Nail Growth Calculator
Fingernail Growth
Calculate time for fingernails to grow to desired length
mm
mm
Toenail Growth
Calculate time for toenails to grow or replace fully
mm
Formula
Time (days) = Growth Needed (mm) / Daily Rate | Fingernails ≈ 3.47 mm/month | Toenails ≈ 1.62 mm/month
Frequently Asked Questions
How fast do fingernails grow?
Fingernails grow about 3.47 mm per month (0.12 mm/day) on average. The middle finger grows fastest, and nails on the dominant hand grow slightly faster. Growth rate decreases with age.
How fast do toenails grow?
Toenails grow about 1.62 mm per month, roughly half the rate of fingernails. A lost toenail takes 12-18 months to fully regrow, compared to 4-6 months for a fingernail.
What affects nail growth speed?
Factors include age (slows with age), nutrition (biotin, protein), season (faster in summer), hand dominance (dominant hand is faster), health conditions, and hormones (pregnancy increases growth).
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