Master Average True Range. Use volatility data to set smarter stop losses, size positions correctly, and time market entries.
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The Average True Range (ATR) was developed by J. Welles Wilder and introduced in his 1978 book "New Concepts in Technical Trading Systems." It measures market volatility — specifically, how much an asset typically moves in a given period. Unlike most indicators that focus on price direction, ATR has nothing to do with direction. It purely measures the size of price movement.
ATR is calculated as the average of the "true range" over a lookback period (typically 14 periods). The true range is the greatest of: the current high minus the current low, the current high minus the previous close, or the current low minus the previous close.
If ATR on a daily chart reads 2.50, it means the stock typically moves $2.50 per day. This information is essential for setting intelligent stop losses and sizing positions correctly.
Many beginner traders place stop losses at arbitrary levels — "I'll use a 2% stop" — without considering how much the asset normally moves. If a stock normally moves 3% per day (high ATR), a 2% stop will be triggered by normal price fluctuation and the trade will be stopped out even when the original analysis is correct. Using ATR to set stops ensures they are wide enough to let the trade breathe, but not so wide that losses become unacceptable.
A common professional approach is to set stop losses at 1.5× to 2× the ATR below your entry point (for long trades). This gives the trade enough room to survive normal volatility. For example: if a stock is trading at $50 and ATR = $2, a 2× ATR stop would be placed at $46 ($50 – $4). This accounts for normal daily fluctuation.
ATR is also fundamental to position sizing. A common formula: Position Size = (Account Risk %) × Account Size / (ATR × Multiplier). This ensures that every trade risks the same percentage of your account, regardless of how volatile the asset is. High-volatility assets get smaller position sizes; low-volatility assets get larger position sizes.
Markets cycle between periods of low volatility and high volatility. When ATR is at a multi-month low, price is often compressing before a significant move. This is the same concept as the Bollinger Band squeeze. Watching ATR over time gives you insight into where the market is in this cycle.
ATR is a critical risk management tool. This content is educational. Always manage risk carefully.
