What is the Average True Range (ATR) Indicator?
The Average True Range (ATR) is a volatility indicator that tells you how much an asset typically moves per bar — including gaps. J. Welles Wilder built it back in 1978, and traders still lean on it 45+ years later because it does one job well: it converts "normal market noise" into a single, usable number.
ATR sits in its own panel below price as one line. When ranges expand, the line rises. When ranges contract, it falls. Default setting is 14 periods. ATR reads in the instrument's actual price units (points, pips, dollars), not on a 0–100 scale like RSI.
An ATR of 2.50 on the ES means something concrete: the average bar moves 2.5 points. You can size positions and place stops off that number.
📌 Key Takeaway: ATR measures the size of price movements — exactly what your stop loss and position size need to know.
How is the Average True Range (ATR) Indicator Calculated?
ATR is calculated from something called True Range (TR), which captures the real size of a bar's movement — gaps included. For each bar, TR is the largest of these three values:
- High − Low (the standard bar range)
- |High − Previous Close| (covers gap ups)
- |Low − Previous Close| (covers gap downs)
The first ATR reading is a simple average of TR over 14 periods. After that, Wilder's smoothing takes over:
ATR = ((Previous ATR × 13) + Current TR) / 14
Wilder's smoothing prevents one massive bar from dominating your ATR for the next 14 sessions. The formula keeps the line responsive to recent volatility without letting a single outlier — FOMC day, earnings gap, news spike — skew everything for a week.
Most charting platforms compute this automatically. You don't need to crunch the math by hand. But understanding the logic — that gaps count, that recent bars matter more than ancient ones — helps you trust the number when you're sizing a trade.
How to Use the Average True Range (ATR) Indicator in Trading?
ATR works best as a risk and trade-management tool. It converts vague trading advice like "give the trade some room" into actual numbers you can defend in your journal.
Here are the four highest-value ways traders use it:
1. ATR-Based Stop Loss Distance
Place your stop a multiple of ATR away from your invalidation point — typically 1× to 2× ATR. If ATR is 2.5 points on the ES and you're using a 1.5× multiple, your stop sits 3.75 points from entry. This distance absorbs routine market noise while still triggering on real invalidation.
2. Volatility-Adjusted Position Sizing
When ATR expands, size down. When ATR contracts, size up. Keep dollar risk per trade consistent regardless of contract size. A trader risking $300 per trade should hold fewer contracts on a high-ATR day and more on a quiet one.
3. Breakout Quality Filter
A "breakout" that moves less than the current ATR isn't a real breakout. Require the breakout bar — or solid follow-through — to cover at least a meaningful fraction of ATR (think 0.5× to 1×) before committing real size.
4. ATR Trailing Stops
In trends, trail your stop behind price by a fixed ATR multiple. The stop widens automatically when volatility expands and tightens when it compresses. This lets winners run without giving back gains on every pullback.
🔥 Pro Tip: Don't use ATR to set hard targets. ATR measures typical volatility, and winning trades exceed it. Use ATR for risk management, position sizing, and filters. Let your setups define your targets.
⚠️ Warning: ATR doesn't tell you which direction price is going. Traders who use it as a trend signal end up with confused entries and worse exits.