When allocating space for a bar stool with arms, several factors come into play. Typically, a bar stool with arms requires more space than its armless counterpart, both in terms of width and turning clearance. On average, armrests can add an additional 3 to 4 inches to the width of a stool. In terms of spacing between stools, it's generally recommended to allow for 6 to 10 inches to prevent overcrowding and to ensure patrons can sit and move comfortably. Furthermore, considering the swivel and entry-exit movement, extra clearance space is necessary for stools with arms. If they're to be tucked under a counter or bar, the height and depth of the arms need to be factored in to ensure they fit without obstruction. As a rule of thumb, when planning the layout, consider both the dimensions of the stool and the intended user experience to achieve a comfortable and functional setup.