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Instant calculation
Enter the data and press the button to get the result.
Online Calculator
Logarithms Calculator
Enter a positive number and a valid base to calculate its logarithm.
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Local processing
The calculation is done directly in your browser.
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Free
No registration, external API or subscription required.
Frequently asked questions
What bases can I use?
Any positive base other than 1.
What is natural logarithm?
It's the logarithm in base e.
What is decimal logarithm?
It is the base-10 logarithm.
Can I calculate the logarithm of zero?
No. The real-valued logarithm of zero is undefined.