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

When:

b^{ y} = x

Then the base b logarithm of a number x:

log_{b }x = y

Logarithm change of base calculator

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:

When

y = log_{b }x

The anti logarithm (or inverse logarithm) is calculated by raising the base b to the logarithm y: