What font size?
The answer will depend on the font SIZE, not the font itself!
A one-inch margin is equivalent to four spaces. This is the standard measurement used in most word processing programs and typesetting conventions.
Approximately five spaces. However, the number of spaces depend upon the font setting your use. My advise to you is to use whatever suits you, thought be realistic...
The answer depends on the graduation.
6
8
2.54 cm is equal to 1 inch
2.54 cm equal 1 inch
87.5 of them
1 inch = 0.0000254 kilometers
One inch is equal to 25400 micrometres.
Half inch is equal to 12.7mm