Average True Range (ATR): Smarter Stops and Targets

The average true range (ATR) is a volatility indicator that shows how much a stock typically moves per bar, in dollars. A stock with a 14-day ATR of $2.00 has averaged roughly $2.00 of travel per day over the last 14 sessions, counting gaps. Traders use it to place stops outside normal noise, size positions consistently, and set realistic targets.

ATR does not predict direction. It tells you how wide your risk should be, which is why it is one of the most practical tools in swing trading. This guide is educational only, not financial advice: stops can be gapped through, past results do not guarantee future results, and you should manage risk and do your own research.

Key takeaways

• ATR is measured in price units (dollars), not percent, so a $200 stock and a $20 stock with the same ATR are very different volatility profiles.
• A common starting point is a stop 1.5 to 3 times ATR from entry; tighter than that, ordinary daily noise will often stop you out.
• Position size = dollars you are willing to risk divided by the stop distance in dollars, so a wider ATR stop automatically means fewer shares.
• ATR also gives realistic targets: if a stock averages $1.50 a day, a $15 target in three days is unlikely.
• ATR describes magnitude only; combine it with trend, support and resistance to decide direction and location.

What is the average true range (ATR)?

The average true range is a moving average of the true range, which is the largest of three measures for each bar. J. Welles Wilder introduced it in 1978 in his book New Concepts in Technical Trading Systems. It was designed for commodities, where gaps between sessions were common, and it captures them by including the prior close.

The true range for a bar is the greatest of:

1. Today's high minus today's low.
2. The absolute value of today's high minus yesterday's close.
3. The absolute value of today's low minus yesterday's close.

The second and third terms matter when a stock gaps. If a stock closes at $50, gaps up to open at $52 and trades between $52 and $53, the high-low range is only $1, but the true range is $3 (high $53 minus the prior close $50).

How is ATR calculated?

ATR is the average of the last N true ranges, with N usually 14. Wilder's original method smooths it: the first ATR is a simple average of 14 true ranges, and each later value is:

ATR = ((previous ATR x 13) + current true range) / 14

Most platforms do this for you. Differences between platforms (Wilder smoothing versus a simple or exponential average) cause small variations, so compare apples to apples when you use a rule like 2x ATR.

What ATR setting should you use?

14 periods on a daily chart is the default and fine for most swing traders. A shorter setting like 7 reacts faster to a volatility spike; a longer one like 21 smooths out. Pick one and keep it, so your stop rule means the same thing from trade to trade.

How do you read ATR values?

A higher ATR means larger typical moves; a lower ATR means a quieter stock. What is high or low depends on the stock, so compare a stock's ATR with its own history, or divide by price to get ATR percent.

Stock B has a quarter of Stock A's dollar ATR but is much more volatile relative to its price. For comparing stocks, ATR percent is more useful; for placing stops on one stock, dollar ATR is what you use.

Two patterns are worth knowing. Volatility is cyclical: quiet, tight consolidations tend to be followed by expansion, which is why a contracting ATR in a base can precede a breakout. A sudden jump in ATR after news means your old stop distance is out of date.

How do you use ATR for a stop loss?

Place your stop a multiple of ATR beyond your entry or beyond a structural level, so ordinary noise cannot trigger it. The multiple depends on your holding period:

• 1.5x ATR: tight, for short swings and strong trends; more stop-outs.
• 2x ATR: a common middle ground for swing trades.
• 3x ATR: wide, for position trades or volatile names; smaller size.

For a long trade, the stop equals entry minus (multiple x ATR). Better still, anchor the stop to structure and use ATR to check it is not too tight: place it below the pullback low, and if that distance is under about 1.5x ATR, move it lower or skip the trade. For more on this, see where to place a stop loss in swing trading.

How do you size a position with ATR?

Divide the dollar amount you are willing to risk by the stop distance to get the number of shares. This keeps every trade at the same dollar risk whether the stock is calm or wild.

Shares = (Account x Risk %) / (ATR multiple x ATR)

Worked example (hypothetical numbers)

You have a $25,000 account and risk 1% ($250) per trade. A stock trades at $50 with a 14-day ATR of $1.50.

• Entry: $50.00 on a breakout.
• Stop: 2x ATR = $3.00 below, at $47.00.
• Shares: $250 / $3.00 = 83 shares (about $4,150 position).
• Target: 4x ATR = $6.00 above, at $56.00.
• Reward-to-risk: $6 / $3 = 2.0.

Now compare a calmer stock, also at $50, with an ATR of $0.75. A 2x ATR stop is only $1.50, so the same $250 buys 166 shares. Notice the dollar risk is identical, and the volatile stock simply gets a smaller position. That is volatility-based position sizing. For the wider framework, see reward-to-risk and R-multiples.

How do you set profit targets with ATR?

Targets in ATR multiples keep expectations tied to how far the stock actually moves. If the 14-day ATR is $1.50, a target 3 ATR away ($4.50) is a plausible multi-day move; a target 12 ATR away is a stretch that needs a big catalyst.

An ATR target also gives you a quick realism check. If the nearest resistance is only 1x ATR above your entry, there is little room and the reward-to-risk will probably be poor. If the next resistance is 4x ATR above, there is room to run.

What is an ATR trailing stop?

An ATR trailing stop follows price up by a fixed multiple of ATR below the highest high (or close) since entry and never moves down. A popular version is the Chandelier Exit: stop = highest high since entry minus 3x ATR. As the stock rises the stop ratchets higher; if volatility shrinks the stop tightens, and if it grows, the stop widens.

For example, if you entered at $50 and the highest high so far is $58 with an ATR of $1.50, a 3x ATR trailing stop sits at $53.50, locking in at least $3.50 per share. The full method is in the ATR trailing stop guide.

ATR versus Bollinger Bands and other volatility tools

Both measure volatility, but they answer different questions. ATR gives a dollar distance and includes gaps; Bollinger Bands use standard deviation of closing prices around a moving average and show relative price location. Use ATR for risk sizing, and bands for context. See Bollinger Bands explained for the band side.

Common mistakes

• Using the same dollar stop on every stock. A $1 stop is far too tight on a stock with a $3 ATR and far too loose on one with a $0.30 ATR.
• Widening the stop but not shrinking the size. A wide stop with an unchanged share count is simply more risk.
• Placing stops at round numbers. Everyone clusters there; ATR plus structure is more defensible.
• Treating ATR as a signal. It has no direction. A rising ATR can accompany a rally or a crash.
• Ignoring earnings and gaps. ATR is a trailing average, and an earnings gap can exceed it several times over. Stops do not protect against gaps.
• Changing the multiple after the trade starts. Decide before you enter.

The bottom line

ATR turns a vague sense of how choppy a stock is into a number you can plan around: stops beyond the noise, share counts that equalize risk, and targets that fit the stock's actual range. It will not tell you what to buy, but it will keep your risk consistent while you work that out.

StockSetups includes ATR on its paid plans alongside trade plans with entry, stop and target and reward:risk figures, so you can see a volatility-aware stop for each setup on the board. Always verify the levels yourself before acting.