When calculating the capacity of the table, it is necessary to calculate that for one person at the table there should be at least 60 cm in length and 40 cm in width. And if you want to seat your guests from the end of a rectangular table, then you need to add at least 10-20 cm more so that your guests feel as comfortable as possible.
The capacity of the table in a straight line depends on its shape. Tables with right corners of a square or rectangular shape are convenient in that they can be placed in the middle of the room or under the wall or in the corner of the room when you do not need its maximum capacity. However, if you have a large company at the table, then you can seat more people at an oval or round table, and everything is simple here, because guests cannot be seated at the corner of a rectangular table, while round and oval tables have no corners.