Bathroom Size

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As per Home Ventilation Institute 

Bathroom Size                         Minimum Ventilation (CFM) Required*

Less than 50 sq. feet                  50 CFM OR 25 LPS     (50 sq. feet  = 4.645 square meter)

                                                                       (100sq.feet = 9.29 squrare meter)

50-100 sq. feet                           1 CFM  = 1 per sqare  foot of floor space

More than 100 sq. feet                     Add the CFM requirement for each fixture:
                                                               Toilet 50 CFM
                                                               Shower 50 CFM
                                                               Bathtub 50 CFM


Example
  
Toilet                                         1.8 M X 2.2 M = 3.69 M2 so 50 CFM is enough as  per Home Ventilation Institute 


Space Area for Lav or wash basin area   3M X 4M = 12M2 OR  129 sq.feet . its mean 130 CFM