Logarithm Calculator — Log, Ln, Log Base N
The Logarithm Calculator computes logarithms in any base — common log (base 10), natural log (base e), binary log (base 2), or any custom base you specify. Logarithms are the inverse of exponentiation and are used in science, engineering, acoustics (decibels), pH chemistry, information theory, and finance.
How to Use This Calculator
- 1
Enter the number you want to find the logarithm of.
- 2
Select the log base (base 10, natural log e, or base 2).
- 3
Click Calculate to see the logarithm value.
Frequently Asked Questions
A logarithm answers: 'To what power must the base be raised to get this number?' log₁₀(100) = 2 because 10² = 100. Logarithm is the inverse of exponentiation.