A worksheet is a bounded grid, not an endless list
In Excel, the final row is numbered 1,048,576, and there is no row 1,048,577 to scroll into. The limit is exactly 2²⁰: a grid that can be indexed with 20 binary digits, where each digit has only two possible values. That neat power-of-two boundary fits the way computers represent addresses, although the number alone does not establish why the limit was chosen.
The key distinction is between a worksheet and a data store. A worksheet gives people a visible, addressable grid—cells such as A1 or XFD1048576. That grid has fixed edges. A database, by contrast, is designed to hold records without presenting them as one enormous sheet, so it can be a better place to keep data that grows beyond a worksheet’s bounds.
What happens when data reaches the edge
If an import or paste contains more rows than a sheet allows, the overflow cannot become additional worksheet rows. The data needs to be split across sheets or files, filtered before import, or handled in a tool built for larger datasets. Splitting may preserve the records, but it can make sorting, formulas, and analysis across the whole collection harder.
The limit is therefore more than an arbitrary stopping point on the screen: it marks the size of the grid that spreadsheet operations can address. A file with millions of records may still be usable, but once the records outgrow the sheet, treating them as a table in a database or data-analysis system can avoid forcing an unbounded collection into a bounded grid.
