Barber Answers
Clipper Guard Numbers Explained: A Size Chart in mm and Inches
Short answer: Clipper guard numbers tell you how long the hair is left after a pass: a 1 leaves about 3 mm (1/8 in), a 2 about 6 mm (1/4 in), a 3 about 10 mm (3/8 in), a 4 about 13 mm (1/2 in), and so on in steps of roughly 3 mm up to an 8 at about 25 mm (1 in). Brands vary slightly, and the clipper lever adds a half step.
The guard size chart
Each whole guard number adds about an eighth of an inch, or roughly 3 mm, of length. The chart below uses the standard sizes most barber clippers follow; your own set may be a millimetre off either way, because manufacturers round differently and some sell metric-labelled guards.
| Guard | Millimetres | Inches | What it looks like |
|---|---|---|---|
| 0 (no guard) | About 0.5 to 2 mm | Under 1/16 | Scalp clearly visible, like heavy stubble |
| 0.5 | About 1.5 mm | 1/16 | Dark shadow, skin still shows |
| 1 | 3 mm | 1/8 | Very short, scalp visible up close |
| 1.5 | About 4.5 mm | 3/16 | Short but covers the scalp on dense hair |
| 2 | 6 mm | 1/4 | Classic short sides |
| 3 | 10 mm | 3/8 | Short, soft to the touch, no scalp |
| 4 | 13 mm | 1/2 | Short-medium, starts to lie down |
| 5 | 16 mm | 5/8 | Hair begins to show direction |
| 6 | 19 mm | 3/4 | Holds a light side part on straight hair |
| 7 | 22 mm | 7/8 | Short-medium length all over |
| 8 | 25 mm | 1 | The longest standard guard |
What zero and the half guards really mean
A zero is simply the clipper with no guard attached, and its length depends on the blade and where the lever sits. With the lever closed, most barber clippers leave something close to half a millimetre; opened fully, closer to 2 mm. That is still not skin, which is why a skin fade needs a zero-gapped trimmer or a foil shaver at the very bottom.
The 0.5 and 1.5 guards fill the gaps at the short end, where a 3 mm jump is very visible. Going straight from a zero to a 1 on dark hair leaves an obvious band; putting a 0.5 between them halves the jump. Many barbers also carry a 2.5 or 3.5 for the same reason higher up, though those sizes are less standard between brands.
Lever open vs lever closed
The lever on the side of the clipper moves the cutting blade, and it changes the length by roughly half a guard. Closed is the shortest setting for any guard; open leaves the hair about 1 to 1.5 mm longer. So a 1 with the lever open behaves close to a 1.5, and a 2 open sits between a 2 and a 3.
When you ask for a guard at home or in a new shop, say which way you want the lever if it matters to you. "A 2, lever closed" is precise. "A 2" on its own will usually be cut closed, but some barbers default to open on the sides of a regular haircut.
How guard numbers build a fade
A fade is a staircase of guard numbers with the steps sanded smooth. A typical mid skin fade might run from skin at the bottom, through a 0.5, 1, 1.5 and 2, up to a 3 or 4 on the upper sides where it meets the top. Each guard goes a little lower than the one above it, and the lever is used to soften the ridge between each pair.
That is why you rarely hear a barber describe a fade as a single number. The number that matters to you is usually the top one, meaning how long the sides are before the fade starts, plus the finish at the bottom. Our explainer on how barbers blend a fade walks through the guard sequence in detail.
- Skin to 2: a tight, high-contrast fade that suits short tops.
- 0.5 to 3: a softer shadow fade with a gentler slope.
- 1 to 4: a long, gradual fade that reads almost like a taper.
- Taper only: a 1 or 2 at the sideburns and nape, with scissor or 4-plus length everywhere else. See our taper fades service.
Why your 2 at one shop looks different at another
Guards are cut to the manufacturer's spec, not to one industry standard, so a 2 from one brand might leave 6 mm and from another closer to 6.5 mm. Blades also differ: a fade blade sits slightly closer than a taper blade, which shifts every guard on that clipper a touch shorter.
Hair itself changes the result. Coarse or curly hair stands up and looks longer on the same guard, while fine straight hair lies flat and shows more scalp. Cutting against the grain, which barbers usually do on the sides, also takes hair a little shorter than cutting with it.
Clipper guard numbers explained: common questions
Which is shorter, a 1 or a 2 guard?
A 1 is shorter. Lower numbers leave less hair, so a 1 leaves about 3 mm and a 2 about 6 mm.
What guard number is a buzz cut?
Most buzz cuts sit between a 1 and a 4 all over. If you have never had one, start at a 3 or 4; our guide to what number haircut to get covers choosing.
Are there guards longer than an 8?
Some brands sell 10 and 12 guards, around 32 and 38 mm, but they cut unevenly on thick hair. Past about 25 mm most barbers switch to clipper over comb or scissors.
What guard is a skin fade?
None. A skin fade goes below any guard: the bottom band is taken to the skin with a zero-gapped trimmer or foil shaver, then blended up through the short guards.
