How much keratin product do I need?

For medium-length, medium-density hair, approximately 50ml of keratin treatment product is needed. Short hair requires around 30ml while long, thick hair can need 100-150ml. The product should be applied evenly from roots to ends, combing through each section for full saturation without over-application.

How long does a keratin treatment take?

A full keratin smoothing treatment takes approximately 2-3 hours total. This includes washing (15 mins), product application and processing (30-45 mins), blow drying (15-20 mins) and flat ironing section by section (30-60 mins depending on length). Express treatments take 60-90 minutes total.

What temperature should the flat iron be for keratin?

Most keratin treatments require a flat iron temperature of 200-230°C (392-446°F). The heat seals the keratin protein into the hair cuticle. Fine or damaged hair should use the lower end (200°C) while coarse or resistant hair benefits from 220-230°C. Always follow the specific product instructions.

How long does a keratin treatment last?

A professional keratin treatment typically lasts 3-6 months depending on hair type, washing frequency and aftercare. Using sulphate-free shampoo extends longevity. Express treatments last 4-8 weeks. The smoothing effect gradually fades as new hair grows in and the treatment washes out over time.

CutCalcs

Keratin Treatment Calculator — Product & Timing

Estimate keratin product quantity and processing time for smoothing treatments.

Hair Length

Hair Density

Treatment Type

Bottle Size

Typical sizes: 300ml or 500ml

Bottle Cost

Cost per bottle (optional)

How We Calculate This

This calculator estimates the amount of keratin smoothing product needed and the total service time based on hair characteristics and treatment type.

The formula

Product (ml) = Base amount x Density multiplier x Treatment type factor

Total time = Wash + Processing + Blow dry + Ironing

Express treatments use ~60% of full treatment product
Thick hair needs ~40% more product than medium hair
Ironing time scales with hair length

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always perform a strand test before chemical services.