Luteal Phase Calculator

Free calculate luteal phase length and ovulation timing. This is an educational tool only - always consult a healthcare provider.

Cycle Information

Typically day 14 for 28-day cycle

Results

Enter cycle information to calculate luteal phase

About Luteal Phase

  • • Luteal phase: From ovulation to next period
  • • Normal length: 12-16 days
  • • <10 days: Short luteal phase (possible defect)
  • • >16 days: Long luteal phase (possible pregnancy)
  • • Follicular phase: From period to ovulation