Why CAGR to simple return calculator need?

Suppose any investment growing 12% CAGR for 10 years tenure, then how to know what is simple return? we need some critical calculations.

What is the simple to CAGR return calculator formula?

a= CAGR return
b= Time in years
c= Time in months
d= Time in days
Total time in years, y
simple return in %, z
multiple value in times, x
y= b+c/12+d/365
z= ((1+0.01*a)^^(y)-1)*100
x= (1+1*0.01*z)