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The Log Base 2 Calculator is used to calculate the log base 2 of a number x, which is generally written as lb(x) or log_{2}(x).

Log base 2, also known as the binary logarithm, is the logarithm to the base 2. The binary logarithm of x is the power to which the number 2 must be raised to obtain the value x. For example, the binary logarithm of 1 is 0, the binary logarithm of 2 is 1 and the binary logarithm of 4 is 2. It is often used in computer science and information theory.