Biorhythm Calculator: Physical, Emotional & Intellectual Cycles
Visualize your life cycles with this Biorhythm Calculator. Charts your Physical, Emotional, and Intellectual waves to identify critical days and peak performance windows.
Status for Target Date
About
The Biorhythm theory suggests that our lives are influenced by rhythmic biological cycles that begin at birth. While considered a pseudo-scientific concept by many, it remains a popular tool for self-reflection and planning. The theory posits three main cycles: a 23-day Physical cycle affecting strength and endurance, a 28-day Emotional cycle governing mood and creativity, and a 33-day Intellectual cycle influencing analytical ability and memory.
This tool calculates the exact position of these sine waves based on your birth date. It highlights 'Critical Days' moments when the cycle crosses the zero line which are traditionally interpreted as days of instability or transition where extra caution might be warranted. Use this visualizer to align demanding tasks with your high phases.
Formulas
Biorhythms are calculated using simple sine functions where t is the number of days lived:
Reference Data
| Cycle Name | Duration (Days) | Positive Phase Attributes | Negative Phase Attributes | Critical Day (Zero Crossing) |
|---|---|---|---|---|
| Physical (P) | 23 | High energy, stamina, resistance to illness | Fatigue, lower endurance, need for rest | Accident prone, physical instability |
| Emotional (E) | 28 | Creativity, cooperation, positive outlook | Irritability, moodiness, sensitivity | Emotional outbursts, conflict risk |
| Intellectual (I) | 33 | Sharp logic, quick learning, focus | Difficulty concentrating, mental fatigue | Bad decision making, error prone |
| Secondary: Intuitive | 38 | Instinct, gut feeling | Doubt, hesitation | Uncertainty |
| Average Phase | Mixed | All cycles > 0 (Rare) | All cycles < 0 (Recharge mode) | Multiple crossings |