Biorhythm Calculator
Visualize your 3 biorhythm cycles—physical, emotional, and intellectual—as graphs based on your birth date
Features
Instantly calculate 3 cycles from birth date
Display physical, emotional, and intellectual condition as numbers and descriptions
Visualize critical days with a 31-day graph
Show waves and markers for 31 days centered on the reference date
Freely change the reference date
Check condition for past and future dates on the fly
Compatibility analysis for two birth dates
Display compatibility across physical, emotional, and intellectual cycles, plus overall score
How to Use
Enter your birth date
Input your birth date to see today's condition across all 3 cycles
Change the reference date if needed
Select a past or future date to see the condition for that day
Check critical days
Use graph markers and the critical days list to understand when your condition changes
Switch to compatibility analysis
Enter your partner's birth date to see compatibility across 3 cycles and overall score
Use Cases
Check condition before important events
Estimate how you'll feel on the day of a competition, exam, or presentation
Adjust schedule to avoid critical days
Plan around days when your condition is expected to change
Check compatibility with friends or partners
Use compatibility scores from two birth dates as conversation starters
Reflect on daily condition and mood
Review past 3-cycle patterns as a reference for reflection
Basic Knowledge
What is Biorhythm
Biorhythm is based on a theory proposed in the late 19th century that posits a person's condition fluctuates in three cycles starting from their birth date: physical (23 days), emotional (28 days), and intellectual (33 days). It is not a scientifically backed prediction, but rather an index designed for entertainment purposes, similar to divination.
How to Read the Graph
- High Phase and Low Phase：According to this theory, periods when the curve is above the center line are called high phases, and periods below are called low phases, representing the rises and falls of the rhythm.
- Critical Days：Critical days refer to days when the curve crosses the center line and transitions from high phase to low phase or vice versa, marking the 'turning points' in this theory.
Safety and Privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
Calculation is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
Your birth date and input suggestions are not stored on the server.
Updates
- update #178
Added biorhythm measurement