Debt Payoff Calculator: Snowball vs Avalanche
Calculate how long it will take to pay off your debt. Enter your balances, interest rates, and extra monthly payment to compare the debt snowball and avalanche methods—see which strategy saves more money and gets you debt-free faster.
Enter Your Debts
Add all your debts below. We'll calculate the best payoff strategy for you.
Avalanche Method
Pay off debts with the highest interest rate first. This method saves the most money in interest over time.
- Mathematically optimal
- Saves most money
- May take longer to see progress
Snowball Method
Pay off debts with the smallest balance first. This method provides quick wins for motivation.
- Quick psychological wins
- Builds momentum
- May pay more interest
How to Use This Debt Payoff Calculator
This debt payoff calculator compares two proven debt elimination strategies: the debt snowball method (paying smallest balances first) and the debt avalanche method (paying highest interest rates first). Enter each debt's name, balance, interest rate, and minimum payment, then add any extra monthly payment you can afford. The calculator shows your debt-free date, total interest paid, and which method saves more money.
Debt Snowball vs Avalanche: How They Work
Debt Snowball Method
- List all debts from smallest to largest balance
- Pay minimum payments on all debts
- Put all extra money toward the smallest debt
- When that debt is paid off, roll that payment to the next smallest
- Repeat until debt-free
Best for: People who need quick wins for motivation. Seeing debts disappear keeps you engaged.
Debt Avalanche Method
- List all debts from highest to lowest interest rate
- Pay minimum payments on all debts
- Put all extra money toward the highest-rate debt
- When that debt is paid off, roll that payment to the next highest rate
- Repeat until debt-free
Best for: People focused on saving the most money. Mathematically optimal but may take longer to see progress.
Read our complete guide comparing snowball vs avalanche →
Why Extra Payments Matter So Much
The "Extra Monthly Payment" field is where the magic happens. Even small additional payments dramatically accelerate your debt payoff because they go entirely toward principal—reducing future interest charges. Consider this example:
$10,000 credit card at 20% APR, $200 minimum payment:
- Minimum only: 108 months to pay off, $11,680 total interest
- +$100 extra: 44 months to pay off, $3,795 total interest
- +$200 extra: 30 months to pay off, $2,365 total interest
An extra $100/month saves $7,885 in interest and 5+ years of payments!
Frequently Asked Questions
Which is better: snowball or avalanche?
The avalanche method saves more money mathematically. However, research shows many people have better success with the snowball method because the quick wins maintain motivation. The "best" method is whichever one you'll actually stick with. Use the calculator to see the actual dollar difference—if it's small, go with snowball for the psychological benefits.
Should I include my mortgage in this calculator?
This calculator works best for consumer debt (credit cards, personal loans, car loans, student loans, medical debt). Mortgages are typically lower-interest, long-term debt that many people pay separately. However, if you want to see how extra mortgage payments affect your timeline, you can include it.
What if I can't afford extra payments?
Start with just minimum payments—the calculator still shows your payoff timeline. Meanwhile, look for ways to free up even $25-50 extra monthly: cut a subscription, sell unused items, or pick up a side gig. Read our guide to getting out of debt on a low income →
Should I pay off debt or build an emergency fund first?
Build a small emergency fund ($1,000-$2,000) first to prevent new debt from unexpected expenses. Then attack debt aggressively. Once debt-free, grow your emergency fund to 3-6 months of expenses. Learn how to build an emergency fund →
What about debt consolidation?
Debt consolidation (combining multiple debts into one loan) can be helpful if you get a significantly lower interest rate. However, it doesn't reduce what you owe—just reorganizes it. If consolidation simplifies your payments AND lowers your rate, consider it. But don't consolidate if it means a longer payoff period with more total interest.
How do I stay motivated during debt payoff?
Track your progress visually (debt thermometer, spreadsheet chart). Celebrate milestones without spending. Tell someone about your goal for accountability. Remember your "why"—what will being debt-free enable? Read our 15 tips for the debt-free journey →
After Becoming Debt-Free
Once you've eliminated your debt, redirect those payments toward building wealth: