Biorhythm Calculator

Just enter your date of birth and the date to check to see your physical, emotional and intellectual biorhythms as percentages. A 14-day trend chart and table make good days and critical days easy to spot at a glance.

Input

Date of birth

YYYY/MM/DD

Date to check (reference date)

YYYY/MM/DD

Each cycle — physical (23 days), emotional (28 days) and intellectual (33 days) — shows that day's condition on a scale from −100% to +100%.

Result

Enter your date of birth and the date you want to check.

How it works

Just pick your date of birth and the date you want to check (the reference date) to automatically compute three rhythms: physical (23-day cycle), emotional (28-day cycle) and intellectual (33-day cycle).
Each rhythm is shown from −100% to +100%, color-coded as high on the positive side, low on the negative side, and a critical day near zero where the cycle switches direction.
You can review the trend for the days before and after the reference date in both a chart and a table, so you can anticipate when your condition is likely to rise or fall.
The calculation uses the standard biorhythm theory of a sine wave based on the number of days elapsed divided by each cycle length.
Biorhythms are not scientifically proven; please enjoy them only as entertainment and a rough guide for self-management.
Set the check date to the same day as your birthday or any later date. You can calculate for past dates or future plans alike.

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