I can tell you that when we built out our data center, it came down to the fact that the CRAC tonnage available sizing made it clear that we didnt need to measure too carefully, because there was no perfect CRAC for just your load. You get the bigger one, and thn we were N+1, or maybe N+2, or N+3 if we open up the doors and use fans.
Most of our draw is using 208V from 3 phase UPS. When you increase the voltage, you decrease the amps and increase the efficiency of the power supplies, so you generate less waste heat. We also have 110V for devices that doen't accept the higher voltage.
I am guessing that perhaps you are looking at 10 racks, each with 2 circuits?
We went with Starline Track Busway, which allows you to deliver 208V and 110V without having to reconfigure circuits at the electrical panel. Not that we have ever had to change it since we went in 6 years ago.
It looks like you have enough load to justify 2 large UPS to power the entire room.
I use two different color power cords so we know that each device is plugged into 2 different PDU, and that each PDU is fed by a separate UPS. All cords on a PDU should be a single color. Each device has 2 different color cords. Very easy to see visually if things are wrong.