Biorhythm Chart Generator
Plot your physical, emotional and intellectual biorhythms around any date on an interactive chart.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the biorhythm calculator with the focus on its chart: three overlapping curves — one per cycle — plotted across a two-week window before and after your chosen date, with a dashed line marking the target day so you can see at a glance where each rhythm sits relative to the rest.
The chart is drawn directly from the same sine-wave math behind the percentage figures, so a curve crossing the centre line marks a traditional 'critical day', while a peak or trough marks the high or low point of that cycle. Watching the shape of the lines over the full fortnight tends to make the pattern easier to read than the numbers alone, especially when two or three cycles happen to cross near the same day.
The graph is rendered as a live, locally-generated SVG the moment you submit your dates — nothing is uploaded or saved. As with the underlying theory, treat the visual as an at-a-glance curiosity: biorhythms have no scientifically demonstrated predictive value, so the chart is a lens on your calendar, not a forecast.
Example. On the birth date itself the physical, emotional and intellectual cycles all read 0%.
Limit. The only periods are 23, 28 and 33 days, and each value is a sine rounded to a whole percent.