the width of the seating portion is about 1++ foot across, so X 2 for 2 seats, X 4 if u want to wrap the rear seats
1 unit is 1 meter by 54 inches wide (4.5 Feet)
Since the length of the seating portion is slightly over a meter I would estimate:
-to cover 2 seats u would need 2 meters,
-so 4 meters can cover front and back seats
-to cover the door panels, add an extra meter (should be enuf for all 4 doors)