Debt Snowball / Avalanche Calculator
Enter your debts, choose a payoff method, and see exactly when you'll be debt-free.
Debt-Free In
47 mo
(3.9 years)
Total Interest
$3,350
Total Paid
$29,850
Payoff Order (Smallest Balance First)
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About This Calculator
The debt snowball and debt avalanche are two proven strategies for paying off multiple debts. The snowball method (popularized by Dave Ramsey) targets the smallest balance first for psychological wins. The avalanche method targets the highest interest rate first to minimize total interest paid. This calculator shows you exactly how long each approach takes and how much interest you'll pay.
How It Works
Both methods work by making minimum payments on all debts, then directing any extra money toward one target debt. In the snowball, the target is the smallest balance. In the avalanche, it's the highest interest rate. When a debt is paid off, its minimum payment is 'rolled' into the next target — creating a growing 'snowball' of payments.
The Formula
Worked Example
With $3,500 at 22.99% (min $70), $8,000 at 6.5% (min $200), and $15,000 at 5% (min $175), plus $200 extra per month: the snowball method pays off all debts in about 52 months with ~$4,200 in interest. The avalanche method takes a similar time but saves roughly $400 in interest by targeting the high-rate credit card first.
Tips & Best Practices
- •List all debts in a spreadsheet alongside this calculator to track progress month by month.
- •Celebrate each payoff — the psychological momentum of eliminating a debt is real and powerful.
- •Consider balance transfers or personal loans to consolidate high-interest credit card debt at a lower rate before starting your payoff plan.
- •Any windfalls (tax refunds, bonuses, side income) should go directly to your target debt.
Frequently Asked Questions
Which method is better — snowball or avalanche?
Mathematically, the avalanche always saves more money. But research shows the snowball method leads to higher completion rates because early wins keep people motivated. Choose the method you're most likely to stick with.
Should I include my mortgage?
Most financial advisors recommend excluding the mortgage from debt payoff strategies and focusing on high-interest consumer debt first. Mortgage interest is typically tax-deductible and at a much lower rate.
What if I can't afford extra payments?
Even $25–$50/month extra makes a significant difference. Focus on eliminating one small debt first to free up its minimum payment, then roll that into the next debt.
Should I save an emergency fund before paying off debt?
Most advisors recommend a $1,000 starter emergency fund before aggressively paying off debt, then building a full 3–6 month fund after high-interest debt is cleared.
Common Mistakes to Avoid
Making only minimum payments — minimum payments are designed to keep you in debt for decades. Even $50 extra per month dramatically shortens payoff time.
Not rolling freed-up minimum payments into the next debt — this is the core mechanic that makes the snowball/avalanche work. Without it, you lose most of the benefit.
Continuing to add new debt while paying off existing debt — this is like bailing out a boat while leaving the tap running.
Ignoring high-interest debt in favour of paying off low-balance debts that have a low rate — if the rate is under 5%, investing the extra money may be mathematically better.
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