Hi Paul,
Thank you for your interest in Syncfusion Products.
You can use the documentation to find the list of all functions supported for formula cell.
Please refer the below link for Online documentation:
http://www2.syncfusion.com/ug_61/gridwin/default.html1.Click the Grid.win link from the page
2. Browse through the category:
Grid Control-->Basic concepts--->Formula Support--->Function Reference section
Kindly let us know if you need any further assistance.
Best Regards,
Jeba.