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Avalanche vs snowball
Debt Payoff Calculator
Enter several debts and one monthly budget. The page compares highest-rate-first avalanche against smallest-balance-first snowball.
Calculator
Debt Payoff Calculator
Change a number and the answer, chart, report, code snippets and worksheet all recalculate from the same inputs.
Answer
result35 mo
Avalanche pays off in 35 months with $2,784.51 interest; snowball pays off in 36 months with $3,012.00 interest.
Avalanche
Snowball
Use it in code
Recreate this result
debts = [{"name":"Card A","balance":5000,"apr":22,"minimum":150},{"name":"Card B","balance":2400,"apr":18,"minimum":75},{"name":"Loan","balance":9000,"apr":8,"minimum":240}]
budget = 650
def cents(value):
return round(value + 1e-9, 2)
def plan(mode):
rows = [dict(d) for d in debts]
minimums = sum(d["minimum"] for d in rows)
interest_total = 0
months = 0
while months < 720 and any(d["balance"] > 0.005 for d in rows):
months += 1
for d in rows:
if d["balance"] > 0.005:
charge = cents(d["balance"] * d["apr"] / 100 / 12)
d["balance"] = cents(d["balance"] + charge)
interest_total = cents(interest_total + charge)
extra = max(0, budget - minimums)
for d in rows:
if d["balance"] > 0.005:
pay = min(d["balance"], d["minimum"])
d["balance"] = cents(d["balance"] - pay)
while extra > 0.005 and any(d["balance"] > 0.005 for d in rows):
active = sorted([d for d in rows if d["balance"] > 0.005], key=lambda d: -d["apr"] if mode == "avalanche" else d["balance"])[0]
pay = min(active["balance"], extra)
active["balance"] = cents(active["balance"] - pay)
extra = cents(extra - pay)
return months, interest_total
for mode in ("avalanche", "snowball"):
months, interest = plan(mode)
print(f"{mode}_months={months}")
print(f"{mode}_interest={interest:.2f}")
The snippets use the current inputs and print the same headline result, rounded for display.
Print room
One-page worksheet
The worksheet records the inputs, result, reference formula and a short checklist for comparing real quotes or statements.
The model repeats month by month so interest, payments and balances stay traceable.
Checklist
Compare this worksheet with dated lender, payroll or account documents. Circle any rate, fee, tax or deduction that is estimated rather than confirmed.
Method
How this calculator earns its page
Search intent: Best answer for choosing a payoff order across several debts with different balances, APRs and minimums.
Nearest sibling: Near-overlap with debt-snowball-avalanche-calculator should be reviewed by Claude; this page is the interactive comparison target in this batch.
Avalanche sends extra money to the highest APR first. Mathematically, that usually minimizes interest because each extra dollar attacks the most expensive balance. Snowball sends extra money to the smallest balance first, which can create faster account closures even when it costs more interest.
The model protects minimum payments first. Only the budget above all minimums is assigned by the strategy. That makes the comparison fair: both plans spend the same monthly total and differ only in order.
The side-by-side chart matters because payoff strategies are emotional as well as arithmetic. Seeing both timelines lets a user decide whether the interest saving is worth a slower first account payoff.
The important habit is to separate the engine from the framing. A loan page, mortgage page and affordability page can share amortization maths, but the question is different: one asks what a debt costs, one asks how a home loan behaves with housing add-ons, and one asks what price fits an income limit. That is why each page names its single intent and shows the result in the visual form a user would expect for that job. The second habit is to keep the trust boundary visible. The calculator shows the arithmetic it can prove from the current inputs; the worksheet and code panel make that arithmetic repeatable; the user still needs to compare the result with dated lender, payroll, account, tax or statement documents before treating the number as a commitment.
Common mistakes
What to check before trusting the number
Mixing quote types
Compare APR to APR, gross pay to gross pay, and after-tax pay to after-tax pay. A low monthly payment can hide a longer term or a larger balance.
Leaving fees outside the model
Origination fees, account fees, insurance, escrow, taxes and payroll deductions can change the real cash flow. Add known monthly costs before making a decision.
Forgetting that rates move
The calculator is a fixed-rate planning model unless a page says otherwise. Variable rates, promotions and penalty APRs need a scenario range, not a single answer.
Treating guidance as advice
Rules of thumb such as 28/36 DTI and 4% withdrawals are labelled planning heuristics. They are not lender approvals, tax advice or retirement advice.
FAQ
Questions people ask about debt payoff calculator
Why does the result differ from my lender or payroll system?
Real systems may use daily interest, exact closing dates, fees, escrow rules, local taxes or paycheck calendars. This page shows the transparent core calculation so those differences are easier to spot.
Can I use the code snippet in a spreadsheet workflow?
Yes. The snippets use standard library arithmetic and print the same headline answer, so you can paste the logic into a local check or adapt it for a spreadsheet.
Are taxes included?
Only pages that explicitly ask for tax inputs include them. Salary and take-home pay use a labelled US federal or flat-rate mode; loan pages do not fabricate local tax tables.
Why are there sliders and typed boxes?
The typed box lets you enter exact values. The slider lets you test sensitivity quickly and proves that the chart is driven by the current input.
Does this replace professional advice?
No. It is an arithmetic tool for planning and checking quotes. Final lending, payroll, tax and investment decisions need the official document or qualified advice.
What should I copy into the report?
Use Copy full report after setting the inputs. It includes the page URL, current assumptions, input values and displayed results in Markdown.
Why does the result differ from my lender or payroll system?
Real systems may use daily interest, exact closing dates, fees, escrow rules, local taxes or paycheck calendars. This page shows the transparent core calculation so those differences are easier to spot.
Can I use the code snippet in a spreadsheet workflow?
Yes. The snippets use standard library arithmetic and print the same headline answer, so you can paste the logic into a local check or adapt it for a spreadsheet.
Are taxes included?
Only pages that explicitly ask for tax inputs include them. Salary and take-home pay use a labelled US federal or flat-rate mode; loan pages do not fabricate local tax tables.
Why are there sliders and typed boxes?
The typed box lets you enter exact values. The slider lets you test sensitivity quickly and proves that the chart is driven by the current input.
Does this replace professional advice?
No. It is an arithmetic tool for planning and checking quotes. Final lending, payroll, tax and investment decisions need the official document or qualified advice.
What should I copy into the report?
Use Copy full report after setting the inputs. It includes the page URL, current assumptions, input values and displayed results in Markdown.
Certification notes
Source, method and limitation basis
Phase 5 finance tranche page with live inputs, visual proof, code snippets, report copy and worksheet. Reviewed 2026-09-22.
Model limits
This calculator is an educational planning model. It does not include every lender fee, payroll deduction, local tax, underwriting rule, statement date or professional recommendation.
Assumptions
Planning estimates use fixed inputs and rounded display values.
Loan examples use monthly compounding and end-of-month payments unless the page says otherwise.
Tax examples use the labelled US federal or flat-rate mode only.
Cite this page
Use the canonical URL, the page title “Debt Payoff Calculator - CalculationTime”, and the review date 2026-09-22.