Hair Growth Rates
Hair grows on average about 0.5 inches (1.25 cm) per month, or roughly 6 inches per year. Growth rate varies by genetics, age, nutrition, and hair type. Asian hair tends to grow fastest at about 6.3 inches/year, while African hair averages about 4 inches/year. A balanced diet rich in biotin, iron, and protein supports healthy growth. Regular trims prevent split ends from traveling up the shaft, protecting overall length retention.