# Log()

Calculates the natural logarithm of a number. Natural
logarithms are based on the constant e (2.71828182845904).

```
Log( number=number );
```

**Returns:** number

# Arguments

| Argument | Type | Required | Description | Default |
|----------|------|----------|-------------|---------|
| number | number | Yes | Positive real number for which to calculate the natural logarithm |  |

# Examples

The following code example will output an example number returned from the log() function.

```cfml
<cfoutput>#log(10)#</cfoutput>
```







# Categories

[Numbers](../../categories/number.md), [Math](../../categories/math.md)

# See Also

[Exp()](exp.md), [numeric.log()](../objects/numeric/log.md)