> For the complete documentation index, see [llms.txt](https://docs.inforiver.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.inforiver.com/editable/formula-and-functions/math-functions/log.md).
# LOG
The LOG function returns the logarithm of a number to the base specified.
### Syntax
log(value, base)
### Arguments
value - The positive real number for which you want the logarithm. This is a required argument.
base - The base of the logarithm. This is a required argument.
### Example
```excel-formula
log(COLUMN1, 10)
```
Returns the Log to the base 10 of COLUMN1
### Excel equivalent
[LOG](https://support.microsoft.com/en-us/office/log-function-4e82f196-1ca9-4747-8fb0-6c4a3abb3280)
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://docs.inforiver.com/editable/formula-and-functions/math-functions/log.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.