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# Base 2 logarithm of 690?| Log2 Calculator

Here is the answer to questions like: Base 2 logarithm of 690? or what is the base 2 log of 690?

Use the | Log2 calculator below to find the logarithm of any positive number for any number base you enter.

### Logarithm Calculator

 Please enter the base (b) and a positive number (n) to calculate logbn: The base  log of  = ? Result: The base 2 logarithm of 690 is 9.4304525516655 or log2690 = 9.4304525516655. Notes: i) e and pi are accepted values. ii) 1.2 x 103 should be entered as 1.2e3 and iii) 1.2 x 10-3 as 1.2e-3

## What is logarithm?

A logarithm is the power to which a number must be raised in order to get some other number. In other words, the logarithm tells us how many of one number should be multiplied to get another number.

For example:

• The base 2 logarithm of 4 is 2, because 2 raised to the power of 2 is 4:
• log3 9 = 2, because 32 = 9

This is an example of a base-3 logarithm. We call it a base-3 logarithm because 3 is the number that is raised to a power.

The most common logarithms are natural logarithms and base 10 logarithms. There are special notations for them:

• A base 10 log is written simply log.
• A natural logarithm is written simply as ln.

So, the notation log alone means base ten logarithm and notation ln, means natural log.

## Basic Log Rules

• logb(xÂ·y) = logb(x) + logb(y)
• logbx/y) = logb(x) - logb(y)
• logb(xy) = yÂ·logb(x)
• logb(x) = logk(x)/logk(b)