Windows Server Virtualization Calculators
The Windows Server Virtualization Calculators provide two ways to estimate the number and cost of Windows Server Standard Edition, Enterprise Edition and Datacenter Edition licenses needed for your virtualization scenarios to help you determine the most cost-effective edition of Windows Server.
Calculator 1 is designed to estimate the licenses and cost of Windows Server by editions and numerous Microsoft server products on a single, physical server.
Calculator 2 is designed to estimate the licenses and cost of only Windows Server by edition for one or multiple physical servers.
The calculators are pre-populated with the US dollar Open agreement Estimated Retail Prices that you can update with your organization's prices for more accurate estimates.
https://www.microsoft.com/windowsserver2008/en/us/hyperv-calculators.aspx