You need to compute logarithms in your calculations but aren't familiar with Excel's support for such calculations.
Excel provides nine builtin functions for computing logarithms and one exponential function (excluding the special class of exponential functions known as hyperbolic functions, for which Excel provides six builtin functions). A few of these logarithm functions are related to the lognormal probability distribution, while others are related to complex numbers. See Chapter 6 for recipes dealing with probability and check out Recipe 7.13 for dealing with complex numbers. Read the following discussion to learn about the remaining logarithmic functions .
Table 74 shows several of Excel's builtin logarithmic and exponential functions.
Table 74. Common logarithmic and exponential functions
Function 
Syntax 
Description 



Returns the log of the number n to the specified base 


Returns the log of the number n to the base 10 


Returns the natural logarithm of n 


Returns e^{ n } 


Returns n
^{
p
} and is the same as the syntax n



Returns (e^{ n }  e^{ n })/2 


Returns (e^{ n } + e^{ n })/2 


Returns (e^{ n }  e^{ n }) / (e^{ n } + e^{ n }) 


Returns the inverse hyperbolic sine, ln(n + sqrt( ... 
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