# Log Function

Returns the natural logarithm of a number.

```
Log(number)
```

## Remarks

The number argument can be any valid numeric expression greater than 0.

The natural logarithm is the logarithm to the base *e*. The constant *e* is approximately 2.718282.

You can calculate base-*n* logarithms for any number *x* by dividing the natural logarithm of *x* by the natural logarithm of *n* as follows:

```
Logn(x) = Log(x) / Log(n)
```

The following example illustrates a custom Function that calculates base-10 logarithms:

```
Function Log10(X)
Log10 = Log(X) / Log(10)
End Function
```