Inverse Log Calculator

Enter a number and a base into the calculator. The calculator will display the inverse log of the number and base entered. The base of the natural log is equal to e=2.71828. The standard base for log is base 10.

Inverse Log Formula

The following formula is used to calculate the inverse log of a number and base.

x = logb-1(y) = b y

  • Where x is the value you are calculating
  • b is the base
  • and y is the number to take the log of

Inverse Log Definition

An inverse log is defined as the anti-log of a log function raised to a negative value.

Inverse Log Example

How to calculate the inverse log

  1. First, determine the base

    Logarithmic functions all require a base number. This is typically represented as b in the equation above. The natural log (ln) as a base of e = 2.718…

  2. Next, determine the value y

    Determine the number you wish to take the inverse log of.

  3. Calculate the inverse log

    Calculate the inverse log of y using the formula above.


What is an inverse log?

An inverse log is another way of saying the anti log. It’s a value representing the inverse of a logarithmic function and can be calculated using the equation x = b^y where b is the base.

What is a natural log?

The natural log is a logarithmic function with the base of e = 2.718.

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