Average True Range (ATR)

Average True Range measures market volatility by calculating the average of a security's true range — the largest of current high-low, high-prior close, or low-prior close — over a specified period. ATR doesn't indicate direction; it quantifies volatility and is used to set position sizes, stop-loss distances, and profit targets that are calibrated to how much a stock actually moves.

Level: IntermediatePart III - Technical AnalysisPublished Deep Guide

Calculating ATR: True Range and the Wilder Average

J. Welles Wilder introduced Average True Range in his 1978 book 'New Concepts in Technical Trading Systems.' True Range (TR) is the greatest of: (1) Current High minus Current Low; (2) Absolute value of Current High minus Previous Close; (3) Absolute value of Current Low minus Previous Close. The second and third cases capture overnight gaps — a stock that closes at $50 and opens the next morning at $55 has a true range that includes the gap, even if the intraday high-low range is narrow. ATR is the 14-period Wilder exponential average of True Range.

The Wilder smoothing is slightly different from a standard EMA: ATR = [(Prior ATR × 13) + Current TR] / 14. This produces a slower-reacting average than a standard 14-period EMA. In high-volatility environments like earnings announcements or macro shocks, ATR spikes sharply and then decays gradually. In calm trending markets, ATR compresses. Monitoring ATR relative to its own history reveals when markets are transitioning from low-volatility (often preceding big moves) to high-volatility regimes.

Practical Applications: Stops, Targets, and Position Sizing

ATR's primary use is calibrating stop distances to actual market volatility rather than arbitrary dollar or percentage amounts. A commonly used rule is placing stops 2× ATR below entry for long positions. If a stock has a 14-day ATR of $3.50, a 2× ATR stop sits $7.00 below entry. This ensures the stop is outside normal daily noise — a stop at 1× ATR or less is almost certain to be hit by routine fluctuation rather than by actual trend failure. The Chandelier Exit, a popular stop-loss system, uses 3× ATR from the highest high since entry.

Position sizing via ATR implements the core risk management principle: risk a fixed percentage of capital per trade, adjusted for how volatile the specific security is. Position size = (Account risk per trade) / (ATR multiple used as stop). A $100,000 account risking 1% per trade with a 2× ATR stop on a stock with ATR $4.00 yields a stop distance of $8.00 and a position size of ($1,000 / $8.00) = 125 shares. This automatically sizes positions smaller in high-volatility environments and larger in low-volatility ones — exactly the behavior that produces consistent risk exposure across different market conditions.

ATR-based position sizing:

Account = $100,000
Risk per trade = 1% → $1,000
ATR (14-day) = $4.00
Stop multiplier = 2×
Stop distance = 2 × $4.00 = $8.00
Position size = $1,000 / $8.00 = 125 shares
Position value = 125 × current price

ATR as a Volatility Regime Indicator

Comparing current ATR to its 6-month or 12-month average reveals the volatility regime. ATR at 50% of its annual average indicates compression — markets are calm, and option implied volatility is typically low. These periods of ATR compression historically precede volatile expansion moves, though direction is not specified. Breakout traders look for ATR compression followed by a price breakout as a setup where the volatility regime is likely to expand, amplifying the breakout move.

ATR percentile rankings across a universe of stocks can identify which names are the most and least volatile. When screening for swing trades, matching the ATR to your risk tolerance helps filter to stocks where your stop distance won't require either very small positions (overly tight stops on volatile stocks) or accept excessive actual dollar risk (wide stops on high-priced names). AIQ's signal analysis incorporates ATR in its risk scoring, flagging stocks where the signal strength is high but the volatility profile requires careful position sizing.

Key Takeaways

- True Range is the largest of: high-low, |high-prior close|, or |low-prior close| — it captures overnight gaps that plain high-low misses.
- ATR quantifies volatility without indicating direction; it rises in turbulent markets and compresses in calm ones.
- 2× ATR stops place exit points outside normal daily noise; 3× ATR (Chandelier Exit) provides more room for volatile securities.
- ATR-based position sizing automatically adjusts trade size to maintain consistent dollar risk across securities with different volatility profiles.
- ATR compression relative to recent history often precedes significant directional moves — a useful pre-breakout filter.

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Concept FAQs

Should I use ATR for stocks or is it more relevant for futures?

ATR is useful for any liquid market: stocks, ETFs, futures, crypto, or forex. It was originally developed for commodity futures but applies equally well to equities. For stocks, ATR is particularly valuable during earnings season when overnight gaps dramatically expand True Range and require wider stops than normal volatility would suggest.

Why does ATR not tell me the direction of the move?

ATR is a pure volatility measure — it averages the absolute size of price moves without caring about whether those moves are up or down. It answers 'how much does this stock typically move in a day?' not 'which direction will it move?' Direction comes from trend, momentum, and pattern analysis. ATR handles the risk management dimension — how wide to set stops, how large a position to take.

In AIQ

See RSI, MACD, and trend structure live The concepts covered in this guide are the exact factors AIQ surfaces for every stock — apply them with live data rather than in isolation.

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