4cm
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The width of an index finger depends on the size of the person. For instance, an average size person will have an index finger that is roughly one half inch wide.
There is no scientific name for the width of the index finger. The name index finger literally means pointing finger.
You can either press the 'tab' key once if using a computer, or the width of your index finger when writing.
3 in.x5 in.
about 3/4 of an inch or 2 cm