Barber Answers
What Number Haircut Should I Get? How to Pick Your Guard
Short answer: If you are unsure, get a 3 (about 10 mm) or a 4 (about 13 mm): long enough to hide the scalp and most head-shape bumps, short enough to feel like a real change. Go down to a 2 or a 1 only once you have seen your head at the longer length, because you can always take more off but you cannot put it back.
Start one number longer than you think
The safest rule is to pick the number you want, then ask for one above it. Hair looks shorter once it is cut than it does on a chart, and the first pass tells you far more than any photo about how your scalp and skull look underneath.
If the 4 feels too soft, the barber can drop to a 3 in the same visit without starting over. Going the other way means living with the shorter length for two or three weeks while it grows back, which is a long time if it is your first buzz before a wedding or a new job.
How much scalp each number shows
Scalp visibility is what really changes as the numbers drop, and it jumps sharply below a 2. As a rough guide on average-density dark hair:
- 4 and above: no scalp, hair has a soft velvet feel and starts to lie in one direction.
- 3: no scalp in normal light, short and tidy, very forgiving.
- 2: a hint of scalp under bright overhead light, especially at the crown.
- 1: scalp visible up close, reads as a deliberate buzz.
- 0.5 or zero: mostly scalp with a dark shadow, close to a shaved head.
Head shape decides how low you can go
The shorter the guard, the more your skull becomes the haircut. At a 3 or 4, hair smooths over a flat spot at the back, a ridge on top or a dip behind the ears. At a 1, every one of those shows, along with any scars and the shape of your ears.
Run your hand over your head before you choose. If you feel a pronounced bump at the crown or a flat area low at the back, stay at a 3 or longer on top and use shorter numbers only on the sides, where a fade or taper can shape around the bumps rather than expose them.
Hair colour and density change what a number looks like
The same guard can look like two different haircuts on two different people. Contrast between hair and skin is what the eye reads as length, so dark, dense hair over pale skin looks fuller at any number, while light, grey or fine hair looks shorter and shows more scalp.
If your hair is blond, grey or thinning, add a number: a 3 on you may read like a 2 on someone with black hair. If your hair is very coarse or curly, the opposite happens, because each strand stands up and bends, so a 2 can look almost as full as a 3. Our pages on haircuts for thin hair and haircuts for grey hair go further.
Choosing a number for just the sides
For a regular short back and sides, the number on the sides sets the whole character of the cut. A 3 or 4 on the sides with scissor length on top is the classic office cut. A 2 on the sides looks sharper and needs a slightly more frequent trim. Anything shorter than a 2 is usually better done as a fade than as one flat number, because a single short length leaves a visible shelf where it meets the top.
If you want a buzz with some shape, ask for two numbers: for example a 3 on top and a 2 on the sides, blended. That small difference makes the head look rounder and more finished than one guard all over.
- Decide the look: all-over buzz, short sides with length on top, or a fade.
- Pick your target number, then add one for the first cut.
- Tell the barber about any bumps, scars or cowlicks before the clippers start.
- Check the first pass in the mirror, including the back with a hand mirror.
- Go one number shorter if you want more, or stop there.
Seasons, helmets and how often you will come back
Practical life matters as much as looks. A 1 feels great in a humid Mississauga August and cold under a thin toque in January; plenty of men go shorter in summer and add a number or two by November. If you wear a hockey or bike helmet, anything under a 3 tends to show pressure marks and flattened patches less, which is a small bonus.
Shorter numbers also show regrowth faster in proportion. Going from 3 mm to 6 mm in a couple of weeks doubles the length, whereas a 13 mm cut barely changes. Plan to return every two to three weeks for a 1 or 2, and every three to five weeks for a 3 or 4. We cover the full style in our buzz cut guide.
What number haircut should I get: common questions
Is a number 2 haircut too short for work?
In most workplaces, no. A 2 all over reads as neat and deliberate, and with the edges lined up it passes almost any dress code.
What number is a crew cut?
A crew cut usually has a 2 to 4 on the sides with the top left longer, about 2 to 4 cm, and tapered shorter toward the crown. Compare it in buzz cut vs crew cut.
Should I cut my own buzz at home?
An all-over buzz is the easiest home cut, but the back and the neckline are hard to see. Many people do the top themselves and let a barber handle the edges and blend every few weeks.
Will a buzz make my hair grow back thicker?
No. Cutting hair does not change the follicle, so it grows back at the same density and rate. Short regrowth can feel coarser because the blunt ends are stiffer.
