I’m curious how WHOOP determines when my next period will begin? Is it just calendar-based, or does it factor in physiological signals too?
WHOOP predicts your period start date using your logged menstrual history, the average cycle length you shared during setup, and real-time data from your device. It looks at patterns from up to six months of logging, factors in changes to skin temp, resting heart rate, and respiratory rate, and adjusts predictions if you’re on hormonal birth control.
Predictions update as new data comes in, so if your cycle is irregular or your period’s running late, things may pause until you log in again. The more consistently you log and wear WHOOP, the smarter and more accurate your insights become.