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 real biological measurement, that claims three aspects of life (body, emotions and mind) follow fixed sine-wave cycles, starting at birth and never changing period. This calculator reproduces the classic formula purely for curiosity and entertainment.
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.
By default we show today, but you can pick any other date, past or future, to see how the three cycles would look on that day.
Enter your birth date to see the three cycles.
Your birth date and reference date stay in your browser and are never sent to any server.