Debt Payoff Calculator
Compare snowball vs. avalanche methods to pay off debt faster
Your Debts
Balance Over Time
Strategy Comparison
WHAT IF YOU PAID MORE?
Paying $100 more per month: gets you debt-free 6 months sooner and $1,002 in interest saved
Payoff Order
| # | Name | Month | Interest |
|---|---|---|---|
| 1 | Credit Card | 24 | $1,611 |
| 2 | Personal Loan | 36 | $3,055 |
| 3 | Auto Loan | 39 | $1,276 |
How to Choose Between Snowball and Avalanche
Avalanche targets the highest APR first — mathematically the cheapest path. Snowball clears the smallest balance first, stacking quick wins that keep you paying. Both roll freed minimum payments into the next target, so momentum builds either way. Take a $25,000 mix — $8,000 card at 22.99% APR, $10,000 personal loan at 10%, and $7,000 auto loan at 7%, each with a $150 minimum. Avalanche attacks the card first; snowball might clear the auto loan in under two years while the card keeps accruing.
On mixes like this the total interest gap often lands at $400–$800 over five or six years — smaller than people expect when they eyeball the rates. A Harvard Business Review study found small-win focus helped people finish; avalanche still wins on dollars. Run both in the calculator above side by side: if the gap is a few hundred dollars, pick the method you'll actually stick with for 48 months.
What Is the Debt Rollover Effect?
Pay off one account and its minimum payment doesn't vanish — it joins your attack on the next debt. A $150 minimum freed today becomes $150 of extra power tomorrow, and the payment pool grows with every cleared balance. Month one feels incremental; month eighteen after two rollovers, you may be sending $450 beyond minimums to a single target — principal drops faster because you're not splitting thin payments anymore.
Three debts at $150 minimum each: clearing the first permanently adds $150 per month to whatever strategy you chose. Clear the second and your focused payment jumps again — same total cash out, but now two minimums work on one remaining balance instead of three. That compounding payment pool is why accelerated plans feel slow at first, then suddenly fast. The calculator's payoff-order view shows exactly when each rollover kicks in.
Why Extra Payments Have a Compound Effect on Debt
Strategy choice is often a rounding error; extra payments are not. Avalanche vs snowball might differ by $300–$1,500 on $25,000 over several years. Compare extra amounts on that same pile: $50 per month might save $1,500+ and trim under a year; $100 per month often hits $3,000+ saved with 18 months cut; $200 per month can save $6,000+ and shave 3–4 years — because every dollar above interest goes straight to principal, and less principal means less interest next month.
$50 per month still shifts the curve — do not wait for a perfect budget. The sensitivity panel below the chart spells out months saved and interest avoided for each bump. After you're debt-free, redirect that cash flow with our Savings Goal Calculator.
The Hidden Cost of Minimum Payments
Minimum payments mostly feed interest. On a $6,500 card at 22.99% APR with a $150 minimum, about $125 of month one is interest — only ~$25 hits principal. Daily cost on that balance alone: $6,500 × 0.2299 ÷ 365 ≈ $4.10 per day, roughly $123 per month before you touch the balance. At minimum-only pace, payoff stretches 5+ years and $4,200+ in interest — nearly 65% of the original balance paid again as pure interest.
With multiple debts, each balance accrues interest daily while you spread thin minimums across all of them. The daily interest cost at the top of your results quantifies that bleed — often ~$12 per day on $25,000 at mixed rates, about $370 per month that never reduces principal. Concentrate extras on one target (snowball or avalanche) and that number drops the moment the highest-rate card is gone.
Frequently Asked Questions
- What is the difference between debt snowball and debt avalanche?
- The debt avalanche method pays off the highest interest rate debt first, minimizing total interest paid. The debt snowball method pays off the smallest balance first, providing quick wins for motivation. Both use the same rollover mechanic — when one debt is eliminated, its payment rolls into the next target.
- Which debt payoff strategy saves the most money?
- Avalanche always wins on total interest — or ties — because it kills the highest APR first. On typical mixed-rate debt, though, the gap vs snowball is often $300–$1,500 over several years. Enter your balances above: the side-by-side chart shows the exact dollar difference for your situation, not a generic rule of thumb.
- How much extra should I pay each month to pay off debt faster?
- Even $100 extra per month moves the needle. On $25,000 of mixed-rate debt at typical US rates, an extra $100 per month can save $3,000+ in interest and shave 18+ months off payoff. Bump it to $200 and savings often exceed $6,000 with 3–4 years cut. Slide the extra-payment input to see your exact break-even.
- What is the debt rollover effect and why does it matter?
- When you eliminate a debt, you no longer need to make its minimum payment. That freed-up money rolls into your next target debt, creating an ever-growing payment amount. This snowballing effect is the engine that makes accelerated payoff strategies so powerful — each cleared debt makes the next one fall faster.
- What is the daily cost of carrying debt?
- Daily interest = sum of (balance × APR ÷ 365) for each debt. A $6,500 credit card at 22.99% APR alone costs about $4.10 per day. Stack $25,000 across cards and loans at ~18% average and you're near $12 per day — roughly $370 per month that never touches principal. This calculator shows your live figure at the top of results. Framing debt as a daily expense often beats a multi-year timeline for motivation.
- Should I pay off debt or invest my extra money?
- Match your debt APR against expected after-tax investment returns. Credit cards at 20%+ almost always favor payoff first — you won't reliably earn 22% in the market. Mortgage or student loans under 4–5% may favor investing if you have decades of compounding ahead. Model your payoff timeline here, then project long-term growth with our Compound Interest Calculator.
- How long will it take to pay off my debt?
- It depends on your balances, APRs, minimum payments, and any extra you add — there's no single answer. On $25,000 of mixed-rate debt (card at 22.99%, personal loan at 10%) with $150 minimums each and no extra, payoff often runs 4–6 years. Add $100 per month and many mixes drop under 3 years. Enter your debts above: the debt-free date and months-to-payoff update instantly for snowball, avalanche, and minimum-only.