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how much does the nail grow in a day ?

0.1mm is an approximated answer.

More Information:

Fingernails grow about three to four times faster than toenails. The nails on your dominant hand grow faster than those on your other hand, and nails grow faster on your longest fingers as well. Fingernails also grow more quickly in the summer than in the winter -- scientists aren't sure why, but one theory is that nails that are used more often and exposed to the elements grow faster.

So how fast do the average adult's nails grow? The simple answer is that fingernails grow about one-tenth of an inch (3 millimeters) a month. If you lose a fingernail, it will take four to six months to regrow completely. Toenails take a year to a year and a half to grow from cuticle to tip.

If you notice a change in your nails or their growth rate, see your doctor.