Kubernetes resource planner

How to use this application

Use the Kubernetes resource planner to compare the CPU and memory quantities you intend to assign to regular containers in a replicated Pod. Add one row for each regular container, enter its request and limit, and choose the number of identical Pod replicas. Calculate totals to see both the specified resources per Pod and the combined quantities across replicas. The planner highlights a request that exceeds its corresponding limit rather than presenting an inconsistent total.

CPU accepts decimal cores or the m suffix for millicores. For example, 0.5 and 500m represent the same CPU amount. CPU values finer than one millicore are rejected. Memory accepts byte counts, decimal suffixes k, M, G, T, P and E, or binary suffixes Ki, Mi, Gi, Ti, Pi and Ei. Case matters: 128M and 128Mi represent different byte counts. A lowercase m in a memory field is flagged because it means millibytes, a common typing mistake when Mi was intended. Fractional memory amounts round upward to a whole byte. Byte totals use integer arithmetic; the accompanying MiB display truncates after six decimal places.

Load the example to try a web container requesting 500m CPU and 256Mi memory alongside a sidecar requesting 250m and 128Mi. Three replicas produce 2250m of specified CPU requests and 1,207,959,552 bytes of specified memory requests, equivalent to 1152Mi. Change a value and the previous result disappears until you calculate again. Clear all removes the entries and restores one empty container row.

Blank quantities remain unspecified. The totals include only entered amounts and are marked partial when fields are blank. Kubernetes can apply defaults, including requests derived from limits or rules supplied by admission configuration; this planner does not simulate those defaults. It covers regular containers with identical replicas, not init-container scheduling, sidecar-init behavior, Pod overhead, Pod-level resources, LimitRange, ResourceQuota, node allocatable capacity, autoscaling, or actual utilization. It does not determine whether a workload will fit on a cluster or recommend safe production resource settings. Scientific notation, signed quantities and more than nine decimal places are outside this interface’s supported input subset. Limits must be positive or left empty; requests may be zero.

Up to eight containers and 10,000 replicas are supported. Each CPU field is bounded at 100,000 cores and each memory field at one EiB. These are interface bounds, not Kubernetes capacity limits. Names are optional display labels and are shown as text; no cluster connection or manifest upload is required. Everything entered remains in temporary page memory. Reloading or closing the page clears it. No account, browser persistence or remote calculation is used.

The unit conventions follow the Kubernetes documentation on resource management for Pods and containers. Consult that documentation and your cluster’s policies before applying a configuration. This tool is an arithmetic preparation aid, with explicit assumptions and limits, rather than a replacement for admission validation or a workload measurement exercise.

Reference: Kubernetes resource management documentation.