Biorhythm Calculator
Calculate your physical, emotional and intellectual biorhythm cycles.
Assumptions used in this calculation
- For entertainment: Biorhythm theory is not scientifically validated, results are for entertainment purposes.
About this calculator
Biorhythm theory holds that three cycles set in motion at birth continue running for the rest of your life, and that plotting where you sit in each cycle on any given day offers a rough read on your physical, emotional and intellectual state. This calculator counts the exact number of days between your birth date and a target date, then plugs that figure into three sine waves with periods of 23 days (physical), 28 days (emotional) and 33 days (intellectual) to produce a percentage from -100% to +100% for each. Working this out by hand means tracking exact day counts across leap years and running three separate trigonometric calculations, easy to get wrong by a day or two, which shifts every result. The calculator handles the date arithmetic and the sine-wave math instantly so you can see all three cycles for any date without manual computation, though the theory itself is a traditional, entertainment-only framework rather than a scientifically validated model of mood or performance.
Worked example
Born 16 July 1990
Result: Physical, emotional and intellectual cycle percentages
Was this helpful?