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The results also showed that fingernails now grow by 3.47mm every month â almost twice as fast as toenails. The nails of younger people and men grow faster. The little finger nail grows much more slowly than other fingernails, at a rate of 3.08mm each month. The middle finger has the fastest-growing nail.
Once the cycle is complete, it restarts and a new strand of hair begins to form. The rate or speed of hair growth is about 1.25 centimetres or 0.5 inches per month. Nails grow at an average rate of 3 mm(0.12 in) a month. Fingernails require three to six months to regrow completely, and toenails require 12 to 18 months.