Logarithm Calculator

Logarithm calculator

We are presenting the Logarithm calculator online to calculate the logarithm of any number with any base.

  1. Logarithm calculator
  2. Antilog calculator

Logarithm calculator

All you need to do is simply enter the base b and any number x and finally press the = button.


**Use e for scientific notation.

When the value of b y = x

Then the value of base b logarithm of the number x, logb x = y

Anti-logarithm calculator

In order to calculate log-1(y) on the calculator, enter the base b (10 is the default value, enter e for e constant), enter the logarithm value y and press the = or calculate button.


The anti logarithm or the inverse logarithm can simply be calculated by raising the value of base b to the logarithm y.

When the value of y = logb x

x = logb-1(y) = b y

The Rule of Logarithm

Rule of Logarithm product

logb(x × y) = logb(x) + logb(y)

Rule of Logarithm quotient

logb(x / y) = logb(x) – logb(y)

Rule of Logarithm power

logb(x y) = y × logb(x)

Rule of Logarithm base switch

logb(c) = 1 / logc(b)

Rule of Logarithm base change

logb(x) = logc(x) / logc(b)

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