Logarithm Calculator
Calculate the logarithm of a number in any base.
Result
Results are estimates for general information only and are not professional advice.
Logarithms
A logarithm answers the question: to what power must the base be raised to produce this number? This calculator computes log in any base, along with the natural log (ln) and log base 10.
Frequently Asked Questions
What is the Logarithm Calculator?
Calculate the logarithm of a number in any base. It runs instantly in your browser and is completely free to use.
What do I need to enter to use the Logarithm Calculator?
The Logarithm Calculator asks for the following values (2): Number, Base. Fill them in and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the Logarithm Calculator?
The Logarithm Calculator uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the Logarithm Calculator free, and do I need an account?
Yes. The Logarithm Calculator — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.