How Fast Does Hair Grow?
On average, hair grows about 0.5 inches (1.25 cm) per month — roughly 6 inches per year. But the actual rate varies meaningfully:
| Hair type / factor | Monthly growth |
|---|---|
| Asian hair | 0.5 - 0.6 in |
| Caucasian hair | ~0.5 in |
| African-textured hair | 0.3 - 0.4 in (shrinkage makes it appear slower) |
| Age 15-30 (peak) | Fastest years |
| After 50 | ~20% slower |
Hair Growth Chart: How Many Inches by Month
This is the chart most people are looking for: cumulative length over time, at three real-world rates. Find your rate, then read across to the months you care about.
How much will my hair grow in…? (table)
| Time | Slow (0.3 in/mo) | Average (0.5 in/mo) | Fast (0.6 in/mo) |
|---|---|---|---|
| 1 week | 0.07 in | 0.12 in (3 mm) | 0.14 in |
| 2 weeks | 0.15 in | 0.25 in (6 mm) | 0.3 in |
| 1 month | 0.3 in | 0.5 in (1.25 cm) | 0.6 in |
| 2 months | 0.6 in | 1 in | 1.2 in |
| 3 months | 0.9 in | 1.5 in (3.8 cm) | 1.8 in |
| 4 months | 1.2 in | 2 in (5 cm) | 2.4 in |
| 6 months | 1.8 in | 3 in (7.5 cm) | 3.6 in |
| 9 months | 2.7 in | 4.5 in | 5.4 in |
| 12 months | 3.6 in | 6 in (15 cm) | 7.2 in |
| 24 months | 7.2 in | 12 in (30 cm) | 14.4 in |
These are average-case numbers, and they assume nothing is cut or breaks off. Real timelines are usually longer — the calculator below subtracts your trim schedule, which is why it can show 13 months where the table above says 12.
The Science: Hair Growth Phases
Hair grows in three phases, and understanding them explains why some people can grow hair to their waist while others max out at shoulder length:
- Anagen (growth) — lasts 2-7 years. This phase's length determines your maximum hair length. A 2-year anagen phase caps out around 12 inches; a 7-year phase allows 42+ inches.
- Catagen (transition) — 2-3 weeks, growth stops
- Telogen (resting/shedding) — 2-4 months, then the hair falls out
About 85-90% of scalp hairs are in the anagen phase at any time — that's why you don't shed all at once.
Hair Length Reference Guide
| Length | Inches |
|---|---|
| Pixie | 2 in |
| Bob | 4 in |
| Chin length | 6 in |
| Shoulder | 8 in |
| Mid-back | 12 in |
| Waist | 16 in |
| Hip | 20 in |
| Tailbone | 24 in |
The Truth About Trims
Trimming does not make hair grow faster — hair grows from the root, not the ends. However, regular trims (every 8-12 weeks) prevent split ends from traveling up the shaft and causing breakage, which destroys length you've already grown. The calculator factors in trim loss so your timeline is realistic — every trim adds a little time to your goal.
How to Actually Grow Hair Faster
You can't dramatically change your genetic rate, but you can improve retention — which is what makes hair *look* like it's growing faster:
- Reduce heat styling — heat damage causes breakage that eats your progress
- Protect hair while sleeping — silk pillowcase or loose braid prevents friction breakage
- Eat for your hair — protein, iron, and overall balanced diet matter (supplements only help if you're deficient). Check your daily target with our protein calculator.
- Keep your scalp healthy — clean, hydrated scalp supports the follicles
- Be patient — 0.5 in/month means consistent effort compounds over a year
This page is part of our everyday health tools — hydration, hair growth, and blood alcohol numbers in one place.
Frequently Asked Questions
How fast does hair grow per month?
About 0.5 inches (1.25 cm) per month on average, or 6 inches per year. Rates vary by genetics, age, health, and hair type.
How much will my hair grow in 2 weeks?
About 0.25 inches (roughly 6 mm) in two weeks at the average rate. Slow growers (0.3 in/month) see closer to 0.15 inches, fast growers (0.6 in/month) about 0.3 inches — see the growth chart.
How much will my hair grow in 1 month?
About 0.5 inches (1.25 cm) in one month on average. The normal range is 0.3–0.6 inches per month depending on hair type, age, and health.
How much will my hair grow in 6 months?
Roughly 3 inches (7.5 cm) in six months at the average rate — about 1.8 inches on the slow end and 3.6 inches on the fast end. Trims and breakage reduce what you actually keep.
How much does hair grow in a year?
About 6 inches (15 cm) per year at the average rate, which is why chin-length hair takes roughly a year to reach the shoulders.
How long does it take to grow hair 6 inches?
About 12 months at average rate. Trims and breakage stretch that timeline.
How long does it take to grow hair 12 inches?
About 24 months (2 years) at 0.5 in/month, assuming your anagen phase allows it.
Does trimming make hair grow faster?
No — but it prevents breakage, so you retain more of what you grow.
Can hair grow 2 inches in a month?
Highly unlikely. Normal is 0.5-0.7 in/month. Faster apparent growth = better retention.
How can I speed up hair growth?
Improve retention: less heat, silk pillowcase, balanced diet, healthy scalp. You can't change your genetic baseline.
Methodology & sources: Average growth rate 0.5 in/month per the American Academy of Dermatology; growth phases and anagen length limits per standard dermatology references; ethnic rate variations from published trichology data. Estimates only — not a medical tool.