The ideal width of your kitchen island largely hinges on your kitchen's overall layout and space. Typically, you can expect it to be around 1 metre (3 feet) in width, albeit this value can fluctuate.
The vital thing is to ensure ample space for unencumbered movement surrounding the island. If your kitchen offers more generous space, a wider island could be more suitable, provided a 1-metre walkway is maintained around the island's entire perimeter.