
1. Number of applications
The number of applications to be virtualized can be approximated by the number of virtual machines (VMs) of each type you plan to deploy

2. Virtualization host type
The virtualization hosts are the servers on which you will install the hypervisor and that you will use to run your virtualized applications
The server price on the left does not include shared storage (HBAs, SAN switches, disk), networking infrastructure (switches), electricity, cooling,
or space costs.
Servers B and C are more powerful servers that will typically run more virtual machines than Server A.
Server A - ($5,000 – 2 socket, dual-core processors, 32GB RAM, 3-5 network adapters)
Server B - ($6,000 – 2 socket, quad-core processors, 64GB RAM, 4-6 network adapters)
Server C - ($12,000 – 2 socket, six-core processors, 128GB RAM, 4-6 network adapters)
A minimum of 2 virtualization hosts is required for high availability or live migration.

3. Networked Storage Type
Type of shared storage that you plan to use for your virtual machines virtual disks
Fibre Channel SAN - assumes disk cost of $5/GB (cost for HBAs and SAN switches are additional and included in the total cost for storage).
iSCSI SAN - assumes disk cost of $3/GB.
NAS - assumes disk cost of $3/GB.

4. Compare to vendor
Citrix - compare cost per app of VMware vSphere 5.1 and vCenter Server vs. Citrix XenServer with XenCenter. Although vSphere and XenServer editions do not line up perfectly, this calculator will select the closest equivalent edition of XenServer based on the vSphere edition selected in the next field. The calculator will compare the following:
VMware vSphere 5.1 Enterprise Plus > Citrix XenServer Platinum
VMware vSphere 5.1 Enterprise > Citrix XenServer Enterprise
VMware vSphere 5.1 Standard > Citrix XenServer Advanced
VMware vSphere 5.1 Essentials Plus > Citrix XenServer Free
VMware vSphere 5.1 Essenials > Citrix XenServer Free
Microsoft - compare cost per app of VMware vSphere 5.1 and vCenter Server vs. Microsoft Windows Server 2012 with Hyper-V and System Center 2012. When appropriate, System Center 2012 Essentials will be selected.

5. Software Licensing
Essentials - provides an all-in-one solution for small offices (up to 3 hosts) to consolidate and manage many application workloads while reducing hardware and operating costs with a low up-front investment.
Essentials Plus - adds vMotion, high application availability and data protection for a complete server consolidation and business continuity solution for the small office IT environment (up to 3 hosts).
Standard - creates a solid foundation for consolidation of applications to slash hardware costs while accelerating application deployment.
Enterprise - eliminates downtime, protects data and automates resource management.
Enterprise Plus - delivers the full benefit of VMware vSphere and transform your IT infrastructure into the next generation of flexible, reliable IT services.

6. Management deployment
Virtualization management software (VMware vCenter, Microsoft System Center 2012, Citrix XenCenter) can be deployed either on physical servers or in virtual machines.
Physical - Most customers choose to deploy virtualization management on physical servers. However, for some smaller deployments, running management components in virtual machines can enable some additional cost savings.
Virtual - VMware vCenter and all Microsoft System Center 2012 or Citrix XenCenter components will be run in virtual machines. Management components will be run as virtual machines on each vendor’s hosts. Required databases will also be run in virtual machines.

7.Electricity
Low - $0.80/kWh (-20% of U.S. national average)
Average – $1.00/kWh (U.S. average)
High – $1.20/kWh (+20% of U.S. national average)
Using an Uninterruptable Power Supply can increase the power cost of your datacenter.

8.Real estate
Low - fully burdened datacenter real estate cost of $248/sqft. per year (-20% of U.S. average)
Average - fully burdened datacenter real estate cost of $310/sqft. per year (U.S. average)
High - fully burdened datacenter real estate cost of $372/sqft. per year (+20% of U.S. average)
Fully burdened datacenter real estate cost includes facility capital cost for space build-out, power and cooling equipment capital cost, and weighted depreciation