How to Identify Your Hair Type (The Complete Guide)

Have you ever bought a product because someone with hair that looked just like yours loved it - only to wonder why it did absolutely nothing for you?

The reason may be that hair type is about much more than whether your hair is straight, wavy, curly, or coily.

Understanding how your hair behaves can make it easier to choose products, communicate with your stylist, and build a routine that actually works for your hair.

There are four characteristics I like to start with:

• Hair pattern — whether your hair is straight, wavy, curly, or coily

• Density — how much hair you have

• Strand thickness — whether your individual strands are fine, medium, or coarse

• Porosity — how your hair interacts with water, conditioning, and products

Let's break each one down.

1. Hair Pattern: Straight, Wavy, Curly, or Coily

Your natural hair pattern describes the shape your hair forms when it's allowed to dry without being manipulated by heat styling.

Hair is commonly grouped into four broad patterns:

Straight Hair
Hair dries mostly straight without a noticeable wave or curl pattern.

Wavy Hair
Hair forms loose bends or S-shaped waves rather than drying completely straight.

Curly Hair
Hair forms more defined curls, loops, or spirals.

Coily Hair
Hair forms tight curls, coils, or zigzag patterns.

You can also have more than one pattern on the same head of hair, which is completely normal.

Why Hair Pattern Matters

Your natural pattern can influence how your hair responds to styling, how easily scalp oils travel along the strand, how prone your hair is to tangling or frizz, and which styling techniques work best.

But your curl pattern alone doesn't tell you what products your hair needs.

Two people can both have wavy hair and need completely different routines because their density, strand thickness, porosity, chemical history, and styling habits are different.

2. Hair Density: How Much Hair You Have

Hair density describes how many individual strands of hair are growing on your scalp.

This is different from the thickness of each individual strand.

Someone can have very fine strands but a lot of hair overall. Someone else can have coarse strands but lower density.

You can get a general idea of your density by looking at your hair when it's dry and relatively product-free.

Lower Density
Your scalp may be relatively easy to see through your hair.

Medium Density
Some scalp may be visible, but your hair doesn't feel particularly sparse or exceptionally full.

Higher Density
It may be more difficult to see your scalp because you have more strands growing within the area.

Your part, hair color, natural pattern, and styling can all affect how visible your scalp appears, so think of this as a general at-home assessment rather than an exact measurement.

Why Density Matters

Density can influence:

• Haircut shape and layering

• How much product you need

• Drying and styling time

• How easily products weigh your hair down

• How full or voluminous your hair appears

And remember:

Fine hair and thin hair aren't the same thing.

Fine describes the diameter of an individual strand. Thin is commonly used to describe having less hair overall.

3. Strand Thickness: Fine, Medium, or Coarse

Strand thickness describes the diameter of an individual hair strand.

Take a single shed strand and gently feel it between your fingers.

Fine Hair
The individual strand may be difficult to feel and can be more easily overwhelmed by heavy products.

Medium Hair
The strand feels more noticeable and often falls somewhere between fine and coarse.

Coarse Hair
The individual strand has a larger diameter and may feel more substantial between your fingers.

You may also have different strand thicknesses throughout your head, so don't worry about fitting perfectly into one category.

Why Strand Thickness Matters

Strand thickness can affect:

• How much product your hair tolerates

• How easily your hair becomes weighed down

• Heat-styling choices

• Chemical service considerations

• The amount and types of conditioning and styling products that work well for you

This is why saying “I have thick hair” doesn't always tell us enough.

You might mean you have coarse individual strands, high density—or both.

4. Hair Porosity: How Your Hair Interacts With Water and Products

Porosity describes how readily your hair takes up and loses water and how the condition of the hair's cuticle affects that behavior.

Porosity can be influenced by your hair's natural characteristics as well as chemical services, heat styling, UV exposure, mechanical wear, and accumulated damage.

You'll commonly hear hair described as low, medium, or high porosity, but these are better thought of as useful descriptions of how your hair behaves rather than categories you need to perfectly diagnose.

Signs Your Hair May Behave Like Lower-Porosity Hair

You may notice:

• Your hair takes longer to become fully saturated

• Heavy products easily leave it feeling coated or weighed down

• Product buildup becomes noticeable quickly

• Lightweight product layering tends to work better

Signs Your Hair May Behave Like Higher-Porosity Hair

You may notice:

• Your hair becomes wet readily

• It may lose moisture quickly

• Hair can feel rough or become tangled easily

• Chemically processed areas may behave differently from your natural hair

• Products may seem to absorb easily without always leaving the hair feeling conditioned

What About Medium Porosity?

Hair that behaves somewhere in the middle may become wet relatively easily, retain conditioning well, and tolerate a variety of products without becoming quickly coated or feeling chronically dry.

And your porosity doesn't necessarily have to be the same throughout your hair.

For example, your natural new growth may behave differently from previously lightened or chemically treated ends.

Skip the Glass-of-Water Test

You've probably seen the popular porosity test where you drop a strand of hair into a glass of water and determine your porosity based on whether it floats or sinks.

I wouldn't rely on it.

Surface oils, product buildup, trapped air, and characteristics of the individual strand can all affect what happens in the glass.

Instead, pay attention to how your hair actually behaves during washing, conditioning, drying, and styling.

Does it take a while to become completely wet? Do products tend to sit on the hair and leave it coated? Does your hair become wet quickly but seem to dry out again just as fast?

Those patterns can tell you much more about your hair than whether one strand floats.

How the Four Characteristics Work Together

This is where understanding your hair becomes really useful.

These characteristics don't exist independently.

You might have:

Wavy hair + high density + fine strands + lower porosity

while someone else has:

Wavy hair + low density + coarse strands + higher porosity

Both people have wavy hair, but they may need completely different products, haircuts, and styling routines.

That's why copying someone's entire routine simply because their hair looks similar to yours doesn't always work.

And these four characteristics aren't the only things that matter.

Your scalp, chemical history, heat styling, environment, haircut, lifestyle, and personal goals can all affect what works best for your hair.

Understanding Your Hair Is the Starting Point

You don't need to perfectly label your hair to take better care of it.

Instead, start paying attention to how it behaves.

Ask yourself:

What's my natural pattern?

How much hair do I have?

How thick are my individual strands?

How does my hair respond to water, conditioning, and styling products?

Then consider what your hair has been through—color, lightening, heat styling, environmental exposure, and everyday wear.

Together, those clues give you a much better foundation for choosing products and building a routine than simply saying, “I have curly hair” or “I have thick hair.”

Continue the Hair Fundamentals Series

This guide is just the starting point.

Throughout my Hair Fundamentals Series, we'll dive deeper into density, strand thickness, porosity, product selection, conditioning versus strengthening, buildup, and how to build a routine around the way your hair actually behaves.

The goal isn't to collect more hair-care rules.

It's to understand your hair well enough to make better choices for it.