Dog Clipper Blade Sizes Explained: What Each Number Means

Quick Answer

Dog clipper blade numbers indicate how close the blade cuts: the higher the number, the shorter the cut. For example, a #10 blade leaves hair about 1/16 inch long, while a #7 leaves about 1/8 inch. Choose your blade based on your dog's coat type and the desired look.

If you've ever looked at a pack of dog clipper blades and wondered what the numbers mean, you're not alone. Each number corresponds to a specific cutting length, and understanding this can save you from accidental close shaves or uneven trims.

This guide breaks down the most common blade numbers, explains how they relate to hair length, and offers practical tips on choosing the right blade for your dog.

What Do the Numbers on Dog Clipper Blades Mean?

Blade numbers are standardized across most major brands, so a #10 blade from one manufacturer generally cuts the same length as a #10 from another. The number typically indicates the spacing between the teeth and the cutting edge, which determines how close the cut is.

Lower numbers like #3 or #4 leave longer hair (around 1/2 to 3/8 inch), while higher numbers like #7, #10, or #15 cut much shorter. For most home grooming, a #10 blade is a safe starting point because it's versatile and less likely to irritate sensitive skin.

• If you want a longer plush look, choose a #3 or #4 blade.
• For a short, neat trim, a #7 or #10 blade works well.
• For very close shaving (like surgical prep), use a #15 or #30.

Common Blade Numbers and Their Cut Lengths

Here's a quick reference for the most common blade numbers and the approximate hair length they leave after cutting. Keep in mind these are approximate; actual results can vary based on coat texture and the blade's sharpness.

A #3 leaves about 1/2 inch, #4 leaves 3/8 inch, #5 leaves 1/4 inch, #7 leaves 1/8 inch, and #10 leaves 1/16 inch. Blades like #15 and #30 are extremely close and are usually reserved for specific areas like pads or sanitary trims.

• For body trims, many groomers recommend a #7 for a short, even cut.
• Use a #10 for areas that need a closer shave, like the belly or face.
• Always test on a small area first to avoid a too-short cut.

How to Choose the Right Blade for Your Dog's Coat

Coat type matters. For thick, double-coated dogs like Huskies, a #10 blade is often too short for the outer coat, but it's great for the belly and sanitary areas. A #7 or #4 blade might be better for the body to avoid leaving the skin exposed.

For fine or single-coated breeds like Poodles, a #10 is commonly used for a close clip, while a #5 or #7 offers a slightly longer finish. If your dog has matted fur, you may need to use a #10 or even a #15 to get under the mats safely.

• For double coats, avoid shaving too close to prevent sunburn and skin irritation.
• For curly or fine coats, a #7 is a good balance between length and neatness.
• If the coat is heavily matted, a #10 with a guard comb can help prevent skin nicks.

Quick Tips for Successful Blade Use

Match the blade to the coat

For thick coats, use a longer blade like #4 or #7 to avoid skin irritation. For fine coats, #10 is safe and versatile. Test on a small patch before doing the whole body.

Keep blades sharp

Dull blades can pull hair and cause discomfort. Replace or sharpen blades regularly. If the clipper seems to tug, check the blade.

Use guard combs for adjustability

Snap-on combs like the Andis 9 Pc Small Set allow you to change lengths without switching blades, saving time and money. Start with the longest comb and work shorter if needed.

Useful Products for Blade Selection and Grooming

• Andis 9 Pc Small Set – Blue: 1/16′′, 1/8′′, 3/16′′, 1/4′′, 5/16′′, 3/8′′, 7/16′′, 1/2′′, 9/16′′. Works best with blades size 40, 35, 30 & 10. These snap-on combs let you adjust cut length without switching blades, giving you flexibility for different coat types and desired looks.
• Dr. Pol Easy Clip Starter Kit: Cordless operation with up to 2 hours of runtime, powerful rotary motor, detachable blade system with #10 blade and guard combs, quiet operation, lightweight and ergonomic design. A starter kit with a #10 blade and guard combs is perfect for beginners, offering safety and versatility for learning to groom at home.
• DBLC2 Lithium Ion Replacement Battery: Lithium ion chemistry for reliable, long-lasting power. Direct replacement for compatible clipper models. Verify fit before purchase. If your clipper's battery wears out, a replacement battery keeps your grooming tool running, so you won't have to buy a whole new clipper.

Understanding dog clipper blade numbers is key to achieving the right look for your dog and avoiding grooming mishaps. Use the chart and tips above to make informed choices, and always prioritize your dog's comfort with sharp blades and appropriate lengths.