★ COMPARISONS · DEBT SNOWBALL VS AVALANCHE · WHICH IS CHEAPER
Avalanche wins by $309.80 — both methods take 23 months, so the difference is purely the $309.80 of interest. Two debts, one $600 monthly budget: the snowball attacks the smaller debt first and clears it in month 6, the avalanche attacks the higher rate first and clears it in month 18 — and the avalanche costs $2,452.18 of interest against the snowball’s $2,761.98.
Two real debts, one monthly budget: which payoff order costs less, and which debt disappears first? The snowball targets the smaller balance; the avalanche targets the higher APR. Both are simulated month by month on the same debts.
On the defaults — Debt A $3,000 at 18%, Debt B $8,000 at 24%, a $600 monthly budget, $50 minimums — the snowball attacks Debt A first because it is the smaller balance, and clears it in month 6. The avalanche attacks Debt B first because it carries the higher rate, and clears it in month 18. Both methods take 23 months to clear both debts, so the winner is decided on interest alone: the snowball costs $2,761.98 of interest, the avalanche $2,452.18, and the avalanche wins by $309.80. While the snowball attacks Debt A, Debt B grows by about $110 a month — its $50 minimum is below its $160 monthly interest ($8,000 × 24% ÷ 12) — so the snowball spends six months watching the bigger debt get bigger before it turns to face it.
Setup: Debt A $3,000.00 at 18%, Debt B $8,000.00 at 24%, budget $600.00 a month, minimum $50.00 per debt.
Line 1 — the minimums. Every month $50.00 goes to each open debt first — $100.00 of the $600.00 budget — and the remaining $500.00 goes to the target debt.
Line 2 — the snowball’s first six months. The snowball puts the extra $500.00 on Debt A, which falls from $3,000.00 to $0.00 in month 6; meanwhile Debt B’s $50.00 minimum is below its $160.00 monthly interest, so Debt B grows from $8,000.00 to $8,572.44 over the first five months, and only starts falling in month 6 (to $8,547.97) once Debt A is gone and the freed-up budget turns on it.
Line 3 — the avalanche’s first eighteen months. The avalanche puts the extra $500.00 on Debt B, which falls from $8,000.00 to $0.00 in month 18; Debt A’s $50.00 minimum is just above its $45.00 monthly interest, so Debt A only shrinks from $3,000.00 to $2,903.98 over the first seventeen months, then drops to $2,546.72 in month 18 when Debt B is gone and the freed-up budget turns on it.
Line 4 — the finish. Both methods clear the second debt in month 23 — the snowball’s last five months are all on Debt B, the avalanche’s last five months are all on Debt A.
Line 5 — the totals. Snowball: 23 months, interest $2,761.98, total paid $13,761.98. Avalanche: 23 months, interest $2,452.18, total paid $13,452.18. Avalanche wins by $309.80. Rounding convention: totals are computed from unrounded values, so rounded parts may differ by a cent from their rounded sum.
Budget $400/mo: Snowball first gone Debt A, month 10; 40 months; interest $4,966.60. Avalanche first gone Debt B, month 31; 39 months; interest $4,327.35. Avalanche wins by $639.25. A smaller budget makes the avalanche’s edge bigger — the interest has more months to compound on the debt the snowball ignores.
Budget $1,000/mo: Snowball first gone Debt A, month 4; 13 months; interest $1,508.67. Avalanche first gone Debt B, month 10; 13 months; interest $1,355.87. Avalanche wins by $152.80. A bigger budget shrinks the gap — with more money every month, the interest has fewer months to do damage either way.
Debt A APR 24% (equal APRs): Snowball first gone Debt A, month 6; 24 months; interest $2,839.70. Avalanche first gone Debt A, month 6; 24 months; interest $2,839.70. TIE — identical. With equal APRs the avalanche tie-break picks the same target as the snowball, so both methods are the same plan.
Debt B balance $3,000: Snowball first gone Debt A, month 6; 12 months; interest $700.31. Avalanche first gone Debt B, month 6; 12 months; interest $609.06. Avalanche wins by $91.25. With equal balances the snowball’s tie-break picks Debt A and the avalanche picks Debt B on the rate — and the rate wins.
Minimum $100: Snowball first gone Debt A, month 7; 23 months; interest $2,755.35. Avalanche first gone Debt B, month 20; 23 months; interest $2,506.98. Avalanche wins by $248.37. Bigger minimums shave a little off the snowball’s interest, but the avalanche still wins by $248.37.
Debt A balance $8,000: Snowball first gone Debt A, month 17; 38 months; interest $6,402.95. Avalanche first gone Debt B, month 18; 36 months; interest $5,181.54. Avalanche wins by $1,221.41. When the smaller-rate debt is also the bigger balance, the snowball spends 17 months on it while Debt B’s interest piles up — the avalanche’s biggest win on this page.
Smallest budget for the avalanche to finish in 24 months: $568 a month. At $568 the avalanche finishes in 24 months (first gone Debt B, month 19; interest $2,629.36; total paid $13,629.36). One dollar less, $567, takes 25 months (interest $2,635.53).
Smallest budget for the avalanche to finish in 12 months: $1,027 a month. At $1,027 the avalanche finishes in 12 months (first gone Debt B, month 10; interest $1,315.61; total paid $12,315.61). One dollar less, $1,026, takes 13 months (interest $1,316.98).
Debt A APR at which the avalanche first targets Debt A: 24.00%. At 23.99% the avalanche still targets Debt B first (gone month 18, 24 months total, interest $2,838.97); at 24.00% the tie-break already targets Debt A (gone month 6, 24 months total, interest $2,839.70). The flip happens exactly at the equal rate.
Smallest budget for the snowball’s first debt to be gone in 3 months: $1,081 a month. At $1,081 the snowball clears Debt A in month 3 (12 months total; interest $1,387.20; total paid $12,387.20). One dollar less, $1,080, leaves Debt A standing until month 4 (interest $1,388.60).
Smallest budget where the avalanche advantage is $500 or less: $454 a month — a threshold crossing, not an exact-$500 solution. At $454 the gap is $498.22 (snowball interest $4,070.86, avalanche interest $3,572.64); at $453 the gap is $500.31. The avalanche advantage falls below $500 for the first time at a $454 budget.
Smallest budget for the snowball to finish in 24 months: $579 a month. At $579 the snowball finishes in 24 months (first gone Debt A, month 6; interest $2,893.73; total paid $13,893.73). One dollar less, $578, takes 25 months (interest $2,900.58). The snowball needs $11 a month more than the avalanche to hit the same 24-month finish.
The budget is the TOTAL paid each month across both debts; the minimums are paid on every open debt before any extra goes to the target; the comparison window is the whole payoff, not a fixed term; new charges, fees and rate changes are NOT included; if a minimum is below a debt’s monthly interest, that debt’s balance GROWS while it waits — the model shows this, it does not hide it. At a $100 budget — the minimums only — neither method finishes: Debt B grows by about $110 a month because the $50 minimum is below its $160 monthly interest. A budget below the sum of the minimums is an error; a budget equal to the sum with interest exceeding the payment is a never-state, not an error. At 0% APR on Debt A the snowball takes 23 months and $2,546.23 of interest while the avalanche takes 21 months and $1,549.18 — avalanche wins by $997.05. With Debt B at $0, Debt B is already gone (month 0); Debt A alone takes 6 months and $142.61 of interest, and both methods are identical. At a $5,000 budget the snowball clears Debt A in month 1 and finishes in 3 months ($355.68 of interest) while the avalanche clears Debt B in month 2 and finishes in 3 months ($333.84) — avalanche wins by $21.84. Rounding convention: totals are computed from unrounded values, so rounded parts may differ by a cent from their rounded sum.
| Output | Formula | What it means |
|---|---|---|
| Snowball first gone | smallest balance first; month its balance hits $0.00 | Debt A, month 6. |
| Snowball months | months until both debts are $0.00 | 23. |
| Snowball total interest | sum of all monthly interest, snowball order | $2,761.98. |
| Snowball total paid | interest + both balances | $13,761.98. |
| Avalanche first gone | highest APR first; month its balance hits $0.00 | Debt B, month 18. |
| Avalanche months | months until both debts are $0.00 | 23. |
| Avalanche total interest | sum of all monthly interest, avalanche order | $2,452.18. |
| Avalanche total paid | interest + both balances | $13,452.18. |
| Winner | lower total interest wins | Avalanche. |
| Gap | snowball interest − avalanche interest | $309.80. |
| Smallest budget, avalanche 24 months | smallest whole dollar with avalanche months ≤ 24 | $568.00 → $568.00. |
| Smallest budget, avalanche 12 months | smallest whole dollar with avalanche months ≤ 12 | $1,027.00 → $1,027.00. |
| Debt A APR where avalanche targets Debt A | avalanche tie-break at equal APRs | 24.0000% → 24.00%. |
| Smallest budget, snowball first debt in 3 months | smallest whole dollar with snowball first-gone ≤ 3 | $1,081.00 → $1,081.00. |
| Smallest budget, avalanche advantage ≤ $500 | smallest whole dollar with the gap ≤ $500 | $454.00 → $454.00. |
| Smallest budget, snowball 24 months | smallest whole dollar with snowball months ≤ 24 | $579.00 → $579.00. |
| Budget $400/mo | same model | Snowball First gone Debt A, month 10; 40 months; total interest $4,966.60; total paid $15,966.60 | Avalanche First gone Debt B, month 31; 39 months; total interest $4,327.35; total paid $15,327.35 | Avalanche wins by $639.25. |
| Budget $1,000/mo | same model | Snowball First gone Debt A, month 4; 13 months; total interest $1,508.67; total paid $12,508.67 | Avalanche First gone Debt B, month 10; 13 months; total interest $1,355.87; total paid $12,355.87 | Avalanche wins by $152.80. |
| Debt A APR 24% (equal APRs) | same model | Snowball First gone Debt A, month 6; 24 months; total interest $2,839.70; total paid $13,839.70 | Avalanche First gone Debt A, month 6; 24 months; total interest $2,839.70; total paid $13,839.70 | Tie — both methods cost the same.. |
| Debt B balance $3,000 | same model | Snowball First gone Debt A, month 6; 12 months; total interest $700.31; total paid $6,700.31 | Avalanche First gone Debt B, month 6; 12 months; total interest $609.06; total paid $6,609.06 | Avalanche wins by $91.25. |
| Minimum $100 | same model | Snowball First gone Debt A, month 7; 23 months; total interest $2,755.35; total paid $13,755.35 | Avalanche First gone Debt B, month 20; 23 months; total interest $2,506.98; total paid $13,506.98 | Avalanche wins by $248.37. |
| Debt A balance $8,000 | same model | Snowball First gone Debt A, month 17; 38 months; total interest $6,402.95; total paid $22,402.95 | Avalanche First gone Debt B, month 18; 36 months; total interest $5,181.54; total paid $21,181.54 | Avalanche wins by $1,221.41. |
The math is first-principles: each month the interest is the balance times the APR divided by 12, rounded to cents; the minimum is paid on every open debt; the remaining budget goes to the target debt, capped at what it still owes after its minimum; any leftover goes to the other debt. The winner is the lower total interest, stated in words — never a bare difference. What the model cannot do is predict YOUR rates: it assumes fixed APRs, equal monthly payments, and no new charges, fees, or rate changes for the whole payoff — real debts vary on all four. It does not model minimum payments that change as the balance falls, balance-transfer offers, or the motivation of quick wins — the snowball’s real advantage is psychological, and no calculator can price that. For one debt on its own, see the debt payoff calculator; for the loan version, see the loan payoff calculator; for a credit card specifically, see the credit card payoff calculator; and for the step-by-step payoff method, see the guide to calculating your debt payoff. This is a calculator, not financial advice.
Bright Side Kit. "Debt Snowball vs Avalanche: Which Pays Off Debt Faster?" https://brightoolbox.com/debt-snowball-vs-avalanche/ Accessed October 25, 2026.The avalanche, on the numbers. On the defaults — Debt A $3,000 at 18%, Debt B $8,000 at 24%, $600 a month — the avalanche costs $2,452.18 of interest against the snowball’s $2,761.98, so the avalanche wins by $309.80. Both take 23 months, so the difference is purely interest.
The smaller balance. The snowball targets the smaller debt first — Debt A ($3,000) here, gone in month 6 — whatever its rate. The avalanche targets the higher rate first — Debt B (24%) here, gone in month 18.
23 months either way. With Debt A $3,000 at 18% and Debt B $8,000 at 24%, a $600 monthly budget clears both debts in 23 months by either method — the avalanche just costs $309.80 less interest along the way.
$568 a month for the avalanche, $579 for the snowball. The smallest whole-dollar budget that gets the avalanche done in 24 months is $568 (interest $2,629.36); the snowball needs $579 (interest $2,893.73). One dollar less on either takes 25 months.
When the APRs are equal. With Debt A at 24% — the same as Debt B — the avalanche tie-break picks the same target as the snowball, so both methods are the same plan: Debt A gone in month 6, 24 months, $2,839.70 of interest, a tie.
Neither method finishes. At a $100 budget — the $50 minimums only — Debt B grows by about $110 a month because its $50 minimum is below its $160 monthly interest. A budget has to beat the minimums plus the interest to start paying the debts down.
Not on these debts. The avalanche wins on every branch on this page, from $21.84 at a $5,000 budget to $1,221.41 when Debt A is $8,000 — because the avalanche always attacks the higher rate first. The snowball’s edge is the quick win in month 6, not the interest.
Pick the avalanche for the lowest cost, the snowball for the quickest win. The avalanche saves $309.80 here; the snowball clears a debt in month 6 instead of month 18. If you need momentum to stay with the plan, the snowball’s early win can be worth more than $309.80 — the best method is the one you finish.