Debt Payoff Calculator
Compare debt snowball vs avalanche side by side. Enter your debts and see months to debt-free, total interest, and interest saved.
Interest saved with your extra payment (Avalanche)
$2,632
Compared with paying only the minimums. That's what your extra $100/month is buying you.
Avalanche saves $590 in interest and 1 month versus Snowball. Snowball can still be the right choice if quick wins keep you motivated — the "best" plan is the one you'll actually finish.
Balance timeline — Avalanche
Every debt shrinking to zero, month by month.
Per-debt breakdown
| Debt | Starting balance | Interest paid | Payoff month |
|---|---|---|---|
| Car Loan | $2,500 | $157 | 1 yr 9 mo |
| Store Card | $4,800 | $1,850 | 3 yr 2 mo |
| Credit Card | $9,000 | $4,154 | 3 yr |
Build the rest of your plan
Paycheck Calculator
See how much of your take-home pay you can realistically redirect toward extra debt payments without breaking the rest of your budget.
Compound Interest Calculator
Compare what that same extra payment could earn if invested instead of used to pay down low-rate debt faster.
Loan Calculator
Modeling a debt consolidation loan instead? See what a single new loan payment would look like before you apply.
How to use
- 1
Add every debt you owe: credit cards, car loans, personal loans, student loans — with balance, APR and minimum monthly payment.
- 2
Enter any extra amount you can put toward debt each month, and optionally a one-time lump sum like a tax refund or bonus.
- 3
Compare snowball and avalanche side by side, then pick the strategy that fits how you actually stick to plans in real life.
Debt Payoff Calculator — Snowball vs Avalanche
Free debt payoff calculator that compares the debt snowball and debt avalanche methods on the exact same inputs. See months to debt-free, total interest, and how much a little extra payment really saves.
Skycally's Debt Payoff Calculator lets you enter every debt you owe — credit cards, car loans, personal loans, student loans — and simulates month-by-month what happens under two of the most-used payoff strategies: the debt snowball (smallest balance first) and the debt avalanche (highest interest rate first). Instead of running two separate calculators and comparing tabs, both plans are computed on the same inputs and shown side by side, with total interest paid, months to debt-free, and a clear payoff date for each. The whole thing runs in your browser: no signup, no account, no data leaves your device.
The debt snowball method, popularized by Dave Ramsey, tells you to throw every extra dollar at your smallest balance first — regardless of interest rate — because clearing a debt entirely gives you a psychological win that keeps you on plan. The debt avalanche method attacks the highest APR first, which is mathematically optimal: you pay the least total interest and become debt-free the fastest. Avalanche wins on paper almost every time; snowball wins in the real world for people who need momentum to stick with a hard, multi-year plan. This calculator is deliberately even-handed — it labels whichever plan wins on interest, but doesn't pretend the other is wrong.
Extra payments matter more than most people realize. Because credit-card interest compounds monthly, every dollar above the minimum reduces principal that would otherwise keep accruing at 20%+ APR for years. This tool shows the interest you save specifically by adding your extra monthly amount versus paying only the minimums — the single most motivating number when you're deciding whether to squeeze another $50 or $100 out of the budget. A one-time lump sum (a tax refund, a bonus, a stimulus check) applied early in the plan often cuts more time off the payoff than months of grinding extra payments later, so the calculator lets you model that too, with a month picker so you can see the exact timing effect.
A payoff plan is only part of getting out of debt. Use our Paycheck Calculator to see how much of your take-home you can realistically redirect toward extra payments without breaking the rest of your budget. Before throwing every spare dollar at low-rate debt, consider that the same money invested might grow faster than the interest you're saving — our Compound Interest Calculator lets you compare that trade-off head to head. And if you're weighing a consolidation loan to combine several high-rate debts into one lower-rate payment, the Loan Calculator will show you what that single new payment would look like before you commit.
Frequently Asked Questions
What is the debt snowball method?
The debt snowball is a payoff strategy where you order your debts by balance from smallest to largest, pay the minimum on all of them, and throw every extra dollar at the smallest balance until it's gone. Once that debt is cleared, its old minimum plus your extra amount rolls onto the next-smallest — like a snowball growing as it rolls. It ignores interest rate entirely; the point is fast, visible wins that keep you motivated.
What is the debt avalanche method?
The debt avalanche orders your debts by APR from highest to lowest and directs every extra dollar to the highest-interest debt first, regardless of balance. Because you're always killing off the most expensive interest first, avalanche mathematically minimizes total interest paid and usually gets you debt-free the fastest. The tradeoff is you may not see a debt disappear entirely for months if your highest-APR balance is also your biggest.
Which is better, snowball or avalanche?
Avalanche is mathematically better — it always pays equal or less total interest, and usually gets you debt-free sooner. But personal finance is 80% behavior. Studies have found that people using the snowball method are more likely to actually finish their payoff plan, because clearing a debt entirely is a huge motivator. If your interest rates are all similar, the math difference is small and snowball's momentum wins. If one of your debts is at 25% APR and another at 5%, the avalanche gap widens and the math starts to really matter.
Does paying extra every month really save that much interest?
Yes — usually more than people expect. Credit-card interest compounds monthly, so every dollar of extra payment reduces the principal that would otherwise keep growing at 20%+ for years. On a $5,000 credit card at 22% APR with a $120 minimum, adding just $100/month extra can cut your payoff time roughly in half and save well over a thousand dollars in interest. The calculator's 'interest saved with your extra payment' number is computed from your specific debts.
Should I pay off debt or invest extra money instead?
General rule: pay down anything above roughly 7–8% APR before investing extra (that's the long-term average stock market return, and paying off high-rate debt is a guaranteed return of that rate). For low-rate debt like some student loans and mortgages, investing may come out ahead over long horizons. Always capture any employer 401(k) match first — that's an instant 50–100% return no debt can beat. Our Compound Interest Calculator lets you model the investing side of that comparison.
What if my minimum payments don't cover the interest?
If your minimums are less than the interest accruing each month, your balance grows even while you pay — a debt spiral. The calculator will show an amber underwater warning when this is happening. Options: increase your monthly payment enough to cover interest plus some principal, call your lenders and negotiate a lower rate, or look into debt consolidation to combine everything into one lower-rate loan. A nonprofit credit counselor (NFCC-affiliated) can help if you're stuck.
Should I consolidate my debts instead of paying them off one by one?
Consolidation can help if you qualify for a rate meaningfully lower than what you're paying now — for example, moving $15,000 of credit card debt at 22% APR into a personal loan at 11%. But it only works if you don't rack up new debt on the freed-up cards. Balance-transfer cards with 0% promo APRs can be even better for smaller balances, as long as you can pay it off before the promo ends. Use our Loan Calculator to see what a consolidation loan payment would look like before applying.
How is this different from a regular loan calculator?
A loan calculator handles one debt at a time — you plug in principal, rate, and term to see one monthly payment. A debt payoff calculator handles many debts at once and answers a different question: given a fixed budget across all of them, in what order should you attack them and how long will the whole plan take? It also rolls freed-up minimum payments from cleared debts onto the next priority debt, which a single-loan calculator can't model.
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