Step 1
Readiness equals 0.40 times evidence strength, plus 0.25 times message fit, plus 0.20 times response discipline, plus 0.15 times fallback quality.
Public tool method · Version 1.0.0
Spend-at-Risk Calculator
Use this method when you need to answer: How much planned growth spend is exposed to weak evidence or message fit? It turns the evidence you supply into a Spend exposure model by applying explicit, versioned decision rules. The result is not a benchmark or certification. It shows the strongest evidence, riskiest input, next action, owner, and review date so another reader can inspect and challenge the decision.
Last material review 2026-08-08 · Next review 2027-02-04
Question answered
How much planned growth spend is exposed to weak evidence or message fit?
The model estimates exposure from planned spend and four readiness factors normalized from zero to one.
Step 2
Estimated exposure rate equals one minus readiness.
Step 3
Spend at risk equals planned spend multiplied by estimated exposure rate.
Step 4
Exposure at or above 60% produces Stop; 35% to under 60% produces Test first; below 35% produces Spend now.
Step 5
Record the required inputs and label missing or estimated evidence before classification.
Assumptions and limits
- The result is a decision estimate, not a forecast or financial advice.
Usefulness hypothesis
A visible dollar estimate changes when a team tests evidence before increasing spend.
Primary metric: Exposure-model export or Relevancy Audit handoff
Worked example and modes
The same method, preserved entry intent.
- Scenario
- Q4 category launch
- Planned Spend
- 350000
- Evidence Strength
- 2
- Message Fit
- 3
- Response Discipline
- 2
- Test Coverage
- One landing-page test with no buyer interviews
Distribution package
Use, embed, and share the instrument.
Blank CSV template90-second demonstrationThree share treatmentsPlain-language answer
Embed with canonical attribution
<iframe src="https://petrichorgrowth.com/tools/the-outspend-trap/embed.html" title="Spend-at-Risk Calculator" loading="lazy" width="100%" height="900"></iframe>
<p>Source: <a href="https://petrichorgrowth.com/tools/the-outspend-trap">Spend-at-Risk Calculator by Petrichor</a></p>Ownership and change control
Who keeps the result defensible?
Product
Petrichor product
Method
Petrichor strategy
Evidence
Petrichor research
Privacy
Petrichor operations
Security
Petrichor web platform
Distribution
Petrichor growth
Support
Petrichor client experience
A material method change requires a reason, impact note, fixture rerun, semantic-version increment, and public entry in the method change log.
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Authority Ledger
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Related plain-language answers
Reach Reality answerAI Skill Assurance answerAuthority Ledger answer
Method questions
What another reader should know.
What does the Spend-at-Risk Calculator method produce?
A versioned Spend exposure model with visible reasoning, evidence status, next action, ownership, and review date.
What inputs does Spend-at-Risk Calculator require?
Only the structured decision evidence named by the instrument. Missing or estimated inputs remain visible in the result.
Does the method use AI or a cross-customer benchmark?
No. It applies deterministic rules to the user's inputs and does not compare one customer with another.
When is the method reviewed or changed?
The current method is reviewed at least every 180 days. Material changes require new fixtures, a version increment, and a public change note.
When should the artifact move into facilitated work?
When the unresolved decision requires team challenge, evidence reconciliation, dissent, ownership, and an organizational commitment.