Hey ,
Here is the retention Rate formula :
% Retention Rate (RR) = 100 - [ {S-(UT+BT)}/AE x 100]
Where:
RR = Retention Rate
S = Total Number of terminations from what ever cause (In effect this means the total number employees that have left the company for what ever reason)
UT = Unavoidable Terminations (i.e. retirements or long term illness)
BT = Beneficial Terminations (i.e. sometimes those staff that do leave provide benefit to the company by virtue of leaving, for example under performers
AE = The average number of employees working for the company during the same period as calculated, this should be any period of 12 months.
Hope you will find this useful.
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Priyanka