A single keratin price tag hides the real number you should plan around: what it costs per year. Because keratin is a recurring service, your annual spend depends as much on how often you re-treat as on the per-session price.
The yearly math
US salon keratin averages $150–$400 per session (StyleSeat 2026). At about $300 every 4 months that is 3 visits a year, and with a 20% tip each visit is roughly $360 - around $1,000–$1,100 a year before travel. If your hair is long or you choose a premium formaldehyde-free service, the yearly total climbs from there.
Cutting it with an at-home routine
An at-home kit ($50–$200) usually covers several applications, so the per-application cost lands near $33. Used about every 3 months plus keratin-safe maintenance, the at-home route is roughly $150–$250 a year - savings of $700–$900. The trade-off is milder, shorter-lasting results and your own time. Run your real prices through the calculator to see your exact yearly figure.