Hair Clipper Lengths: Simple Number Guide

Hair clipper lengths use a number system from 0 to 8. Lower numbers cut shorter. Higher numbers leave more length. #1 = 3mm (very short), #4 = 13mm (crew cut), #8 = 25mm (longest). Knowing these numbers helps you get the exact haircut you want.

How Clipper Numbers Work

Each guard number equals a specific hair length left after cutting.

Basic rule: Bigger number = longer hair. Smaller number = shorter hair.

Most clippers use guards #0 through #8. Some brands include #10 and #12 for longer cuts.

According to clipper design basics, this standardized system makes communication easier between barbers and clients.

Complete Length Chart

Some brands offer #10 (32mm) and #12 (38mm) for even longer cuts.

Understanding Each Length

#0 - No Guard: Closest cut possible. Skin shows through. Used for skin fades and bald looks.

#1 - 3mm: Very short. Scalp visible. Common for buzz cuts and fade bases.

#2 - 6mm: Short but scalp less visible. Popular for professional looks and buzz cuts.

#3 - 10mm: Versatile medium-short. Most requested all-over length. Works for most hair types.

#4 - 13mm: Classic crew cut territory. Tidy and traditional. Can style slightly with product.

#5-6 - 16-19mm: Taper and longer styles. Enough length to brush or comb. More styling options.

#7-8 - 22-25mm: Long clipper cuts. Full styling flexibility. Almost reaches scissor-cut territory.

Quality clipper sets include multiple guards for different lengths.

Clipper Lever Explained

Most clippers have a small lever on the side.

What it does: Moves cutting blade closer or farther from guard. Creates in-between lengths.

Closed lever: Cuts shorter. Standard guard length.

Open lever: Adds 1/16" (1.5mm) to guard length.

Example:

• #2 guard closed = 6mm
• #2 guard open = 7.5mm

Barbers use lever positions to blend and fade smoothly between guard numbers.

Popular Haircut Styles by Number

A complete home cutting kit provides all guards needed for these styles.

Choosing Right Length

For thin hair: Use #2 or higher. Lower numbers show too much scalp.

For thick hair: Any number works. Higher numbers (#6-8) give structure while allowing styling.

For daily maintenance: #3 or #4 all over. Easy upkeep, professional appearance.

For low maintenance: #1 or #2 buzz. Cut once, looks good for weeks.

For styling options: #5 or higher. Enough length to brush, comb, or use product.

Guard Care Basics

Cleaning guards:

1. Remove hair after each use
2. Rinse under warm water
3. Let dry completely
4. Store in case or bag

When to replace: Guards last years with proper care. Replace if cracked or teeth broken.

Compatibility: Most brands use similar sizing. Wahl, Andis, Oster guards often interchangeable on standard clippers.

Tools from Bestbomg include durable guards designed for home use.

Learn clipper maintenance for long-lasting performance.

Brand Differences

Wahl guards: Available in plastic (standard) and metal (premium). Metal guards more durable, better for fading.

Andis guards: Magnetic system. Secure fit, won't fall off during cutting. Popular with professionals.

Oster guards: Standard plastic design. Compatible with many clipper models. Affordable replacement option.

All brands follow same basic number system. #2 from any brand cuts approximately 6mm.

Frequently Asked Questions

Is a 2 or 3 longer haircut?

#3 is longer. #2 leaves 6mm (1/4 inch), #3 leaves 10mm (3/8 inch). Each number up adds roughly 3-4mm more hair length.

How long is a number 4 haircut?

13mm or 1/2 inch. Classic crew cut length. Shows hair texture clearly. Still short but enough to see natural color and some styling possible.

How short is a 3 on the sides?

10mm or 3/8 inch. Medium-short length. Neat and clean appearance. Most popular all-over guard for low-maintenance cuts. Doesn't show scalp like #1 or #2.

Which blade is shorter, 3 or 4?

#3 is shorter (10mm). #4 is longer (13mm). Lower numbers always mean shorter cuts. Higher numbers leave more hair length.

What does a #4 haircut look like?

Crew cut appearance. Hair clearly visible, texture shows. About pencil eraser thickness. Short but not buzzed. Professional and tidy without looking military-short.

Is a 3 inch blade enough?

This question confuses guard length with blade size. Guards measure in mm/fractions of inch. Blade size refers to clipper blade width (usually around 2 inches wide). For haircuts, focus on guard numbers, not blade measurements.

Get the Length You Want

Hair clipper lengths follow simple numbering. Lower numbers (0-2) create buzz cuts. Medium numbers (3-5) work for crew cuts and fades. Higher numbers (6-8) allow styling options.

Tell your barber specific guard numbers for exact results. No more confusion about "just a trim" or "not too short."

Browse quality clipper options with complete guard sets for home cutting.

Fischer Ruby

October 13, 2025

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