Debt Snowball Spreadsheet: Build It and Compare It With Avalanche

What is the debt snowball method?

The debt snowball pays debts from smallest balance to largest, whatever the interest rate. You pay the minimum on everything, put every spare dollar on the smallest debt, and when it is gone you add its payment to the next one. The payment grows as it rolls - hence snowball.

Ramsey Solutions, whose Baby Steps plan is built around it, describes the method as listing your nonmortgage debts from smallest to largest balance and paying them in that order regardless of interest rate; in its Baby Steps plan, paying off all debt except the house with the snowball is Baby Step 2 (Ramsey Solutions: How the Debt Snowball Method Works).

The alternative is the debt avalanche: same rollover, but ordered by highest interest rate first. The rest of this page runs both on identical debts so you can see the trade-off in months and dollars, not opinions.

Debt snowball calculator (try your own debts)

Enter each debt's balance, APR and minimum payment, plus any extra you can pay each month. Switch between snowball and avalanche to see the difference on your own numbers.

The math simulates month by month: interest is added to each balance (APR / 12), minimums are paid, and the extra plus any freed-up minimums go to the target debt. It is a planning aid, not financial advice.

Snowball vs avalanche on the same four debts

Here are four example debts totalling $21,700, with $595 of minimum payments and $200 extra, so $795 goes to debt every month. The balances, rates and minimums are assumptions for illustration.

The whole difference comes from the 24% credit card. Snowball leaves it at minimum payments for longer while it clears the two smaller debts, and that card charges $1,294.86 more interest under snowball than under avalanche.

Which is better, debt snowball or debt avalanche?

Avalanche usually costs the same or less interest; snowball gives you paid-off debts sooner. In this example avalanche saves $781.65 and one month. Snowball gives you a first win in month 6 instead of month 25, and two debts gone by month 16.

Which matters more is personal. If a long wait with nothing paid off would make you quit, the $781.65 is the price of staying on the plan. If you will stick with it regardless, avalanche is cheaper. The gap grows when your smallest debts carry the lowest rates, and it disappears when ranking by balance and by rate give the same order, because both methods then pay debts in the same sequence.

Ramsey Solutions recommends the snowball and argues that seeing progress early keeps people going (same source as above). Run your own debts through both before you choose; the spreadsheet does it in seconds.

What is the extra payment worth?

The extra payment matters more than the order. Take the same four debts with no extra money - just the $595 of minimums, still rolling each freed-up minimum into the next debt:

That takes 50 months and $7,975.63 of interest. Adding $200 a month with snowball cuts it to 34 months and $4,850.44: 16 months sooner and $3,125.19 less interest. Snowball vs avalanche was worth $781.65; the extra $200 was worth four times that. Your budget's spare cash is the lever - the free 50/30/20 budget starter is one way to find it.

How long will it take to pay off $30,000 in debt?

It depends on the interest rate and what you pay each month. At an assumed 20% APR on a single $30,000 balance:

At $600 a month, the first month's interest is $500, so only $100 reduces the balance. That is why a small increase in payment has an outsized effect: going from $600 to $750 saves $15,190.64 of interest. In Excel, =ROUNDUP(NPER(20%/12,-750,30000),0) returns 67.

How to build a debt snowball spreadsheet in Excel or Google Sheets

You need one row per debt and one column per month. Excel has no single built-in snowball function, but four formulas cover it.

1. Columns A to D: debt name, balance, APR, minimum payment.
2. Sort the rows: smallest balance first for snowball, highest APR first for avalanche (formulas below).
3. In each month column, add interest (balance x APR / 12), subtract the minimum, and subtract any extra if this row is the current target.
4. When a balance reaches zero, add its minimum to the extra for the next row. This rollover is the step most homemade sheets get wrong.
5. Count the months until every balance is zero and sum the interest column.

A single-loan amortization schedule covers one loan; the snowball needs the rollover logic across several. For the PMT and amortization basics behind a single loan, the rental property analysis guide walks through PMT line by line.

Common debt payoff spreadsheet mistakes

Most payoff plans fail on the spreadsheet before they fail in real life. Check yours for these:

• No rollover. If a paid-off debt's minimum disappears from the plan instead of moving to the next debt, the payoff date slips by months.
• Interest left out. Dividing balance by payment ignores interest. $30,000 / $750 says 40 months; the real answer at 20% APR is 67.
• Promotional 0% rates treated as permanent. Put the date the promo ends in the sheet and model the rate after it.
• New charges not recorded. A card you are still using needs its new spending added to the balance each month.
• No link to a budget. The extra payment has to come from somewhere; a plan without a budget tends to lose it. The cash flow forecast guide shows how to plan money in and out by month.

Debt snowball spreadsheet vs apps vs printable trackers

Printable trackers are good for colouring in progress; apps are good for bank syncing and reminders; a spreadsheet is good for running what-ifs and seeing the formula. Pick by what you will actually open every month.

What to put in your debt payoff spreadsheet: each debt's name, balance, APR and minimum; your extra monthly payment; a method switch (snowball or avalanche); the payoff month for each debt; total interest; your debt-free date; and a budget tab that shows where the extra comes from.

The personal budget and debt payoff planner combines a 50/30/20 budget, actual-vs-planned tracking and snowball or avalanche payoff with a debt-free date, in Excel or Google Sheets for $14.99 (also in the $49 7-template bundle). Prefer to start free? The 50/30/20 starter shows how the live formulas work. If you want the payoff math in the same file as your budget, the debt snowball spreadsheet with budget does that.

Step-by-step: Debt Snowball Spreadsheet: Build It and Compare It With Avalanche

1. List every debt. Write each debt's name, balance, APR and minimum payment in one row. Leave the mortgage out if you follow the Ramsey version.
2. Choose the order. Sort by smallest balance for snowball, or by highest APR for avalanche.
3. Set the monthly total. Add your minimums plus the extra you can afford. The example uses $595 + $200 = $795.
4. Attack the first debt. Pay minimums on all debts and put the extra on the first debt in your order.
5. Roll the payment forward. When a debt hits zero, add its whole payment to the next debt. Keep the monthly total the same.
6. Track and update monthly. Enter real balances each month so the debt-free date stays honest. The example finishes in 34 months with snowball.

Related guides