Color Correction Cost Calculator

Zero triggers automatic session estimation from the level gap and tone condition (lines 14-19). Any positive override skips that logic entirely and uses your entered session count as-is, though Difficulty Rating and Total Timeline still respond to Current Hair Level, Target Hair Level, and Current Tone Condition because those inputs feed the difficulty formula and the weeks-between-sessions rule independently of how sessions were chosen.

When sessions are auto-estimated, Uneven or Banded tone adds one session on top of the level-based estimate (line 17). Difficulty Rating always adds three points for banded tone, one point for warm or brassy tone, and two more when the level gap exceeds four (lines 30-34). Neutral and cool or ashy tones carry no tone penalty in either formula.

The calculator assumes four weeks between visits when the level gap is greater than three, and six weeks otherwise (line 26). Total Timeline multiplies that interval by one less than the session count, because the clock runs only between appointments, not before the first or after the last (line 27).

Each session costs labor plus products: Stylist Hourly Rate multiplied by Average Session Length, plus Product Cost per Session (lines 21-22). Total Estimated Cost is that per-session total times Sessions Needed (line 23). Total Labor Cost and Total Product Cost apply the same session multiplier to each component separately (lines 42-43).