ATR (Average True Range)

ATR (Average True Range) is a technical indicator that quantifies market volatility by calculating the average of true ranges over a specified period, typically 14 bars.

Quick Definition Box

ATR tells you how much an asset typically moves per period (e.g., per day or per hour) in absolute price terms. A higher ATR means more volatility; a lower ATR means calmer conditions. It does not indicate direction—only the size of price swings.

Detailed Explanation

The Average True Range was developed by J. Welles Wilder Jr. in 1978 and introduced in his book New Concepts in Technical Trading Systems. It was designed to measure volatility independent of price gaps and direction.

To understand ATR, you first need the True Range (TR) for each period. TR is the greatest of three values:

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 inclusion of the previous close ensures that gaps (where the market opens beyond yesterday's range) are captured. For example, if a stock closes at $100, then gaps up to open at $105 and trades between $104 and $108, the TR would be max(108-104=4, |108-100|=8, |104-100|=4) = 8. The gap of $5 from the close to the open is included in that 8-point range.

ATR is then the moving average of TR over N periods. The default is 14 periods (days on daily charts, hours on hourly charts, etc.). Wilder originally used a smoothing method (Wilder's smoothing), but most charting platforms now offer both simple and exponential moving average options for ATR.

Let's calculate a simple 3-period ATR for clarity:

• Day 1: High 50, Low 45, Previous Close 48 → TR = max(5, |50-48|=2, |45-48|=3) = 5
• Day 2: High 52, Low 49, Previous Close 50 → TR = max(3, |52-50|=2, |49-50|=1) = 3
• Day 3: High 55, Low 48, Previous Close 52 → TR = max(7, |55-52|=3, |48-52|=4) = 7

ATR(3) = (5 + 3 + 7) / 3 = 5.0

So on average, this asset moved 5 price units per day over those three days.

ATR is expressed in the same units as the price. For EUR/USD, ATR might be 0.0012 (12 pips). For a $200 stock, ATR might be $4.50. This makes ATR comparable across timeframes but not directly comparable across different assets with different price levels.

Real-World Example

Consider the daily chart of a fictional stock, XYZ Corp, currently trading at $150.

• On Monday, ATR(14) = $3.20
• On Tuesday, the company announces a surprise earnings miss. The stock drops from $150 to $142, with a daily range of $9. The new TR is $9 (since the high-low range is $9, and the gap from Monday's close of $150 to Tuesday's high of $149 is only $1, so the high-low range dominates).
• After Tuesday, the new ATR(14) calculation will include that $9 TR, replacing the oldest TR (say it was $2.50). The new ATR will rise significantly—let's say to $4.10.

Now, a trader using ATR for stop placement might have had a stop-loss at $146 (about 1.25 × ATR below entry). After the volatility spike, that stop would have been hit. A trader who recalculates stops based on the new ATR of $4.10 might place a stop at $145.90 (entry $150 − 1 × ATR) or $144.50 (entry $150 − 1.5 × ATR), giving the trade more room to breathe.

Conversely, if XYZ then trades quietly for two weeks with daily ranges of $1.50–$2.00, the ATR will gradually decay back toward $2.50–$3.00, reflecting the lower volatility.

Why It Matters for Traders

ATR serves three primary practical purposes:

1. Stop-loss placement: Instead of arbitrary fixed pip or dollar stops, traders often place stops at a multiple of ATR (e.g., 1.5 × ATR or 2 × ATR) from entry. This adapts to current volatility—wider stops in volatile markets, tighter stops in calm ones. It reduces the chance of being stopped out by normal noise.

2. Position sizing: Since ATR tells you the expected move per period, you can size positions so that a 2 × ATR adverse move equals a fixed percentage of your account. For example, if your account is $10,000 and you risk 1% ($100), and ATR is $0.50 on a $10 stock, you'd buy 100 shares (100 × $0.50 × 2 = $100 risk). This keeps risk consistent across different volatility regimes.

3. Breakout confirmation: A sudden expansion in ATR often accompanies strong breakouts from consolidation. Conversely, a contracting ATR (squeeze) often precedes a significant move. Traders watch ATR rising above its own moving average as confirmation that a breakout has genuine momentum.

ATR is also used in the Chandelier Exit (a trailing stop placed at 3 × ATR below the highest high since entry) and in the Keltner Channel (an envelope around a moving average set at multiples of ATR).

Common Misconceptions

Misconception 1: "ATR predicts direction."
False. ATR is purely a volatility measure. A rising ATR tells you the market is moving more, but it doesn't tell you whether the move is up or down. A falling ATR doesn't mean the market is about to reverse—it could just be consolidating before continuing.

Misconception 2: "Higher ATR means higher risk, so avoid it."
Not necessarily. Higher ATR means larger absolute moves, but if you adjust your position size to account for that volatility, your dollar risk can remain identical. A $5 stock with ATR of $0.30 and a $200 stock with ATR of $8 can both be traded with the same risk per trade if you size accordingly.

Misconception 3: "ATR works the same on all timeframes."
ATR is scale-dependent. A daily ATR of $3 on a stock is not comparable to an hourly ATR of $3 on the same stock. You must always specify the timeframe. Also, ATR on lower timeframes is noisier and less reliable for stop placement than on higher timeframes.

Related Terms

• candlestick
• support-resistance
• moving-average
• rsi

How XM Compares

XM provides ATR as a standard indicator on its MT4 and MT5 platforms, available on all timeframes and asset classes (forex, metals, indices, etc.). The default setting is 14 periods, matching Wilder's original specification. XM also allows customization of the period and the smoothing method (simple or exponential). Traders can overlay ATR on charts alongside other tools like moving averages or RSI. Note that ATR values will differ across assets—for example, EUR/USD daily ATR might be 0.0012, while XAU/USD daily ATR might be 18.50. Always verify current platform features and indicator settings on XM's official website, as they may update over time.

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⚠️ This glossary entry is educational. Forex/CFD trading carries high risk. This is not investment advice.

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