Kubernetes Resource Calculator

Turn replica count and per-pod CPU/memory requests into cluster demand and a recommended node count with utilization headroom.

Translate workload requests into total cluster demand and a recommended node count with utilization headroom.

Replicas (pods) CPU request / pod cores CPU limit / pod cores Memory request / pod MiB Memory limit / pod MiB Node allocatable CPU cores Node allocatable memory GiB Target node utilization %

Uses requests for scheduling math (what the scheduler packs). DaemonSets, system reserved CPU/memory, and PodDisruptionBudgets can force additional nodes.

Requests vs Limits

Requests drive scheduling — the calculator packs on requests.
Limits cap bursts (CPU throttle / OOM). Huge limit≫request ratios can surprise you under contention.

Reading The Result

The tool computes nodes required by CPU and by memory at your target utilization (often 60–75% for production headroom), then takes the max.

Also reserve capacity for:

DaemonSets and system pods
Rolling updates / surge
Zone imbalance and node failures

Node allocatable values (not raw instance size) are what matter — enter those.