Kubernetes
Kubernetes Cluster Capacity Calculator
Enter node specs, count, and system reservation percentage to compute total allocatable CPU and memory, max schedulable pods, and DaemonSet overhead.
No data is transmitted — everything runs locallyTool
Example — 3 nodes × 4 vCPU/16 GB · 10 pods at 250m/512MB
Allocatable CPU
10.2 cores
Allocatable Memory
41 GB
CPU Utilization
25%
Memory Utilization
12%
About this tool
Kubernetes Cluster Capacity Calculator
The Kubernetes Cluster Capacity Calculator computes allocatable CPU and memory from node specs and system reservation, with schedulable pod count at target utilization.
• Calculate how many pods fit on a cluster before scaling the node pool
• Determine node count needed for a given workload CPU and memory requirement
• Account for DaemonSet and system overhead when planning cluster capacity
• Model utilization headroom needed for autoscaler to avoid pod pending states
Affiliate disclosure
Sponsored tool. This tool is brought to you by our partners. No data is collected or transmitted.View Kubernetes certification details
FAQ
What does this tool tell you?
The Kubernetes Cluster Capacity Calculator computes allocatable CPU and memory from node specs and system reservation, with schedulable pod count at target utilization.
What affects the result most?
Allocatable resources: node capacity minus kube-reserved and system-reserved. Bin packing efficiency: actual pod scheduling vs theoretical maximum given resource fragmentation. Node autoscaler headroom: how many pending pods can be handled before autoscaler triggers.
How should I use the result?
The calculation is deterministic — the same inputs always produce the same output — so the most useful workflow is to vary one input at a time and see which factor moves the result most. That tells you where to focus your attention before committing to a decision.