# Documentation/Calc Functions/PI

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## Function name:

PI

## Category:

Mathematical

## Summary:

Returns the approximate value of the mathematical constant π to 14 decimal places.

## Syntax:

PI()

## Returns:

The real number 3.14159265358979, which is the approximate value of π to 14 decimal places.

## Arguments:

None.

## Additional details:

- π can be defined as the ratio of a circle's circumference to its diameter.
- A common use of π is in converting angles between radians and degrees.
- Multiply the radians by 180/π (approximately 57.295779513) to convert to degrees.
- Multiply the degrees by π/180 (approximately 0.01745329252) to convert to radians.

- For more background information about π, visit Wikipedia's Pi page.

## Examples:

Formula | Description | Returns |
---|---|---|

=PI() | Here the function returns the value of π to 14 decimal places. | 3.14159265358979 |

=4*4*PI() | Here the formula calculates the area in cm^{2} of a circle of radius 4 cm. The area of a circle is given by [math]\displaystyle{ \pi\times (radius)^{2} }[/math]. |
50.2654824574367 |

## Related LibreOffice functions:

## ODF standard:

## Related (or similar) Excel functions:

PI