What haircut numbers mean
Clippers cut hair to a fixed length set by a plastic guard that clips over the blade. Each guard has a number, and the number tells you how much hair is left. The higher the number, the longer the hair.
The standard scale runs from #0 (no guard) to #8 (one inch), with each full number adding roughly an eighth of an inch. Half sizes like #0.5 and #1.5 exist for blending, especially in fades. Anything longer than a #8 is usually cut with scissors.
Many clippers also have a lever on the side that moves the blade. Opening the lever leaves the hair a touch longer, closing it cuts a touch shorter. Barbers use it to split the difference between two guards, which is how a fade gets so smooth.
Clipper guard size chart
These are the common sizes used across most major clipper brands. Brands vary slightly, sometimes by a millimeter, so treat the numbers as a shared language rather than a laboratory measurement.
| Guard | Inches | Millimeters | What it looks like |
|---|---|---|---|
| #0 (no guard) | about 1/32–1/16" | about 0.5–1.5 mm | Scalp clearly visible, just shy of skin |
| #0.5 | 1/16" | 1.5 mm | Fade blending just above the skin |
| #1 | 1/8" | 3 mm | Very short buzz, scalp shows through |
| #1.5 | 3/16" | 4.5 mm | Blending step between #1 and #2 |
| #2 | 1/4" | 6 mm | Short, even buzz |
| #3 | 3/8" | 10 mm | Short but covers the scalp |
| #4 | 1/2" | 13 mm | Short, soft-looking all-over cut |
| #5 | 5/8" | 16 mm | Short sides on a longer cut |
| #6 | 3/4" | 19 mm | Fuller sides, some texture |
| #7 | 7/8" | 22 mm | Longer clipper cut |
| #8 | 1" | 25 mm | Longest standard guard |
How the numbers build a fade
A fade is a ladder of guard sizes. A skin fade might start with a foil shaver or bare blade at the bottom, then move through a #0.5, #1, #1.5 and #2 as it climbs, with each band blended into the next. A fade that stops at a #1 is softer and grows out a little more gently.
This is why "a #2 on the sides" and "a fade starting at a #2" are different cuts. The first is one length all over the sides. The second gets longer as it goes up. For the different heights and shapes, see our rundown of low, mid and high fades.
Picking the right number for you
If you have never had a number before, start longer than you think. A barber can always take more off, but a #1 cannot be undone. A #3 or #4 on the sides is a safe first clipper cut that still looks tidy.
Hair color and density matter too. Dark, thick hair at a #2 looks fuller than fine, light hair at the same number, where the scalp shows more. Cowlicks and the crown usually need a slightly longer guard to lie flat.
The same guards work on beards: many people keep a short beard at a #2 to #4, with the neckline and cheeks cleaned up by hand. The shop page on beard trims and line-ups covers that service.
Using numbers when you ask for a cut
Give the barber the number for the sides, how you want it blended, and the length on top in inches. "Number one on the sides faded up, two inches on top" is clear. Our list of questions to bring to your barber covers the rest, from necklines to parts.
Remember that a number is a starting point, not a contract. Show a photo and say the number you think you want; a good barber will tell you if a different guard will get you closer. At Pearl River Barber Shop on 6 E Central Ave, a haircut is $40, and you can book a clipper or scissor haircut online.