There is no physical minimum door size - custom doors can be made to any size. There might be building codes for your area specifying what the minimum door size is for a commercial or residential structure, though...
28 inch is all you can get in that. Any door needs a minimum of 1 1/2 more than the door size.
A stall door should be a minimum of 4 feet wide by 4 feet tall and a door frame or jam height of 7 to 8 feet tall at the minimum, bigger is better if you can afford it.
The smallest door I have seen on house building plans is 2'0". The smallest door I have framed for and installed is a 2'4" door. That is the smallest size door I recommend anyone put in. For the handicapped or wheelchair bound the minimum size required is 3'0". sawkerfs
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Probably a little more than the width of the bath so that it can get in and out if it needs replacing. Baths are usually wider than they are tall so you could turn a bath on its side and fit it through even the narrowest of doors. Smallest door for a bathroom is probably 2ft (610mm) imperial door size or 626mm metric door size.
Supported minimum size
Minimum size is 36
The minimum size of an Excel workbook is 1 spreadsheet.
Normal door height is 80", although a door rough opening is 82 1/2" tall. Minimum hegth is 6 6".
24 inches from the door
The minimum size of a standard South African bedroom is 4000x2500
I think 18" is the smallest production interior door you can buy.