# Garman-Klass Volatility Garman-Klass volatility: an estimate from each bar's open, high, low and close over the window, 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. - Uses the full bar, so it is more efficient than close-to-close 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.