Hair Growth Calculator
Calculate how long until you reach your target length or how much your hair will grow in a given time.
Average hair growth: 1.25 cm/month. Fill any field.
Growth time (mos)
Growth length (cm)
Current and final length
Current length (cm)
Final length (cm)
Results are based on statistical averages. Trims, chemical treatments and health conditions may affect growth rate.
How Many Centimetres Does Hair Grow per Month on Average?
Human hair grows on average between 1 and 1.5 cm per month — about 12–15 cm per year. The calculator uses 1.25 cm/month as its baseline, the midpoint of this range. Growth rate varies by age, genetics, nutrition and hair care habits.
Factors That Affect Hair Growth
- Genetics — the most decisive factor; determines growth rate and anagen phase length.
- Nutrition — protein, iron, zinc and biotin deficiency slows growth.
- Hormonal changes — pregnancy, thyroid disorders and menopause affect the hair cycle.
- Hair care — regular moisturising and avoiding heat damage reduce breakage.
- Season — growth may slightly accelerate in summer months.
Tips to Help Hair Grow Faster
While exceeding your genetic ceiling is not possible, the right habits can maximise your growth potential. A protein- and iron-rich diet, regular scalp massage (to boost circulation), reducing heat styling, and using a conditioner are among the most effective practices. Stress management and adequate sleep also positively influence the hair cycle.