Half an inch a month sets the timeline
Scalp hair grows about 0.5 inches a month, or six inches a year. Subtract your current length from your goal and divide by the monthly rate to get the wait. The rate is close to fixed — that is why growing out a cut takes so much longer than people expect.
Time to reach a target length
| From → to | Inches to grow | At 0.5"/mo |
|---|---|---|
| Buzz → chin (6") | 6" | 1 year |
| Buzz → shoulder (16") | 16" | ~2.7 years |
| Buzz → mid-back (24") | 24" | 4 years |
| Pixie (3") → shoulder (16") | 13" | ~2.2 years |
| Shoulder (16") → waist (30") | 14" | ~2.3 years |
Rates vary: at a slow 0.25"/mo these times double; at a fast 0.75"/mo they drop by a third.
What actually moves the number
- Genetics is most of it. Your growth phase length — and so your maximum length — is roughly 80 to 90% inherited. Some people cannot pass 18–20 inches no matter what.
- Breakage subtracts. If hair grows 0.5" but splits and snaps 0.3" at the ends, net gain is only 0.2". Regular trims and less heat protect length you already have.
- Trimming does not slow growth. It removes damaged ends so the length that survives is even — hair grows from the root, not the tip.
Common questions
How fast does hair grow?
About half an inch a month, which is roughly six inches a year. The normal range runs from about 0.3 to 0.7 inches a month depending on age, health and genetics.
How long does it take to grow hair to shoulder length?
Shoulder length is about 16 to 18 inches from the crown. From a buzz cut at half an inch a month that is roughly 32 to 36 months, or a little under three years.
Can I make my hair grow faster than half an inch a month?
Only slightly. The biological ceiling is around 0.75 inches a month under ideal conditions. Good nutrition and less breakage help, but no shampoo or supplement pushes hair past its genetic rate.
