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Converting Data Types

Learn how to convert data to another type in a Notion formula.
Notion formulas can only return data of a single type. For reference, Notion formulas work with four distinct data types:
Additionally, you can only compare data that share the same type when you use comparison operators such as equal, and, or larger (and some require a specific data type).
Therefore, you'll often need to convert data from one type to another in order to get your formula to work.
Here are all the methods you can use to convert data to another type.

Converting Strings

To numbers:
Function/Method
Example
toNumber
toNumber("42")
unaryPlus (+)
+"42"
To Booleans:
Function/Method
Example
if
if(prop("Text") == "true", true, false)
Good to know: You can't truly convert strings, numbers, or dates to Boolean values. What you can do is write a simple statement that outputs a Boolean true/false value using your starting piece of data as criteria.

Converting Numbers

To strings:
Function/Method
Example
format
format(42)
To Booleans:
Function/Method
Example
if
if(prop("Num") == 42, true, false)
To dates:
Function/Method
Example
fromTimestamp(prop("Num"))
Note: fromTimestamp only works if its argument is a valid Unix timestamp.
Good to know: replace, replaceAll, and test are able to automatically convert numbers and Booleans (but not dates) to strings. Manual type conversion is not needed.

Converting Booleans

To strings:
Function/Method
Example
format
format(true)
To numbers:
Function/Method
Example
toNumber
toNumber(true)
unaryPlus (+)
+true

Converting Dates

To strings:
Function/Method
Example
format
format(now())
formatDate(now(), "MMM DD YYYY")
To numbers:
Function/Method
Example
timestamp
timestamp(now())
toNumber
toNumber(now())
minute
minute(now())
hour
hour(now())
day
day(now())
date
date(now())
month
month(now())
year
year(now())
Good to know: The toNumber function converts dates to their Unix timestamp, just like the timestamp function.
To Booleans:
Function/Method
Example
if
if(prop("Date") == now(), true, false)

About the Author

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.