Container Resource Calculator

Pod Resource Sizing

Calculate resource requests and limits for Kubernetes pods

Avg CPU Usage (millicores)

Peak CPU Usage (millicores)

Avg Memory Usage (MB)

Peak Memory Usage (MB)

Number of Replicas

Headroom

Cluster Capacity Planning

Calculate how many pods fit on a cluster

Number of Nodes

CPU Cores per Node

RAM per Node (GB)

System Reserved (%)

CPU Request per Pod (m)

Memory Request per Pod (MB)

Formula

Request = Avg Usage x Headroom | Limit = Peak Usage x Headroom | Max Pods = min(Available CPU / Pod CPU, Available Mem / Pod Mem)

Frequently Asked Questions

What is the difference between requests and limits?

Requests are the guaranteed resources a container gets -- the scheduler uses requests to place pods on nodes. Limits are the maximum resources a container can use. If a container exceeds its memory limit, it is OOM-killed. If it exceeds CPU limit, it is throttled. Set requests to average usage and limits to peak usage.

How should I size my containers?

Start by monitoring actual usage in staging/production. Set requests to the 90th percentile of normal usage plus 20-25% headroom. Set limits to observed peak usage plus 25-50% buffer. Under-requesting wastes cluster resources. Under-limiting causes noisy neighbor issues. Over-limiting causes unnecessary OOM kills.

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