Most people who feel their hair “won’t grow” are actually losing length about as fast as they gain it. This guide explains how hair growth works, what realistic numbers look like for textured hair, and where length really goes — so you can spend your effort on what moves the needle.
How hair grows
Each hair grows from a follicle in a repeating cycle. In the growth phase, which lasts several years, the follicle keeps producing hair. A short transition phase follows, then a resting phase, after which the hair sheds and a new one starts growing in its place. Because every follicle runs on its own schedule, you lose some hairs every day. The American Academy of Dermatology describes shedding about 50 to 100 hairs a day as normal.
How long your growth phase lasts sets your personal maximum length. Two people who grow hair at the same speed can still end up with different maximum lengths because their follicles grow for different numbers of years.
How fast does textured hair grow?
Half an inch a month is the figure you’ll see everywhere. Research that measures growth directly has found wide variation between individuals and between groups; one study of African hair recorded an average of about 256 micrometers a day, which works out to roughly 0.3 inches a month. Your rate may be faster or slower — the only way to know is to measure it.
Pick one section, stretch it, and measure from scalp to ends on the same day each month for two or three months. If you relax your hair, measure the new growth just before a touch-up and divide by the number of months since your last one.
Growth vs. retention
Growth happens at the scalp; length is what’s left at the ends. Tightly coiled hair bends and twists along the strand, which makes it more likely to knot and break during combing and styling. Every time ends snap off, you lose some of the growth you made at the roots.
That’s why length retention matters so much. If your hair grows half an inch a month but you lose a quarter inch to breakage, your net gain is half what you expected. The hair growth calculator lets you change your retention and trim schedule to see how much sooner you’d reach your goal by keeping more of what grows.
What actually helps you keep length
- Detangle gently and with plenty of slip. Use conditioner, work in sections and start at the ends.
- Protect your ends. Styles that tuck the ends away help — as long as they aren’t pulling on your scalp.
- Limit high heat and chemical overlap. Both weaken the strand.
- Keep hair moisturized. Dry, brittle hair breaks more easily.
- Cover your hair at night with satin or silk to reduce friction.
- Look for single-strand knots and snip them carefully rather than ripping through them.
Do trims help hair grow?
Trimming doesn’t change how fast your hair grows, because growth happens in the follicle, not at the tips. What trims can do is remove split ends before they travel further up the strand and cause more breakage. The goal is to trim only as much and as often as your ends actually need — the growth calculator shows how a trim schedule changes your yearly gain.
Does diet matter?
Hair follicles need nutrients like any other tissue, and research reviews have linked certain deficiencies, such as low iron, with increased shedding. But supplements haven’t been shown to speed growth in people who aren’t deficient, and high-dose biotin can interfere with some laboratory tests. If you’re worried about your diet or notice extra shedding, ask your doctor about testing before you start taking anything.
Know your length levels
Length goals are usually described by where hair falls on the body: shoulder length (SL), armpit length (APL), bra-strap length (BSL), waist length (WL) and so on. Because torsos differ, the same number of inches lands in a different place on different people. The interactive hair length chart scales each level to your height so your goal is realistic for your body.
When to see a dermatologist
See a board-certified dermatologist if you notice bald patches, a widening part, thinning at the edges or temples, sudden heavy shedding, or scalp pain, itching or scaling. These can have medical causes that need a proper diagnosis, and earlier care usually means more options.