Using Variables in Formulas

After you add a variable, you can use it in formulas for various system objects (columns, tables, views, etc.). It is important to remember that all variable values are treated by the system as a simple text. Therefore you cannot simply input variables into formulas that deal with numbers or dates.

When creating formulas with a variable, you will need to convert the variable into a corresponding format. Variables are inserted into formulas in square brackets (for example, [hourly rate]). To covert a variable into the necessary format, use the Type Conversion functions ToXXX([variable]), for example:

When you create a formula, there may occur a situation when a variable and a column have the same name. References to column values and variables are given in formulas in the same way – in square brackets (for example, [project start date]). If the names of the column and the variable coincide, the formula will use the column value.

The following table contains examples of converting variables into a different format and using variables in formulas:

Variable Name


Format to Convert to

Conversion Function

Formula Example,


hourly rate



ToNumber( [hourly rate])

ToNumber( [hourly rate]*8

The formula calculates the amount earned per 8 hours of a normal workday.

start date



ToDate( [start date])

Today () - ToDate( [start date])

The formula calculates how many days have passed from the project start date.

Next: Working with Formulas