Logarithm Calculator
Logarithm in any base, including log and ln.
What is a logarithm calculator?
A logarithm calculator finds the log of a number in any base. It answers the question: to what power must the base be raised to get this number?
How to use the logarithm calculator
Enter the value and the base, then click Calculate. Use base 10 for the common log, or type e for the natural log (ln).
Logarithm formula
log base b of x = y means b raised to the power y equals x. The common log uses base 10, and the natural log (ln) uses base e.
Example
log₁₀(100) = 2, because 10² = 100. And ln(1) = 0, because e⁰ = 1.
Frequently Asked Questions
What is log₁₀(100)?
log₁₀(100) = 2. Try it on the calculator above.
What is the natural log of 1?
The natural log of 1 is 0. Try it on the calculator above by entering value 1 and base e.
What is the difference between log and ln?
Log is the common log with base 10, while ln is the natural log with base e. Enter 10 for log or e for ln in the calculator above.
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