Calculate logarithm value using log method of Java Math class

Calculate logarithm value example shows how to calculate natural logarithm values using the log method of Java Math class.

How to calculate natural logarithm value in Java?

We can use the static log method of the Math class to calculate logarithm values in Java.

1	public static double log(double x)

This method returns the natural logarithm value (base e) of the argument double number.

package com.javacodeexamples.mathexamples;

public class FindNaturalLogExample {

public static void main(String[] args){

double d = 3;

System.out.println("Natural Logarithm value is: " + Math.log(d));

}

Output

1	Natural Logarithm value is: 1.0986122886681098

Thelog method of the Math class uses base e. If you want to calculate log base 10 use the following code.

double number = 5;

double logValue = Math.log(number) / Math.log(10);

System.out.println("Log base 10 is: " + logValue);

Output

1	Log base 10 is: 0.6989700043360187

Java version 1.5 introduced a new method log10 which calculates log value using base 10.

double number = 5;

double logValue = Math.log10(number);

System.out.println("Log base 10 is: " + logValue);

Output

1	Log base 10 is: 0.6989700043360187

Use the following code to calculate log value base 2 in Java.

double number = 20;

double logValue = Math.log(number) / Math.log(2);

System.out.println("Log value base 2 is: " + logValue);

Output

1	Log value base 2 is: 4.321928094887363

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