# Documentation/Calc Functions/PI

Other languages:

PI

Mathematical

## Summary:

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

PI()

## Returns:

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

## Arguments:

None.

• 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 cm2 of a circle of radius 4 cm. The area of a circle is given by $\displaystyle{ \pi\times (radius)^{2} }$. 50.2654824574367

PI