㏒ Logarithm Calculator
Log base 2, 10, e and any custom base
About this calculator
Logarithms answer the question "to what power must I raise this base to get this number?" Enter the value and the base — common log base 10, natural log base e, or any custom base — and the calculator returns the logarithm using the change-of-base formula. It also shows the related exponential form, so you can see the inverse relationship between logs and powers clearly.
Tip: log(1) is always 0 and the log of the base itself is always 1 — quick checks that your answer is in the right ballpark.