Wash Frequency Calculator

How it works

Washing does two different jobs. On the scalp, shampoo removes oil, sweat, dead skin and product. On the lengths, it resets build-up — but it also strips some of the oil that protects the hair. The right schedule balances those two jobs, and that balance shifts with your curl pattern, your scalp and what you put on your hair.

1. A starting point for your hair type

Natural oil from the scalp moves easily down a straight or wavy strand but slowly along a tightly coiled one. That’s why wavy hair tends to look greasy sooner and coily lengths tend to feel dry long before the scalp feels dirty. The calculator starts from typical ranges stylists use: every 2–4 days for wavy hair, 3–7 for curly, 7–10 for coily, 5–7 for relaxed hair, and 7–14 days with braids, twists or a wig. So if you’re asking how often you should wash 4C hair, the honest starting answer is about once a week to every ten days — then your scalp fine-tunes it.

2. Adjusting for your scalp

Your scalp has the final say. An oily scalp shortens the gap by about 40%. A dry scalp gets a little more time and a gentle cleanser. A flaky or itchy scalp is never stretched past a week, because regular cleansing is one of the main ways common flaking is managed — and if flakes or itch don’t settle, a dermatologist can find out why.

3. Sweat, styles and build-up

Two or three sweaty workouts a week nudge the schedule shorter; four or more shorten it by about a quarter, with water rinses or co-washes in between instead of extra shampoos. Heavy butters, waxes and non-water-soluble silicones need stronger cleansing to come off, so the calculator avoids your longest gap and suggests clarifying every 2–3 weeks. Hard water adds a mineral film, which a chelating shampoo removes.

4. Co-washing and clarifying

Co-washing (washing with conditioner) is useful for dry curly and coily lengths between shampoos, but it is not a scalp cleanser. For oily or flaky scalps the tool tells you to condition the lengths only. Clarifying is a deeper cleanse — monthly for most people, more often when products or water leave residue.

Limits

• These are starting ranges. If your scalp itches, smells or flakes before wash day, wash sooner.
• Scalp conditions such as seborrheic dermatitis or psoriasis need a dermatologist’s plan; this tool can’t tell them apart.
• After a relaxer or color service, follow your stylist’s instructions for the first wash.