Deutsche Version |

The logarithm of a value of an arbitrary base can

be calculated, as well as all inverse calculations.

Formula: , that means also

The logarithm of the number *a* in base *b* is the exponent *x* such that *a* = *b*^{x}

log 2 |
= | lg, sometimes ld |

log e |
= | ln or log |

log 10 |
= | lg, sometimes log |

Shortened spelling:

log_{10} x |
= | lg x |

log_{e} x |
= | ln x |

log_{2} x |
= | lb x |

Please enter **two** values, the third will be calculated.

The natural logarithm *ln* is, when the base *b* = *e*. Euler's number *e* = 2.718281828459...

What is the logarithm of 4? Answer 0.60206 (exponent). Base b = 10. log 4 = 0.60206

What number the has exponent x = 0.81292? Answer 6.5 (number). Base b = 10. 10^{0.81292} = 6.5

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