Definition of LOG: if x = 10^y, then y is said to be the log(base 10) of x
It is the number that 10 must be raised to to generate x
So if you know the log of a number (you know y), then you can find x using x
= 10^y
In Excel =10^A1
If you want natural logs replace 10 by e (exp(1))
Natural antilog =EXP(A1)
best wishes