Biorhythm compatibility calculator

Enter two dates of birth to see how closely your physical, emotional and intellectual cycles rise and fall together.

Both dates stay in your browser and are never sent to us.

In step or out of step?

Each of us begins our three cycles on the day we're born, so two people's rhythms are set apart by the days between their birthdays. Some pairs find their highs and lows arriving together, like two waves rolling in side by side. Others are perfectly opposite: one is basking in sunshine just as the other sits under a raincloud.

Because both sets of rhythms travel at the same pace, your compatibility never changes. It was written the day the younger of you was born.

What the cycles say

Just for fun

Biorhythm compatibility has no scientific backing, so please don't base any real relationship decisions on it. It's a light-hearted way to compare notes with a partner, friend or colleague.

← Back to your own biorhythm chart