# PI

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

## Syntax

```
PI()
```

## Return value

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

## Remarks

Pi is a mathematical constant. In DAX, 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)
```