pi
Learn how to use the mathematical constant pi in Notion formulas.
The mathematical constant pi (
ππ
) equals (roughly) 3.1415926559.
1
pi
ππ
is the ratio between the circumference and diameter of a circle. This ratio is shared by all circles, no matter the size.
ππ
can be used to calculate the circumference and area of a circle, volume and surface area of a sphere, and more.
You can learn more about
ππ
here:
Prehistoric Calculus: Discovering Pi – BetterExplained

1
pi * 10
The above formula will calculate the circumference of a circle with a diameter of 10cm. It uses the simple equation
πdπd
, where
dd
is the diameter of the circle.
In this case, the circumference would be approximately
31.4159265cm31.4159265cm
.

In this example database, the Formula (num) property calculates the area of a circle with a given radius, set in the Circle Radius (cm) property.

pi
College Info Geek on Notion

1
pi * prop("Circle Radius (cm)") ^ 2
The formula to calculate the area inside a circle is
πr2πr^2
. We can create this equation in a Notion formula using the code above:
  • pi is the Notion constant for
    ππ
  • prop("Circle Radius (cm)") uses the prop() function to pull in the value of the Circle Radius (cm) Number property
  • ^ 2 squares the radius of the circle
Other formula components used in this example:

1
format(round(prop("Formula (num)") * 100) / 100) + "cm²"
This formula:
  1. 1.
    Intakes the output of the previous formula
  2. 2.
    Rounds it to the nearest hundredth (i.e. two decimal places)
  3. 3.
    Converts the resulting number to a String
  4. 4.
    Appends “cm²”
Note that Notion formulas do not support text formatting, so I’m using the actual ² symbol. You can find this symbol here:
⬛❒▣²³ Square symbol, text box symbol (copy and paste)
To round the decimal to two decimal places, I use the following trick:
1
round(prop("Formula (num)")*100)/100
Notion’s built-in round() function only rounds numbers to the nearest whole integer. But this trick will output a rounded number to two decimals places instead. Learn more about this trick in the round function reference.
Other formula components used in this example:

My name is Thomas Frank, and I'm a Notion-certified writer, YouTuber, and template creator. I've been using Notion since 2018 to organize my personal life and to run my business and YouTube channel. In addition to this formula reference, I've created a free Notion course for beginners and several productivity-focused Notion templates. If you'd like to connect, follow me on Twitter.
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