Syntax
PI()
| Parameter | Description |
|---|
Examples
Circle area
Formula
=PI()*5^2
Returns ~78.54. The area of a circle with radius 5 is pi × r² ≈ 78.54 square units.
Circumference
Formula
=2*PI()*10
Returns ~62.83. The circumference of a circle with radius 10 is 2πr ≈ 62.83 units.
Convert degrees to radians
Formula
=45*PI()/180
Returns ~0.7854 (π/4 radians). Multiply degrees by PI()/180 to convert to radians for trig functions.
Common Errors
#N/A
PI takes no arguments. =PI(1) will error because the function expects an empty argument list.
Tips
No arguments needed
PI() takes no arguments — always include the empty parentheses. Writing just PI without () won't work.
Full precision
PI() returns 15 digits of precision (3.14159265358979). This is more than sufficient for any practical calculation.
Use RADIANS() instead
Instead of =angle*PI()/180, use =RADIANS(angle) for cleaner formulas. Similarly, =DEGREES(radians) is cleaner than =radians*180/PI().
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