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My fingernail grows about an inch per year. One study indicates an average lifetime fingernail growth rate of about 5 mm/week.

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Fingernail growth rate varies considerably, and fairly predictably, with age.

The rate increases to a high of 0.9 mm/week sometime in the 30,s, and then decreases at the rate of about 5% per year for a total of about 50% over the human life span.

Other factors affecting growth rate include skin temperature, gender, day/night biorhythms, circadian and other long term biorhythms.

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Aurelia Rohan

Lvl 10
2y ago

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