Question : Problem: How do i calculate the BTU requirement for my server room?

can you please tell me about a website that will help me calculate the BTU requirement?

We have about 7 dell servers 2 UPS 2 router 2 firewalls AS400

Answer : Problem: How do i calculate the BTU requirement for my server room?

Never heard a figure that high for office workers.  I've seen from 190BTU/hr latent to 220-275BTU/hr sensible.  100W in the spreadsheet was conservative, yielding 340-350BTU/hr per person.

Most office workers and network admins would be not be considered in the labor category.  I would consider them a person at rest.

Are you figuring for active personnel in a closed space?  Bench work would be right at around 450 BTU/hr.  Standing labor more.  Active lifting/loading or heavy physical would be higher, especially given the humidity that would have to be offset.

For a server closet, all equipment is factored separate from personnel.  Same goes for lighting.  Round numbers offered by resellers of air conditioners try to roll this into one number.

They make rough numbers of 500BTU/hr per person in order to have a "margin" for lighting and equipment.  The margin is always on the plus side, but you have to remember that they want to sell a higher rated wall or split unit.

An engineer can factor the loads.  Don't forget that your environmental conditions and HVAC provided in the surrounding office space may be as much of a factor as the equipment itself.