Hyper-V Consolidation Calculator
Calculate Hyper-V host requirements with HA and Windows licensing
How to use Hyper-V Consolidation Calculator
- 1Enter your current count of physical servers and their average CPU/RAM usage.
- 2Enter the target Hyper-V host size and desired reserve headroom.
- 3Read the projected host count, consolidation ratio and freed rack units.
Hyper-V consolidation planning
hosts = ceil(totalLoad / (hostCap × (1 - reserve))); ratio = physicalServers / hostsHyper-V lets you collapse many lightly used physical boxes onto a few hosts running Windows Server with the Hyper-V role.
Keeping 15–25% headroom per host preserves live-migration capacity so maintenance or a host failure never disrupts running VMs.
Frequently asked questions
What reserve should each host keep?
Plan 15–25% free so failover clusters can absorb a downed node without overcommit.
Core licensing implications?
Windows Server is licensed per core, so larger hosts raise OS license cost even as VM count drops.
Is failover clustering required?
Not required, but it is what makes consolidation safe by allowing automatic VM restart.
More Tools
VM Storage Calculator
Calculate vSphere ESX cluster storage capacity requirements
Kubernetes Capacity Calculator
Calculate Kubernetes cluster node requirements for your workload
Server Virtualization Calculator
Calculate ESX host requirements for VM workloads
VMware Licensing Calculator
Calculate VMware VCF/VVF licensing costs