# LOG

## Content

This function returns the logarithm base Y of a number X.

## Syntax

`LOG(number, base)`

## Arguments

This function has these arguments:

| Argument | Description |
| -------- | ----------- |
| *number* | Number for which to find a logarithm. This must be a positive real number |
| *base* | [Optional] Base of the logarithm; if omitted, the calculation uses 10 as the base (See [LOG10](/spreadjs/docs/v16/formulareference/FormulaFunctions/math-trig-functions/LOG).) |

## Data Types

Accepts numeric data for both arguments. Returns numeric data.

## Examples

`LOG(B3,C5)`

`LOG(R1C2,R4C4)`

`LOG(255,16)` gives the result 1.9985883592