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Calculate your personal biorhythms. Discover your physical, emotional and intellectual cycles to make the most of every day.

Biorhythms are the three vital cycles that, according to the theory initiated by Wilhelm Fliess in the 19th century, regulate your physical, emotional and intellectual state. Each has a different period: 23 days for the physical cycle, 28 days for the emotional, 33 days for the intellectual. This app calculates the current phase of each cycle and tells you whether you are at an optimal moment, a critical one, or in transition for each area.

What are Biorhythms?

The biorhythm theory was formulated in the late 19th century by Wilhelm Fliess, physician and friend of Sigmund Freud, and refined by Hermann Swoboda and Alfred Teltscher in subsequent decades. The idea: from the moment of birth, each person begins to oscillate in three sinusoidal waves that regulate different aspects of their life.

The physical cycle (23 days) governs energy, endurance, coordination and strength. The emotional cycle (28 days) governs mood, sensitivity and affective creativity. The intellectual cycle (33 days) governs memory, mental clarity and analytical capacity. The phase of each cycle (positive, critical or negative) affects your performance in that dimension.

The Three Phases of the Cycle

Positive phase (upper half of the cycle): energy is in your favour in that dimension. If you are in the positive phase physically, it is a good time for sport, physical work and travel. Negative phase (lower half): energy is low; rest rather than push. Critical days (when the cycle crosses zero): greater variability, accidents, impulsive decision-making at extremes.

Days where several cycles coincide at critical are the most sensitive. Days with several cycles at maximum positive are your best moments. The AI displays all cycles at once so you can see the combination for your specific day.

Frequently Asked Questions

Do biorhythms have a scientific basis?
Not in the strict sense. Biorhythms are a 19th-century pseudoscientific theory that has not been supported by rigorous studies. The idea that three universal cycles begin exactly at birth and maintain fixed periods has no biological confirmation. What does exist are circadian rhythms (daily cycles of hormones, temperature, etc.) which chronobiology does validate.
What is the app useful for, then?
As a self-observation tool. Even though the theory lacks scientific backing, many people report that when they follow their biorhythms over months, they find useful correlations between the predicted cycles and their actual state. It works as a symbolic reminder that your energy is not uniform — that there are good days and low days — and that it pays to listen to them.
How can I make the most of my biorhythms?
Schedule important activities in positive phases: intellectual presentations during an intellectual high, physical competitions during a physical high, difficult conversations or dates during an emotional high. Avoid big decisions on critical days: your judgement may be more reactive. And rest more during negative phases instead of forcing results that will not come easily.
Are there other similar personal cycles?
Yes, several. Astrology uses planetary transits over your natal chart (Saturn takes 29 years to complete a circuit, Jupiter 12, etc.). Numerology has personal years (9-year cycles). Each system describes a different pattern of your life over time. Combining them gives more complete panoramas.

Related tools

Lunar Calendar→Numerological Predictions→Destiny Number→Full Natal Chart→Daily Horoscope→All astrology→