# PI Function (DAX)

SQL Server 2008 R2

Returns the value of Pi, 3.14159265358979, accurate to 15 digits.

```
PI()
```

## Return Value

A decimal number with the value of Pi, 3.14159265358979, accurate to 15 digits.

## Remarks

Pi is a mathematical constant. In PowerPivot, Pi is represented as a real number accurate to 15 digits, the same as Excel.

## Example

The following formula calculates the area of a circle given the radius in the column, [Radius].

```=PI()*([Radius]*2)
```