How Fast Does Hair Grow? What to Realistically Expect

Whether you’re growing out a bad haircut or waiting for hair to come back after a period of shedding, the same question comes up: how fast does hair grow, and how long until you see a difference? The honest answer is slower than most people hope, and understanding the real timeline saves a lot of frustration.

Here’s what to expect, what affects the rate, and why patience is genuinely part of the process.

How Fast Does Hair Grow on Average?

Scalp hair grows at roughly 1 to 1.5 centimetres a month, which works out at around half an inch. Over a year that’s somewhere between 12 and 15 centimetres, or about six inches, assuming the hair stays healthy and doesn’t break along the way.

That average hides a fair amount of variation. Some people grow noticeably faster, others slower, and the same person’s rate changes over their lifetime. But as a working number, a centimetre a month is the figure to plan around.

How Much Does Hair Grow in a Month?

About a centimetre. It’s worth sitting with how small that is, because it explains why hair goals take so long. Growing shoulder-length hair to mid-back is roughly a year. Recovering visible thickness after significant shedding is typically six months or more, because the new hairs have to grow long enough to blend with the rest.

This is also why no product can deliver dramatic results in weeks. Anything promising visible regrowth in that timeframe is working against basic biology.

What Affects How Fast Hair Grows?

Genetics

Your baseline growth rate is largely inherited, along with how long each hair stays in its growing phase before shedding. That length of growth phase determines your maximum hair length, which is why some people can grow hair to their waist and others plateau at shoulder length no matter how patient they are.

Age

Growth tends to slow with age, and the growth phase shortens. This is part of why hair often feels thinner and shorter as people get older, even without noticeable loss.

Nutrition

Hair is made largely of protein, and growing it requires a steady supply of nutrients. Deficiencies, particularly iron, can slow growth or push hairs into shedding early. Our guide on vitamin deficiencies and hair loss covers what to look for.

Scalp health

Hair grows from follicles in the scalp, so scalp condition directly affects growth. A congested, inflamed or neglected scalp is a poorer environment than a healthy one. This is the principle behind traditional Chinese herbal hair care, which treats the scalp as the foundation rather than focusing only on the strand.

Stress and illness

Significant stress or illness can push large numbers of hairs into the resting phase, causing shedding a couple of months later. Our guide on telogen effluvium explains this pattern and how long recovery takes.

Does Hair Grow Faster in Summer?

There’s some evidence that hair grows marginally faster in warmer months, likely linked to increased circulation and seasonal changes in the growth cycle. The difference is small enough that you’re unlikely to notice it day to day, and it’s not something to plan around.

The flip side is more noticeable: many people shed more in autumn, as a larger proportion of hairs enter the resting phase during summer and fall out a few months later. That seasonal shedding is normal and usually settles on its own.

Can You Make Hair Grow Faster?

Not dramatically, and it’s worth being clear about that. You can’t override your genetic growth rate. What you can do is remove the things holding it back and make sure your hair reaches its potential rather than breaking along the way.

That means addressing nutritional gaps, looking after your scalp, avoiding excessive heat and tight styling that cause breakage, and being gentle with wet hair. Supporting the scalp with a consistent routine gives the follicles the best conditions to work in. Our Hair Growth Tonic is formulated with Chinese herbal ingredients to feed the follicles as part of that approach.

What doesn’t work is expecting speed. The most common mistake is abandoning a routine after six weeks because nothing visible has happened, when a centimetre of growth was all that was ever going to happen in that time.

How Long Until I See Results?

For any hair care routine, give it three months minimum before judging, and six months for a fair assessment. If you’re recovering from shedding, expect the shedding to settle first, then several more months before thickness visibly returns.

Understanding the hair growth cycle makes this easier to accept, because you can see why the timeline works the way it does.

Frequently Asked Questions

How fast does hair grow in a week?

Around 2 to 3 millimetres, which is why weekly changes are essentially invisible.

Does cutting hair make it grow faster?

No. Growth happens at the follicle, and trimming the ends has no effect on that. Regular trims do prevent split ends travelling up the shaft, so hair retains length better, which can make it seem like faster growth.

Does hair grow faster when it’s longer?

No, the rate stays roughly constant. Longer hair can seem to grow more slowly because a centimetre is a smaller proportion of the total length.

Can supplements speed up hair growth?

Supplements help most when you’re correcting an actual deficiency. If your nutrition is already adequate, they’re unlikely to accelerate growth beyond your natural rate.

Why has my hair stopped growing?

Often it hasn’t stopped, it’s reached the length where your growth phase ends, or breakage is matching growth. If hair genuinely stops growing alongside shedding, it’s worth investigating the cause.