Having said that, if you have not split the database then you should
when you have completed the design. You could then monitor the
back-end size (if you need to), the front-end size should not really
change that much.
The FileLen function returns the size of the file on disk which may
not be the size of the same file in memory. Obviously an Access file
usually writes data back to disk during use so the file size will
almost certainly be different the next to you try it.
If you need the size of an open file you could perhaps use the LOF
function, check Help for details.