Type how long your coloured hair is, and see how many months it takes to grow out to your natural gray, what a shorter cut saves, and how often each route (covering, blending, growing out, cutting) needs the salon. The growth rate is Cleveland Clinic’s; the salon intervals are quoted from the colourists who publish them.
Going gray from 12 in of colour
About 30 months to all naturalBetween 24 and 36 months at the 4 to 6 inches a year Cleveland Clinic gives; your roots show about ⅜ in of natural colour a month.
Four ways to get there
What colourists say
Growth rate from Cleveland Clinic and Wolff et al. (Deutsches Ärzteblatt); salon intervals and grow-out times quoted from L’Oréal Paris, Dwell Studio Salon, QuickSilverHair, Josh Wood Colour, Karla Osborne, Claudette Markovic and Christopher Naselli. Checked 2026-09-25.
Quick answer: hair grows about 1 cm (⅜ in) a month, so every inch of coloured hair takes about 2½ months to grow out. Twelve inches of colour takes about 30 months to grow out to your natural gray (24 to 36, at the 4 to 6 inches a year Cleveland Clinic gives). Blending with highlights and lowlights softens the line but takes the same months; cutting shorter is the only thing that makes it faster.
How to use it
Measure your coloured hair from the roots at your crown to the ends and type it in. Inches or centimetres both work; type “30 cm” and the page switches to centimetres. If you are thinking about a shorter cut to speed things up, type the length you would cut to. Then tap roughly how much of your hair is gray and the colour you wear now: the drawing shows your own hair month by month, natural colour growing in at the roots, the coloured ends trimmed away. Add how often you colour your roots now to compare it with each route.
The growth rate, and why the answer is a range
Cleveland Clinic says “your hair grows about 1 centimeter per month”, and a review of hair and scalp diseases in Deutsches Ärzteblatt International gives the same: “about 0.3 mm per day, or 1 cm per month”. That is the headline number. Cleveland Clinic’s hair-growth guide also says “on average, your hair grows 4 to 6 inches per year”, which is where the range comes from: the faster end is 6 inches a year, the slower 4. Real hair varies more than that. Wikipedia reports scalp hair growing “between 0.6 cm and 3.36 cm per month”, more slowly with age, so read the months as a plan, not a promise (Cleveland Clinic).
Months to all natural, by length
| Coloured length | Months at 1 cm a month | Range (6 to 4 in a year) |
|---|---|---|
| 2 in (5 cm) | 5 | 4–6 |
| 4 in (10 cm) | 10 | 8–12 |
| 6 in (15 cm) | 15 | 12–18 |
| 8 in (20 cm) | 20 | 16–24 |
| 10 in (25 cm) | 25 | 20–30 |
| 12 in (30 cm) | 30 | 24–36 |
| 14 in (36 cm) | 36 | 28–42 |
| 16 in (41 cm) | 41 | 32–48 |
| 18 in (46 cm) | 46 | 36–54 |
| 20 in (51 cm) | 51 | 40–60 |
| 24 in (61 cm) | 61 | 48–72 |
These match what colourists report. QuickSilverHair says hair “between jaw and shoulders” takes “20-24 months to grow out your gray hair cold turkey”, and “with a pixie or very short cut, it will take 3-9 months”. Josh Wood: “the quickest I’ve ever seen someone transition is nine months, but for most people it takes around 18 months”.
The four routes, and how often each needs the salon
- Keep covering it. Permanent colour over the roots: “you’ll generally need to touch up your roots every four to six weeks” (L’Oréal Paris); “typically every 4-6 weeks” (Dwell Studio Salon). That is 9 to 13 visits a year, and it never ends.
- Grow it out. Stop colouring and trim the coloured ends away as the natural colour grows in. No colour appointments; the line between the two shows until the colour is gone.
- Blend it out. Highlights and lowlights mix the gray into your colour so the root line is soft. Foils need “touch-ups every eight to 12 weeks” (L’Oréal Paris); highlights and lowlights, “touch-ups every 10-16 weeks” (Dwell Studio Salon). That is 3 to 7 visits a year, and the colour still has to grow out: blending changes how the months look, not how many there are.
- Cut it short. The fastest way: “a dramatic pixie cut might be the quickest route to a full head of gray” (Claudette Markovic). Every inch you cut off saves about 2½ months.
Highlights or lowlights?
One colourist’s rule of thumb, which the planner quotes but does not decide by: “If someone is under 50% white hair, I’ll do highlights where they have more white … If they’re over 50% white, I’ll do baby lowlights instead” (Karla Osborne). And from hairstylist Christopher Naselli, in AOL: lowlights “typically are a better gray-blending strategy for blonde to medium brown shades. Very dark hair can be more difficult to blend.” Your colourist will look at where your gray actually grows; most people’s is not even.
Three worked examples
Ten inches of brown colour, grown out at full length: about 25 months (20 to 30). Blending along the way means 3 to 7 salon visits a year instead of the 9 to 13 that covering takes, and the same 25 months.
The same ten inches, cut to three: about 8 months (6 to 9) to all natural. Cutting 7 inches off saves about 17 months.
Five inches of colour: about 13 months (10 to 15).
Common mistakes
- Thinking demi-permanent colour will just fade out. QuickSilverHair: “Semi, Demi, and permanent colors all actually stain your hair so they will ruin your natural grays.” Every coloured inch grows out or is cut.
- Expecting blending to be faster. It is softer to look at, not quicker. Only a shorter cut shortens the months.
- Bleaching the colour out overnight. Karla Osborne warns that one-day transitions “use a lot of lightener and are quite aggressive to the hair”.
- Measuring the wrong hair. Measure where your colour is longest, usually the crown to the ends, not your fringe.
- Treating the months as a promise. Growth varies, and slows with age. Plan with the range.
More on Needle Style
Brown hair with silver highlights, short hairstyles for women over 50 with gray hair, long hairstyles for women over 60, very layered medium hair over 50 and hairstyles for women over 70.
FAQ
What is gray blending?
A colour technique that mixes your gray into your colour with highlights and lowlights instead of covering it, so the regrowth line is soft. Salons quote touch-ups every 8 to 16 weeks for it, against every 4 to 6 weeks for full coverage.
How long does it take to grow out gray hair?
About 2½ months for every inch of colour, at the typical 1 cm a month. Twelve inches takes about 30 months (24 to 36); hair between the jaw and the shoulders, 20 to 24 months by QuickSilverHair’s count; a pixie, 3 to 9 months.
Does gray blending make going gray faster?
No. It makes the months easier to look at, because the line between the gray and the colour is soft, but every coloured inch still has to grow out or be cut. Only a shorter cut is faster.
Should I get highlights or lowlights to blend gray?
One colourist’s rule is highlights under 50% white and lowlights over it, and another notes that lowlights suit blonde to medium brown best. Ask a colourist to look at where your gray grows; most people’s comes in unevenly.
Do silver highlights on brown hair help me go gray?
They can soften the line while your natural colour grows in, which is what gray blending is. They do not shorten the months, and highlights need touching up every 8 to 12 weeks for foils, by L’Oréal Paris’s figure.
What is the fastest way to transition to gray hair?
A short cut. Every inch you cut off saves about 2½ months, and colourists agree that a pixie is the quickest route that keeps any length at all.
How often do I have to colour gray roots?
Every 4 to 6 weeks with permanent colour, by both L’Oréal Paris and Dwell Studio Salon: 9 to 13 appointments a year.