Guides/ReportDesign/4.0-fields-tab.md
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Functions allow you to perform calculations on the data and can be chosen from the dropdown menu based on the data type of the selected Field. Here is an [[article on SQL Functions|http://www.w3schools.com/sql/sql_functions.asp]]
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+*Note*: When calculating a field containing an expression, you must use a function aggregate if you want to use a calculated field in a chart. Click [here](http://wiki.izenda.us/FAQ/Calculated-Field-With-Expression-In-Chart) for more details.
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**Text (String) Functions Available**
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![](/Guides/ReportDesign/4.0-fields-tab/functions_dropdown_string.png)