f = cf / p
o = ttt / tr2
rtt = t - (o * tr2)
rt = ttt / f
nf = f / ttt
Where,
f = Frequency
cf = System Clock Frequency
p = Prescaler Clock Value
o =Overflow Count
tr = Timer Resolution
ttt = Total Timer Ticks
rtt = Remainder Timer Ticks
rt = Real Time
nf = New Frequency
Calculator 
Formula 
