vCPU to pCPU Ratio Calculator
The vCPU to pCPU Ratio Calculator helps you estimate CPU overcommitment in virtualised environments by comparing total assigned virtual CPUs to the available physical CPU cores in a host or cluster. Enter the number of hosts, physical CPUs per host, cores per CPU, threads per core, and total assigned vCPUs to instantly calculate your oversubscription ratio. Advanced options let you toggle between physical cores and logical threads for the ratio denominator, reserve hosts for failover capacity, and set a target maximum ratio to check whether your allocation is within acceptable bounds. The tool provides clear guidance on oversubscription levels — light, moderate, or high — along with a visual meter and target status indicator. Presets for conservative clusters, general VM workloads, dense virtualisation, and VDI scenarios help you model common deployment patterns quickly. Ideal for capacity planning, procurement discussions, and infrastructure reviews. All calculations run entirely in your browser — no data is transmitted externally.