support.microsoft.com › en-us › officeExcel specifications and limits - Microsoft Support Worksheet arrays. Limited by available memory. Selected ranges. 2,048. Arguments in a function. 255. Nested levels of functions. 64. User defined function categories. 255. Number of available worksheet functions. 341. Size of the operand stack. 1,024. Cross-worksheet dependency. 64,000 worksheets that can refer to other sheets. Cross-worksheet ...