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Two different questions wearing one name. Over a table the table decides; in open floor space the room decides. Tell us which, and we will give you a diameter and a drop height.
Optional
Enter the width of the table to get a size.
For a room, the old designer's rule is to add the width and the length in feet and read the answer in inches. A 12ft by 14ft room wants a fixture around 26in across. In metric that comes out as the width plus the length in metres, times ten, in centimetres — so a 3.5m by 4.5m room wants roughly 80cm.
Over a dining table the room is irrelevant. The table sets the size, and a pendant between a half and two-thirds of the table's width reads as belonging to it. A fixture sized to the room and hung over a table almost always looks too big.
Height over a table is 75 to 90cm from the tabletop to the bottom of the shade. Lower and it blocks the eye line between people sitting opposite each other; higher and it stops lighting the table, which was the point.
In open floor space the constraint is headroom, not proportion: leave at least 210cm clear beneath the shade. Under a tall ceiling, drop it further — roughly 7.5cm more for every foot of ceiling above the standard 8ft — otherwise the fixture reads as stranded near the ceiling.
Under a ceiling below about 240cm, a flush or semi-flush fitting will serve better than a pendant however carefully it is sized. There is no drop height that makes a hanging fixture comfortable in a low room.