Configurable rolling percentile/quantile plot?

[bronekp]

Thank you!
Pretty sure I can create a formula to do exactly what I wanted.
I didn’t even know that was possible.

Just in case anyone come here looking for something similar:

Easy custom formulas on fitness charts

We (tx @ryandev ) have added support for custom formulas on custom charts on the /fitness page. These are simple math expressions and (hopefully!) easy for non-software developers to write. Here is a BMI chart: [Screenshot 2026-03-04 at 15.19.29] Choose “Custom Charts” → “Add” → “Chart” to add a new custom chart. Then do “Add Plot” and search for “Formula”: [Screenshot 2026-03-04 at 15.15.16] Click the little pencil under “Formula” on the table to exit the expression. Choose “Add Plot” to …