The size difference can be put in the following manner as well.
													
																	Difference between rug an dcarpet. 
									
	
		
	
																	What we call carpet is a floor covering that stretches from wall to wall and is affixed to the floor. 
																	This is the reason you cannot flatly say that a rug is just another word for a carpet and you cannot use these words as a synonym to each other. 
																	The word rug has come to mean a smaller item as in an area rug that is around 4 feet by 6 feet or less while the word carpet reflects bigger items as in an area carpet that are over 4 feet wide and 6 feet long. 
																	A rug is smaller than a carpet. 
															
													
									
	
		
	
																	A rug vs carpet rug and carpet are terms that are used interchangeably. 
																	Rugs on the other hand tend to be smaller than the square footage of the room by a lot or a little and are not affixed to the floor. 
																	Colloquially at least in the south the difference between a rug and a carpet seems to be movability. 
																	In other words a rug is less than 2m 6 5 feet in length. 
															
													
									
	
		
	
																	In america a carpet is a floor covering that is laid wall to wall and rugs cover only a small area or they are area specific. 
																	People call a wall to wall covering as a carpet and prefer to call smaller pieces that are either kept in the center of a room or below a bed as rugs. 
																	Although rugs do the same a rug is entirely not the same item as carpet.