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Credential Stuffing Downtime Cost Estimator

This estimator calculates the annual operational cost of downtime associated with credential stuffing incidents. It combines lost employee productivity, revenue or service impact, and incident-response expense so teams can evaluate more than the direct fraud value.

The model is appropriate when account lockouts, authentication throttling, customer-support surges, or emergency remediation disrupt normal operations. Results can be used to compare authentication controls, capacity improvements, and response automation. Avoid counting the same cost in multiple fields; for example, do not place responder labor in both loaded labor cost and response cost unless they represent different groups.

Enter your assumptions

incidents
hours
users
USD
USD
USD
Result
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Annual downtime cost
Productivity cost—
Revenue/service impact—
Response cost—

1. Estimate annual incidents

Count distinct credential stuffing events that materially disrupt authentication or operations.

2. Enter downtime per incident

Use the average period during which affected work or service is impaired.

3. Add affected users and labor cost

Enter productive users and their loaded hourly cost for internal productivity loss.

4. Add hourly service impact

Use lost contribution, service credits, or another documented hourly business impact.

5. Add response cost

Include incident-specific external services, overtime, or other costs not already counted.

6. Review annual cost

Compare productivity, service, and response components with the total.

Productivity cost = Incidents × Downtime hours × Affected users × Hourly labor cost Service impact = Incidents × Downtime hours × Impact per hour Response cost = Incidents × Response cost per incident Annual downtime cost = Productivity cost + Service impact + Response cost

The calculation uses average values and assumes each incident has the same duration and scope.

What the result means

Use the result as a scenario-based planning estimate. Compare several plausible inputs rather than relying on one point value.

This calculator does not replace a formal risk assessment, incident analysis, legal advice, or financial advice.

Given: 8 incidents, 3.5 downtime hours, 35 users, $52 hourly labor cost, $4,200 hourly service impact, and $3,800 response cost per incident.

Calculation: Productivity = 8 × 3.5 × 35 × $52 = $50,960. Service impact = 8 × 3.5 × $4,200 = $117,600. Response = 8 × $3,800 = $30,400. Total = $198,960.

Result: Estimated annual downtime cost is $198,960.

What counts as downtime for credential stuffing?

It can include unavailable login services, severe latency, forced lockouts, or a business process that cannot proceed normally.

Should customer time be valued as labor cost?

Usually not in the employee productivity field. Customer impact can be reflected in hourly service impact, churn analysis, or a separate model.

How do I avoid double counting?

Assign each cost to one component and document what is included. Keep response labor out of productivity cost when it is already included in response cost.

Can I model partial degradation?

Yes. Convert partial impairment into equivalent full-impact hours or reduce the hourly service impact.

Does this include fraud losses?

Only if you intentionally include them in response cost or hourly impact. For account-abuse losses, use the expected loss estimator separately.