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Lesson 65 of 100•Chapter 07
Quantitative Momentum• 5 mins Read•Level: Intermediate

5. Average True Range (ATR): Volatility-Adjusted Stop Loss Placement

Part of Chapter 07: Oscillators, Indicators & Quantitative Divergences

Core Learning Concepts
  • 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.

Quantitative Formula: True Range Equation
LaTeX Specification
\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.

Institutional Execution Insight

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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