The principle is to know the equivalences of distance between each of the fingers:
2.5 cm is equal to the length of the first joint of the index finger.
5 cm is the equivalent of the length of the thumb.
10 cm is equivalent to the width measured on the knuckles of the hand, with the exception of the thumb.
15 cm corresponds to the distance between the tip of your thumb and the tip of your index finger when you spread your hand.
23 cm is equivalent to the distance between the tip of your thumb and the tip of the little finger when the hand forms a fist but these two fingers are spread apart at the ends.
46 cm corresponds to the distance between the elbow and the tip of the middle finger.
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