Any number you like. You can have a tiny circle with a tiny diameter or a huge big circle with a big diameter. The diameter is simply the "width" of the circle. It is the length of the line from one side to the other which passes through the centre.
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The area of a 3-inch diameter circle is about 7.068 square inches.
A circle with an 8-inch diameter has a perimeter of 25.1 inches.
19.63 square inches are in the area of a 5-inch diameter circle.
The circumference of a circle with a diameter of 45 inches is 141.37 inches.
A circle with a 23 inch diameter has am area of 415.4756 sq inches (to 4 dp).