5. Average True Range (ATR): Volatility-Adjusted Stop Loss Placement
Part of Chapter 07: Oscillators, Indicators & Quantitative Divergences
- True Range calculation accounting for overnight price gaps
- 14-period ATR as a measure of expected daily/hourly dollar movement
- The ATR Multiple Rule: Placing stop losses at 1.5x to 2.0x ATR beyond support
Most retail traders fail because they use arbitrary, static stop losses (e.g., 'I will always use a 2% stop loss'). In high-volatility regimes, a 2% stop gets wiped out by normal market noise; in low-volatility regimes, a 2% stop is far too wide.
Average True Range (ATR), designed by J. Welles Wilder, measures the actual volatility of an asset over the past 14 periods by evaluating the greatest distance between the current high, current low, and previous close.
By setting your stop loss at an ATR multiple (such as 1.5x or 2x the 14-period ATR) below your support level, your stop is mathematically calibrated to withstand random noise while protecting your account from true structural failures.
\text{TR} = \max\big( (H - L), |H - C_{\text{prev}}|, |L - C_{\text{prev}}| \big)Mathematical Explanation: ATR is the exponential 14-period smoothed average of True Range, representing the asset's typical price volatility.
When ATR is unusually high, reduce your position size; when ATR is low, you can safely scale up position size while keeping dollar risk constant.
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All Lessons in Chapter 07
Oscillators, Indicators & Quantitative Divergences (10 Lessons)