Growth rate1.2 billionths m/s
14 trillionthsBullet trains
74.4 trillionthsCharging grizzly bears
About 0.1 mm per day
Photo from Wikimedia Commons
Fingernail Growth (Per Day)
The slowest show on your body/Medicine & Biology
Human fingernails grow at an average rate of about 3.47 mm per month, or roughly 0.1 mm per day. That is about 1 nanometer per second. Your middle finger nail grows fastest, and your thumbnail grows slowest. Fingernails grow about twice as fast as toenails. It takes about 6 months to grow an entirely new fingernail.
Measurements
Daily growth100 millionths m
426 trillionthsJamaica lengths
1 thousandthsChicken wing lengths
0.1 mm per day
Nail thickness500 millionths m
208 millionthsCorn stalk heights
68.3 millionthsSoccer goal widths
27.3 millionthsRailroad car lengths
About 0.5 mm
Full regrowth time15.6 million s
4,927Microcenturies
7 thousandthsQueen Elizabeth II reigns
15.6 millionMississippis
About 6 months
Nail width (middle finger)1.4 hundredths m
42 millionthsAircraft carrier lengths
4 hundredthsSpider web diameters
About 14 mm