I work at a smaller company, and here we convert the $ price to a number of shares by taking the 100 day VWAP of the stock from the date of the board meeting where your grant is approved.
VWAP == Volume Weighted Average Price
When I joined I got a random email that said “your rsu $ to shares conversion was X shares and here’s your schedule” and my schedule is all in # of shares not $
ESPP-like programs, on the other hand, are always dollar denominated and exchanged at a set rate at the end of the offering period.
The first way makes employees lose out on an average of 2 years of stock growth.