cisco 9166i access point capacity

[sb71365]

how many users can connect in one access point with how many meters coverage with omni direction
model # Cisco 9166I

[Leo Laohoo]

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@sb71365 wrote:

how many users can connect in one access point with how many meters coverage with omni direction
model # Cisco 9166I

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With such limited information, we recommend getting a wireless site survey (aka wireless AP placement or wireless design) done professionally.

[sb71365]

Can you please let me know the required points to understand a bit more on
this ?

[Leo Laohoo]

Anyone can easily make a wrong wireless design cheap, however, correcting an incorrect wireless design is where the big money is.  

Think about it.

[marce1000]

  - Some parameters related to coverage may be available in https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9166-series-access-points/catalyst-9166-series-access-points-ds.html
                In practice as environmental circumstances differ ; you need a site survey , 

 M.

[Rich R]

Max clients per radio is 200 https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/17-9/config-guide/b_wl_17_9_cg/m_client_limit_ewlc.html but you would never actually load the AP to that limit if you expect to deliver an acceptable level of service.  The client capacity really depends on a whole number of factors - but mainly the type of client and traffic levels they will generate.  Even if the radio can handle that many clients they will be competing for the same radio airtime so it's never wise to load the AP anywhere near to the limits.
Meraki provides some guidance on calculating how many APs you will need: https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/Best_Practice_Design_-_MR_Wireless

The radiation pattern is in the data sheet which @marce1000 linked above but actual coverage will depend on AP location, channels used, power levels and physical environment so as the others have said get a professional wireless installer site survey done.  Like Leo says if you get it wrong you'll have unhappy users complaining about a rubbish service so it's best to get it done right first time.