How to Calculate Right Size Of Office Space

Planning the right size of office space needs  calculation according to need as it is not just about work space, several other factors do matter most , like how much space the employer wants to allocate to employees cubicles, meeting room, common area, recreational area, video conferencing rooms.

Office Size : Floor Area Needed Per Person

The law says that you must allow for 40 square feet per person; however, this is the legal minimum you’re required to provide. 
It look like it is more space but if you see number of  persons sitting ,it will be crowded.
Dividing 100 sq ft per person permits 50 sq ft for working area and another 50 to accommodate room in common areas such as conference areas, and canteens. 
Workplace:                     120 to 300 square feet based on the employee
Free-area Workspaces: 40 to 100 square feet per person
Check-in Area:                150 to 400 square feet
Meeting Room:               250 to 450 square feet
Work Room:                   100 to 300 square feet
Break Room:                  140 to 300 square feet
Storage Room:               60 to 200 square feet

Extra Area needed for office space

Kitchen: everyone needs a minimum caffeine intake.   
Lounge: Huge for all hands and party style guest seating.   
Storage: for all businesses that needs file or server storing if you are not cloud-based.   
Showers: recommends healthy shuttle options via biking or jogging, or midday runs.   
Wellness: backs new moms with a personal space.   
Library: promotes employees to proceed education in a cost-effective means.There’s several focus on the futurity of work and how employees’ work methods are evolving.

For example, a 25-person company with average space requirements would need an estimated 6,250 square feet (25 people x 250 square feet per employee).