Biorhythm (Entertainment)
Enter birth and calculation dates to view mathematical curves. No assessment of health, mood, ability or risk is made.
Entertainment only. These sine curves are not scientifically predictive and do not measure your physical, emotional or intellectual state. They are not health guidance and must not guide health, safety or important decisions.
Choose a birth date to calculate the entertainment curves.
Cycle chart: ±15 days
- Physical cycle (23 days)
- Emotional cycle (28 days)
- Intellectual cycle (33 days)
Cycle chart: ±15 days
| Day offset | Physical cycle (23 days) | Emotional cycle (28 days) | Intellectual cycle (33 days) |
|---|
100 × sin(2π × d / T); T = 23, 28, 33
A QUICK WALKTHROUGH
How to use this tool
- Enter your birth date.
- Choose a calculation date, or leave it blank for today.
- View the three percentages and the 31-day curve chart as entertainment.
Source-defined formula
Each value is 100 × sin(2π × days since birth ÷ period). Periods are 23, 28 and 33 days; the labels are traditional names, not measurements.
Date-only local calculation
Calendar fields use UTC arithmetic to avoid daylight-saving shifts. Blank calculation date uses your browser’s local calendar today. No dates are uploaded or stored.
GOOD TO KNOW
Common questions
Can these curves predict health or performance?
No. They are entertainment calculations without scientific predictive validity, and are not health guidance.
What does a negative percentage mean?
Only that the mathematical sine curve is below zero. It does not indicate illness, poor ability or a risky day.