VMware introduced a easy to use vSAN Sizer for Data Center Scale Deployments. Just make your data ready and login with your my.vmware account and your are good to go.
The sizing recommendation is divided into 3 sections.
Section -1: Details of the total number of servers for the vSAN cluster. The total raw storage, the total usable storage and best match ReadyNode™. The information provided in this section pertains to the entire cluster
Section:2 This section provides CPU, Memory, Cache, Capacity and Disk Group details per server
Section:3 This section provides Cache and Capacity details per disk group
The rest of the sections provide details on the other assumptions that were considered while Sizing.