free quiz

Hair Porosity Test

This hair porosity test asks 10 questions about how your hair takes in water and products, then estimates low, normal or high porosity with a confidence score.

Question 1 of 10

When you step into the shower, how quickly does your hair get fully wet?

Slowly — water seems to run off for a whileIt takes a minute or two of rinsingAt a normal paceAlmost instantly — it soaks water right up

What about the float test?

Dropping a clean strand in water and watching whether it sinks is popular, but it isn’t reliable: leftover oils, conditioner, the water’s surface tension and even how you drop the strand change the outcome. We explain it below, but it is not part of this score.

How to use the Hair Porosity Test

Think about how your hair behaves day to day

The test asks about wash day, products and your hair’s history. Answer for the hair you have now — the ends count more than brand-new growth.
Answer the 10 questions

Tap the option that fits each question; the next one appears automatically. If you haven’t tried something, such as the spray test, choose the “not sure” option — it is left out of the score.
Skip the float test

Open “What about the float test?” to see why it isn’t reliable. It does not count toward your result.
Tap “See my porosity”

You get low, normal or high porosity, a confidence percentage and a scale showing where your score falls.
Use your care plan

Read the oil, deep conditioning, protein and cleansing advice and the “Look for” and “Go easy on” lists. Download the PDF care plan or tap “Build my routine” for a matching wash day routine.

How to use the Hair Porosity Test (69 s)

How it works

Each hair strand is wrapped in a cuticle — overlapping layers of flat cells, a bit like roof shingles. When those layers lie tight and flat, water and products struggle to get in but don’t leave easily either: that’s low porosity. When the layers are lifted, chipped or worn away, the strand soaks up water quickly and loses it just as fast: high porosity. Lab studies treat porosity as a physical property of the fiber and show it rises as hair is damaged.

How the score works

In this hair porosity test, every answer has a value from −2 (a strong sign of low porosity) to +2 (a strong sign of high porosity), and each question has a weight — the spray test and your chemical history count most, protein reaction least. We add the weighted values and divide by the highest possible total, which gives a score from −1 to +1:

below −0.25 → low porosity
−0.25 to +0.25 → normal porosity
above +0.25 → high porosity

The confidence figure (35–95%) combines how far your score sits from the nearest boundary, how many of your answers point the same way as the result, and how many questions you could answer (“not sure” answers are left out). Mixed signals usually mean your roots and ends behave differently.

Why chemical and heat history matter

Relaxers, bleach and permanent color work by opening the cuticle and changing the protein inside the strand; research on relaxed hair has measured that damage directly. Repeated high heat from flat irons also degrades the hair over time. That’s why hair that has been relaxed, bleached or pressed often tests high-porosity even if it started out low.

About the float test

The float test — drop a clean strand into a glass of water and see if it sinks — is everywhere online, but it isn’t reliable. Leftover oils and conditioner make hair float; surface tension can hold a strand up regardless of porosity; and the result changes with how long you wait. We describe it because people ask, but it doesn’t count toward your score.

This test is a self-assessment, not a lab measurement. Use it to choose products and habits, then adjust based on how your hair responds.

Low vs normal vs high porosity

	Low porosity	Normal porosity	High porosity
Typical signs	Water beads up; hair is slow to get wet and slow to dry; products sit on top and build up.	Hair wets and dries at an average pace; most products absorb; moisture lasts a few days.	Hair gets wet instantly and dries quickly; feels dry within hours; can feel rough or tangle easily.
Oils	Choose light oils that won’t coat the strand — grapeseed, argan, sweet almond or jojoba — and use a few drops on damp hair.	Most oils work. Medium-weight oils such as olive, avocado or sweet almond suit most strands — use less if your hair is fine.	Heavier oils and butters help seal moisture in — castor, olive, avocado or shea. Coconut oil as a pre-wash treatment has been shown to reduce protein loss.
Deep conditioning	Use gentle heat when you deep condition: a steamer, thermal cap or warm towel for 15–30 minutes helps conditioner absorb.	Heat while deep conditioning is optional. Use it only if a conditioner seems to sit on top.	Extra heat while deep conditioning isn’t needed for absorption. Focus on sealing moisture in afterward instead.
Protein	Go easy. Use light proteins (hydrolyzed proteins, amino acids) only when hair feels limp or mushy — heavy protein often leaves low-porosity hair stiff.	A protein treatment every 4–6 weeks, or whenever hair feels overly soft and stretchy, keeps things balanced.	Light protein every 2–4 weeks can help strengthen weak spots along the strand. If hair turns stiff or brittle, space treatments further apart.
What helps	Lightweight, water-based leave-ins and milks Humectants such as glycerin or aloe (in moderate humidity) Light oils: grapeseed, argan, jojoba, sweet almond Water-soluble silicones or none A clarifying or chelating shampoo now and then	Conditioners that balance moisture with a little protein Medium-weight creams, oils and leave-ins Gentle, sulfate-free cleansers for regular washes A heat protectant before any styling heat	Proteins: hydrolyzed keratin, silk, wheat or rice protein Rich leave-ins and creams Sealing oils and butters: castor, olive, avocado, shea Fatty alcohols (cetyl, cetearyl) for slip and softness A heat protectant before any heat — silicones can help here Film-forming or anti-humidity stylers in humid weather
Go easy on	Heavy butters (shea, mango) near the top of the ingredient list Petrolatum, mineral oil and waxes that sit on the surface Frequent or heavy protein treatments Non-soluble silicones that build up between washes Layering many products in one go	Frequent high heat — it raises porosity over time Harsh sulfate shampoos at every wash Back-to-back chemical services	High heat and frequent flat ironing Bleach and back-to-back chemical services Drying alcohols high in the list (alcohol denat., SD alcohol) Glycerin-heavy products in very humid or very dry weather Rough towels and detangling dry hair

The test asks 10 questions; the spray test and chemical history carry the most weight.

Frequently asked questions

What is hair porosity?

Porosity describes how easily water and products get into the hair strand and how quickly they leave. It depends mainly on the condition of the cuticle — the overlapping outer layer. A tight, flat cuticle means low porosity; a lifted or worn cuticle means high porosity.

Is the float test accurate?

Not very. Whether a strand floats depends on leftover oils and conditioner, the water’s surface tension, the strand’s shape and how long you wait. Clean, damaged hair can float and healthy hair can sink. The questions above are a better guide because they look at how your hair behaves every day.

Can hair porosity change?

Yes. Relaxers, bleach, permanent color, frequent high heat and rough handling all lift and wear the cuticle, which raises porosity over time. You can’t lower porosity permanently, but protein, sealing oils and gentler habits help high-porosity hair behave better — and new growth starts with your natural porosity.

Can you have different porosity in different parts of your hair?

Very often. The ends are the oldest part of the strand and have been through the most washing, heat and styling, so they are usually more porous than the hair near your scalp. If your answers felt different for roots and ends, a lower confidence score is expected.

Is 4C hair always low porosity?

No. Curl pattern and porosity are separate traits. 4C hair can be low, normal or high porosity depending on its cuticle and history. Take our hair type quiz too — but choose products by porosity first.

How do I get moisture into low porosity hair?

Apply products to damp, warm hair right after washing, use lighter water-based leave-ins, deep condition with gentle heat (a steamer or thermal cap), and clarify regularly so build-up doesn’t block absorption.

How do I keep high porosity hair moisturized?

Seal moisture in: follow a water-based leave-in with a cream, oil or butter (the LOC or LCO method), use light protein treatments to strengthen weak spots, and cut back on heat and chemical services where you can.