Biorhythm Calculator
From the moment you were born, three great cycles are said to rise and fall on fixed clocks — physical, emotional and intellectual — with a fourth, intuitive, rhythm beneath them. See exactly where each one sits today, and which "critical days" to watch.
How to use the Biorhythm
Biorhythm theory models three cycles said to run from birth on fixed clocks — physical (23 days), emotional (28) and intellectual (33) — with a fourth, intuitive (38), beneath them. It is a self-knowledge curiosity, not medicine.
Getting started
- Enter your birth date and the date you want to check (today by default).
- Each cycle is shown as a percentage from +100% (peak) to -100% (trough).
Reading your result
High phases are your strong windows in that area; low phases call for rest. The riskiest are "critical days", when a cycle crosses zero between its high and low halves and energy is unstable.
Astrologer's tip Plan demanding physical, emotional or mental tasks for the matching cycle's high phase, and ease off on its critical days.