Biorhythms

Calculate physical, emotional and intellectual cycles from your birth date

Date of birth

What are biorhythms?

Biorhythm theory suggests that human life is governed by three periodic cycles starting from birth.

Physical (23 days) — muscle strength, endurance, coordination. Peak phase is best for sports and physical work.

Emotional (28 days) — mood, intuition, creativity, sensitivity. Peak is ideal for socializing and inspiration.

Intellectual (33 days) — analytical thinking, memory, logic. Peak is best for studying and decision-making.

⚠️ Critical days

A critical day occurs when a cycle crosses the zero line (switching from positive to negative or vice versa). During this time the corresponding system is unstable. Physical critical day — increased injury risk. Emotional — mood swings likely. Intellectual — avoid important negotiations and complex decisions. Days when two or all three cycles are simultaneously critical are especially challenging.