Calculator 1
Calculator 1 lets you interactively build virtual machines running multiple Microsoft server products to estimate the licenses and costs for Windows Server by edition (Standard, Enterprise and Datacenter) and many Microsoft server products. It starts with configuring your server based on virtualization technology, sockets and clustering requirements, and then builds the virtual machines.

Calculator 2
Calculator 2 provides 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.

You can use one of two models; grouping servers by the # of processors and average # of VMs, or listing each of the servers individually.