Physical cycle formula
- Input
- dias vividos = 10.000
- Expected output
- seno(2π x 10000 / 23) ≈ +65%
Fixed 23-day period.
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what is biorhythm
Biorhythm is a popular theory claiming that three sine-wave cycles, physical (23 days), emotional (28 days) and intellectual (33 days), start on your birth date and repeat forever. It can be calculated with mathematical precision, but has no scientific support for actually influencing real life.
Fixed 23-day period.
Happens every 14 days in the 28-day cycle.
It is a popular theory, not a biological measurement, claiming that body, emotions and mind follow fixed sine-wave cycles that start at birth and never change period. This calculator reproduces the classic formula for curiosity and entertainment only.
No. Astrology uses the position of celestial bodies; biorhythm only uses your birth date and a fixed mathematical formula (sine). They are different theories, but both are treated as symbolic entertainment, with no scientific proof of a real effect.
Because, despite decades of studies attempting to validate it, no real correlation has been confirmed between the cycles and performance, mood or accidents, and the few studies that claimed support contained methodological errors, according to Terence Hines' review (Psychological Reports, 1998).
As curiosity and a self-reflection exercise, sure, it is a tradition more than a century old with elegant math behind it. As a real prediction of your life, no: treat the result as entertainment, not fact.
Enter your birth date to see your cycles.
The dates stay in your browser and are never sent to any server.