Worked Examples

9 worked engineering examples showing real calculator inputs, outputs, and interpretations. Each example ties back to a hand-verified production tool.

Application Security

Password Entropy and Bcrypt Cost Factor 12 Example

Example of password entropy bits and bcrypt cost factor 12 hash time for production password storage.

Cost & FinOps

Cloud Waste Audit $25K Bill Idle and Oversized Resources Example

Example of identifying cloud waste in a $25,000 monthly AWS bill — idle instances, oversized resources, unattached EBS volumes.

Databases

PgBouncer Pool Size 100 Connections Configuration Example

Example of configuring PgBouncer pool size to handle 500 application connections with only 100 Postgres server connections.

Postgres Partition Strategy for 500M Row Time Series Example

Example of setting up monthly range partitioning for a 500M row Postgres time series table.

Kubernetes

Kubernetes Cluster Capacity 3-Node 4vCPU 16GB Example

Example of calculating allocatable Kubernetes cluster capacity for 3 nodes with 4 vCPU and 16 GB RAM each.

Observability

Alert Fatigue Calculator: 150 Alerts/Week Actionability Score

Calculate alert fatigue risk when a 4-person on-call team receives 150 alerts per week.

SRE

MTTR Production Incidents Q1: Calculation and Analysis | MTTR Calculator

Calculate Mean Time to Recover (MTTR) from Q1 production incident data.

SLO 99.9% Error Budget: 25 Minutes Consumed Calculation | Error Budget Calculator

Calculate the percentage of a 99.9% monthly SLO error budget consumed by a 25-minute incident.

SRE Toil: Manual Deployment Automation ROI | Toil Calculator

Calculate the toil burden of manual deployments and the ROI of automating them.