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K18 cost per fl oz

As of July 25, 2026, K18 shampoo, conditioner & hair treatments cost $3.69–$79.06 per fl oz across the 17 live listings we track, with a median of $9.29. That is 100% more expensive than the $4.65 per fl oz median across all 892 shampoo, conditioner & hair treatments we track. Prices re-checked continuously.

Per month: at 6 fl oz a month (6 fl oz a month), that’s about $56/month on K18 — versus $6/month at the cheapest price we track.

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Every K18 shampoo, conditioner & hair treatments we track, cheapest per fl oz first

Frequently asked

How much does K18 cost per fl oz?▾

As of July 25, 2026, K18 shampoo, conditioner & hair treatments run $3.69–$79.06 per fl oz across the 17 live listings we track, with a median of $9.29 per fl oz. The cheapest right now is K18 Damage Shield Color Safe Shampoo - pH Protective Shampoo… at $3.69 per fl oz.

Is K18 good value for shampoo, conditioner & hair treatments?▾

K18 runs about 100% more per fl oz than the market: a $9.29 median against $4.65 across all 892 shampoo, conditioner & hair treatments listings we track. The cheapest shampoo, conditioner & hair treatments from any brand is $1.07 per fl oz — so you're paying a premium for the name.

What does K18 cost per month?▾

At 6 fl oz a month (6 fl oz a month), K18's median price works out to about $56 a month — $669 a year. The cheapest shampoo, conditioner & hair treatments we track would cost $6 a month instead.