Standing in the aisle staring at numbered plastic combs is confusing. Whether you’re cutting your own hair or learning to cut your kid’s, the clipper guard size chart below breaks down exactly what each number leaves behind. No fluff, just the measurements that matter for buzz cuts, fades, and everything between.
Clipper Guard Size Chart: From #0 to #8
Each guard number corresponds to a fraction of an inch, and a “half” guard fits between the standard sizes for fade blending.
Here’s the complete breakdown of standard clipper guard sizes in both inches and millimeters. Wahl’s guide comb reference uses this exact U.S. inch-based mapping.
| Guard Number | Hair Length Left | Best For |
|---|---|---|
| #0 / no guard | Skin-close (0 mm) | Bald fades, skin-close finishes |
| #0.5 | 1/16 in (1.5–1.6 mm) | Fade blending, very tight buzz |
| #1 | 1/8 in (3 mm) | Short buzz cuts, fade bases |
| #1.5 | ~3/16 in (4.5–4.8 mm) | Transitional fade length |
| #2 | 1/4 in (6 mm) | Classic short buzz cut |
| #3 | 3/8 in (10 mm) | Crew cuts, conservative short cuts |
| #4 | 1/2 in (13 mm) | Medium crew cut, summer length |
| #5 | 5/8 in (16 mm) | Tapering, longer short cuts |
| #6 | 3/4 in (19 mm) | Maintaining length, blending |
| #7 | 7/8 in (22 mm) | Bulk control on thicker hair |
| #8 | 1 in (25 mm) | Longest standard guard |
Published millimeter values vary slightly by source because some round to the nearest whole number while others list precise conversions. The #1 shows up as 3 mm or 3.2 mm depending on where you look — both describe the same 1/8-inch guard.
What Each Guard Number Does to a Haircut
Guard numbers increase with hair length, so higher numbers leave more hair on the head. The right choice depends on the style you’re after, not just the number itself.
#0–#2: The tight zone. No guard at all (bare blade) gives a skin-close shave for bald fades. A #0.5 or #1 leaves a fine stubble-like layer, and #1–#2 are the go-to lengths for short buzz cuts and fade work. These are the numbers barbers use to blend from skin up into longer hair.
#3–#4: The everyday range. These are the most common guards for crew cuts and conservative short styles. A #3 (3/8 inch) is the classic “high and tight” length, while a #4 (1/2 inch) feels a bit more forgiving and is a popular summer choice.
#5–#8: The length keepers. If you’re maintaining a longer cut or tapering the back and sides, these guards remove bulk without leaving you looking shorn.
Why Guard Sizes Aren’t Always Identical Across Brands
For everyday haircuts the difference is invisible, but for precise fade work it explains why barbers stick with one clipper system.
And if you’re ready to buy, our roundup of the best clippers with guards covers the models worth your money.
How to Use a Clipper Guard Correctly
Guard combs snap onto the clipper blade and ride along the scalp, letting hair pass through at a fixed length. The comb lifts the blade off the skin so it can’t cut closer than the guard’s measurement.
Start with a longer guard than you think you need. You can always go shorter, but you can’t put hair back. Run the clipper against the direction of hair growth in smooth, overlapping passes. Check the length in a mirror after the first pass before committing to a full cut.
Keep the guard snapped on securely; a loose guard can shift mid-cut and leave an uneven line. Clean hair out of the comb teeth every few passes so it keeps gliding smoothly.
References & Sources
- Wahl USA. “Guide Combs.” Standard U.S. guard-to-length reference from a major clipper manufacturer.
- Wahl UK. “Clipper Cutting Lengths.” Confirms the inch-to-millimeter mapping for the same guard numbering.