
| Deutsche Version |  |  | 
The logarithm of a value of an arbitrary base can
be calculated, as well as all inverse calculations.
 
Formula:  , that means also
, that means also 
 
The logarithm of the number a in base b is the exponent x such that a = bx
| log 2 | = | lg, sometimes ld | 
| log e | = | ln or log | 
| log 10 | = | lg, sometimes log | 
Shortened spelling:
| log10 x | = | lg x | 
| loge x | = | ln x | 
| log2 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. 100.81292 = 6.5
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