Logarithm Calculator
Math CalculatorsCalculate the log of a number with any base.
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About This Tool
Free online Logarithm Calculator. Find the log of x to base b. Supports common log (base 10) and custom bases.
Frequently Asked Questions
A logarithm is the inverse function to exponentiation. It tells you what power you must raise a base to in order to get a certain number.
A common logarithm is a log with a base of 10. It is often written as just "log(x)".
If the base is 1, raising it to any power will always result in 1, so it cannot be used to find logs for other numbers.
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