Biorhythms calculator
Three cycles have been running since the day you were born: the physical one every 23 days, the emotional every 28 and the intellectual every 33. Put in your date of birth and see where you stand on each curve today.
Show the three secondary cycles
Intuition (38 days), the aesthetic (43) and awareness (48) were added by later followers; they are not part of the original biorhythm theory.
Your next critical days
Your best day in the coming month
Biorhythms are a curiosity, not a science: Wilhelm Fliess dreamt them up in the late nineteenth century and they became a craze in the seventies. These curves have never been shown to predict anything, so take them as an entertaining way to look at your month — never as medical advice, and never as a reason to bring forward or put off anything that matters.
The idea behind biorhythms is simple and rather lovely: from the day you were born, three waves would be running, each to its own beat. The physical one repeats every 23 days, the emotional every 28 and the intellectual every 33. When a wave is up, that side of you would be at its best; when it is down, in a flat patch; and where it crosses the middle line — the famous critical day — it would be out of step.
All you have to do here is enter your date of birth. The calculator counts the days you have lived, draws the three curves fifteen days either side of the date you choose, and tells you where you stand on each: the percentage, whether it is rising or falling, and what that stretch is traditionally said to bring. Below that you get your next critical days and your best day of the month, which is what most people come for.
Let us clear up the commonest misunderstanding straight away: a critical day is not a bad day. It means the curve is passing through zero, so that side of you is changing sign. Tradition describes it as a day of clumsy reflexes, a short fuse or absent-mindedness, depending on which cycle is crossing — not as a day of disasters.
And now the honest part. Biorhythms are not a science. They were dreamt up by Wilhelm Fliess, a Berlin ear-nose-and-throat doctor and friend of Freud, in the late nineteenth century, and became a craze in the seventies, when the first pocket calculators made the arithmetic trivial. They have been studied many times and these curves have never been found to predict anything: not accidents, not performance, not moods. Take them for what they are — an entertaining way to look at your month, and as good an excuse as any to rest when resting is what you need — never as medical advice, and never as a reason to bring forward or put off anything that matters.
If you like pulling numbers out of your birth date, right next door are daily numerology, which makes the same gesture with different arithmetic, complete numerology and numerology compatibility.