Logarithm Calculator

Calculate logarithm of a number to any base:

* Use e for scientific notation. E.g: 5e3, 4e-8, 1.45e12

Then the base b logarithm of a number x:

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 inverse logarithm) is calculated by raising the base b to the logarithm y: