Your Own Calculated Metrics

Custom formulas let you define mathematical expressions that create new plots on your fitness charts. Search for "Formula" when adding a plot, then use the pencil icon to write your expression. Insert fields directly with the "Add Plot" button and pick from built-in functions via the "Function" dropdown.

• Full mathjs library support: arithmetic, exp(), mean(), and many more functions
• Multi-line expressions where the last line returns the value
• Variables persist between days, enabling rolling calculations like exponential moving averages
• "Pre days" parameter to include historical data before the visible date range
• Access athlete variables such as height for calculations like BMI
• Null coalescing operator (??) for graceful handling of missing data
• Plots with arguments prompt for parameter values at display time
• No JavaScript required — just simple math expressions