Door come with different sizes. Considering that the question is about an average door used in modern house.
Therefore, average dimensions are: 7 feet x 2 feet.
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The width of a door is the distance between the side jambs. The detail of door measurement is shown at the web link below.
You find a tape measure and take the measurement across the door, then the length of it, then if necessary the thickness.
meters
You can not measure my weight! Who did measure the size of earth?
the smallest measurement in the us