Over a week ago I wrote an article around how to size your Virtual SAN Datastore. I included an equation to help everyone who is going through the same exercise. I figured I should be able to make life even easier by creating a simple Virtual SAN Datastore calculator based on this equation.
<EDIT> VMware has launched a great calculator. My tool served as a temporary solution as there was no calculator available, now that there is I highly recommend using the official tool: http://virtualsansizing.vmware.com/ </EDIT>