Free, fast calculators for DevOps and cloud engineers

Small, focused tools for the questions you look up every week: subnet math, pod sizing, cron schedules.

Runs in your browser
No sign-up, no tracking cookies
Based on official docs

Networking

Terraform cidrsubnet calculator

Evaluate cidrsubnet() and plan VPC subnets, with copy-ready HCL.

AWS VPC subnet planner

Plan per-AZ subnets by tier with room to grow, plus Terraform.

Kubernetes

Kubernetes pod capacity calculator

How many pods fit per node, and how many nodes you need.

CI/CD

GitHub Actions cron schedule checker

Cron in plain English, next runs in any time zone, and gotchas.