The current Pontiac Grand Prix is 4,964 mm long, 1,825 mm wide and 1,391 mm tall, on a 2,730 mm wheelbase.
Only one generation of this model is in our catalogue, so there is no size history to compare yet.
Exterior figures are manufacturer specifications for the Grand Prix, averaged per generation across its variants and shown for the most common body style. Generations with the same size are merged. Boot capacity is the seats-up figure where the manufacturer quotes one.