Figuring out your hair type is not about guessing. It is about looking at two separate things: the shape of your hair strand and the amount of oil your scalp produces. The shape determines your curl pattern, while the oil determines your porosity and moisture needs. Once you know both, you can pick products and routines that actually work for your hair instead of wasting money on ones that do not.
What Determines Your Hair Type?
Your hair type is genetic, meaning you are born with it. The shape of your hair follicle determines whether your hair grows straight, wavy, curly, or coily. Round follicles produce straight hair. Oval follicles produce wavy hair. Flattened or ribbon-shaped follicles produce curly or coily hair.
Your hair also has a texture, which refers to the thickness of each individual strand. Fine hair has a small diameter. Medium hair is in the middle. Coarse hair has a large diameter. Texture is separate from curl pattern, and you can have fine curly hair or coarse straight hair.
Density is another factor. Density describes how many hair strands you have per square inch of scalp. You can have high density with lots of strands packed together, or low density where your scalp shows through more easily. Density affects how products sit on your hair and how long styling takes.
How To Tell What Hair Type You Have: The Strand Test
The most reliable way to identify your curl pattern is the strand test. Wash your hair with a clarifying shampoo to remove any product buildup, then let it air dry completely without brushing or touching it. Do not use a diffuser or any styling products. Once dry, examine individual strands.
Look at a single strand against a white background. A perfectly straight strand with no bends is type 1. A strand with a slight bend or “S” shape is type 2, which is wavy. A strand that forms a defined “S” or spiral shape is type 3, which is curly. A strand that forms tight zigzag coils or compressed spirals is type 4, which is coily.
The curl pattern is divided into subcategories labeled A, B, and C. The A category is the loosest within each type. The C category is the tightest. For example, 2A hair has loose waves while 2C hair has waves that almost form ringlets. These subcategories help you refine your routine but are less important than knowing your main type.
One important detail: many people have more than one curl pattern on their head. It is normal to have 2B hair at the nape of your neck and 3A hair at your crown. If this happens, base your routine on your most common pattern and adjust for the others as needed.
Understanding Porosity: The Missing Piece
Curl pattern alone does not tell you how to care for your hair. Porosity does. Porosity describes how easily your hair absorbs and holds moisture. It depends on the condition of your cuticle, the outer layer of your hair shaft.
Low porosity hair has tightly closed cuticles. Water and products sit on the surface rather than sinking in. This hair takes a long time to get wet and a long time to dry. It tends to resist chemical treatments and protein buildup.
High porosity hair has raised or damaged cuticles. Water and products enter quickly but also escape quickly. This hair dries fast, tangles easily, and often feels rough. High porosity is common after bleaching, coloring, or heat damage.
Normal porosity hair sits in the middle. The cuticles are slightly lifted, allowing moisture in while still holding it. This hair holds styles well and responds predictably to most products.
You can test porosity at home with a simple method. Drop a clean strand of hair into a glass of water. If it floats for several minutes, you likely have low porosity. If it sinks immediately, you likely have high porosity. This test is not perfect, but it gives you a general starting point.
How To Test Your Hair Density and Texture
Density is easier to assess than porosity. Look at your part in a mirror. If your scalp is clearly visible through your hair, you have low density. If you can barely see your scalp, you have high density. Medium density falls somewhere between.
Texture is also simple to check. Take a single strand of hair between your fingers and roll it. If you can barely feel it, you have fine hair. If you feel a slight bump, you have medium hair. If you feel a distinct wire-like strand, you have coarse hair.
These two factors matter because they change how your hair behaves. Fine hair gets weighed down easily by heavy oils and butters. Coarse hair often needs richer products to soften. Low density hair benefits from light products that add volume. High density hair can handle heavier creams without looking greasy.
Why Your Hair Type Changes Over Time
Your genetic hair type does not change, but the way your hair behaves can. Hormonal shifts during pregnancy, menopause, or thyroid conditions can alter your curl pattern temporarily. Some people report straighter hair during pregnancy and curlier hair afterward.
Damage changes how hair behaves too. Heat styling, chemical relaxers, and color treatments can permanently alter the structure of the hair strand. This damage can loosen curl patterns or make hair appear frizzy and undefined. The new growth remains your natural type, but the length of the strand may behave differently.
Age also plays a role. Hair naturally becomes finer and drier as you get older. The scalp produces less oil, and each strand may thin. This can make your hair appear less curly or less voluminous than it did in your twenties, even though your curl pattern is the same.
Matching Your Routine to Your Hair Type
Once you know your type, you can choose products that match your needs. Straight and wavy hair usually needs lighter products. Heavy creams or oils can flatten these styles quickly. A lightweight mousse or gel often works better.
Curly and coily hair typically needs more moisture. These hair types produce less natural oil along the length of the strand because the oil from your scalp has a harder time traveling down curved hair. This is why curly hair tends to feel drier than straight hair.
Low porosity hair benefits from heat when conditioning. The heat helps open the cuticle so moisture can enter. High porosity hair benefits from protein treatments and heavier sealants that help close the cuticle and lock in moisture.
There is no single product that works for everyone with the same curl type. Your porosity, density, and texture all influence what your hair needs. Two people with 3B curls may need completely different products because one has fine, low-density, low-porosity hair and the other has coarse, high-density, high-porosity hair.
Common Mistakes When Identifying Hair Type
The biggest mistake is judging your hair type while it is wet. Wet hair looks curlier than dry hair. Always assess your curl pattern on completely dry, product-free hair.
Another mistake is assuming frizz means curly hair. Frizz happens when hair lacks moisture or when the cuticle is damaged. Straight hair can frizz too. Frizz alone does not tell you your curl pattern.
Brushing or combing your hair before checking the pattern distorts it. Brushing breaks up curl clumps and makes waves look looser than they are. Check your pattern on hair that has not been brushed since washing.
Finally, do not rely on online quizzes or photos of other people’s hair. Hair looks different in different lighting and at different lengths. The strand test is the only method that gives you accurate information about your own hair.
Frequently Asked Questions
How do I know my hair type without washing it?
You cannot accurately determine your curl pattern without washing and air drying your hair. Product buildup and styling alter the natural shape of your strands, so the test requires clean, product-free hair.
What is the difference between hair type and hair texture?
Hair type refers to your curl pattern, ranging from straight to coily. Hair texture refers to the thickness of each individual strand, ranging from fine to coarse. They are separate qualities that both influence how your hair behaves.
Can your hair type change as you get older?
Your genetic curl pattern stays the same, but hormonal changes, aging, and chemical damage can alter how your hair behaves. Hair may become finer, drier, or less curly with age, even though the underlying pattern has not changed.
Why does my hair have two different curl patterns?
Having multiple curl patterns on one head is completely normal. Different areas of your scalp have different follicle shapes, so your crown may be curlier than your nape. Base your routine on your most common pattern and adjust for the rest.
