Logarithm calculator
Calculate a logarithm in any positive base, including e and 2.
Enter your values, then choose Calculate.
Limits
- The argument and base must be positive, and base cannot be 1. Approximate real-number outputs use 12 significant digits unless a unit specifies otherwise.
- Desktop limits are provisional. Physical mobile and Safari verification remains open.
What happens to your data
Logarithm calculator runs inside this browser tab, and the page's code comes from this site. There is no application server to receive your data, and the site's security policy limits connections to this site.
Good to know
- The argument and base must be positive, and base cannot be 1. Approximate real-number outputs use 12 significant digits unless a unit specifies otherwise.
- Desktop limits are provisional. Physical mobile and Safari verification remains open.