quick wins sooner, which some people find easier to stick with.
Which is better, snowball or avalanche?
The avalanche costs less interest or the same. In the example above it saves $75.64. The snowball is about momentum: you clear whole debts earlier. This calculator shows both for your own numbers so you can decide.
Do I keep paying the old minimums after a debt is paid off?
Yes. That’s the point of the method. When a debt is cleared, its minimum payment is added to the extra money and goes to the next target. The total you pay each month stays the same until you’re debt-free.
What if a minimum payment is less than the interest?
Then that debt grows even while you pay it. The calculator checks for this and tells you if the payments can’t clear the debts. Raise the minimum or the extra amount.
How do I use a debt snowball calculator?
List each debt with its balance, APR and minimum payment, enter how much extra you can pay each month, and read the payoff order and the debt-free date. Change the extra amount to see how much sooner you could finish.
Does the debt snowball work with a mortgage?
You can add any debt that has a balance, rate and minimum, but most people use it for credit cards, personal loans, medical bills and car loans. A mortgage is usually a very large balance at a lower rate, so it would sit at the end of the order.
How long will it take to pay off my debts?
It depends on your balances, rates and how much extra you pay. In the default example, $13,900.00 of debt takes 35 months with $100.00 extra a month, compared with 112 months if each debt is paid on its own with only its minimum.
Is the interest exact?
It’s a close estimate. The calculator adds a month of interest at APR ÷ 12 to each debt and then applies payments. Real lenders may calculate interest daily and round differently.
What this calculator doesn’t do
- It handles up to five debts. Add smaller debts to the one nearest in size if you have more.
- It assumes fixed APRs, no new borrowing and no fees. Variable rates, promotional rates and late fees aren’t included.
- It treats every debt as a loan with a minimum monthly payment. Interest-only and balloon loans aren’t modelled.
- Interest is estimated monthly, so a lender’s statement may differ slightly.
Results are estimates for planning, not financial advice. The methodology page explains how every calculator here is built and checked.