# Rogers-Satchell Volatility Rogers-Satchell volatility: an open / high / low / close estimate that stays unbiased when the market drifts, annualised in percent. ## How to read it - Higher values mean larger price swings; lower values a calmer market. - Rising volatility from low levels often comes with breakouts. - Suited to trending markets, where simpler range estimates overstate volatility. ## Key settings - Window 20 bars. - Annualise on (365-day year); off = per bar, in percent. ## Good to know - Drawn in its own pane below the chart.