ATR Indicator Explained: How to Use Average True Range for Stops and Position Size

Introduction

Ask ten traders where to put a stop loss, and you may get ten answers. Many of them might even be using the ATR indicator. It doesn't tell you which way a market will move, but it does show how much it typically moves, and that single number can make your stops, targets, and trade sizes far more realistic.

This guide covers what average true range measures, the ATR formula, how ATR could be used to set a stop loss, how ATR position sizing works, and some ATR settings for different traders.

What Is the ATR Indicator?

The Average True Range (ATR) is a volatility indicator developed by J. Welles Wilder Jr. and introduced in his 1978 book "New Concepts in Technical Trading Systems", the same book that gave traders the RSI. According to Investopedia and StockCharts, Wilder originally designed it for commodities, which often gap and make sharp moves, but it is now used on forex, indices, shares, and crypto.

The key idea is simple. A high ATR usually means prices have been moving a lot from bar to bar. A low ATR indicates the market has been quiet. ATR is non-directional and measures move size, not direction; therefore, ATR can rise in a rally or a sell-off.

Why "true" range?

A normal range is just a candle's high minus its low, which often misses gaps. If gold closes at one price and opens much higher the next day, the gap is part of the real movement a trader experienced. Wilder's "true range" captures it all.

The ATR Formula, Step by Step

For each bar, the true range (TR) is the largest of three values:

• Current high minus current low
• The absolute value of the current high minus the previous close
• The absolute value of the current low minus the previous close

The ATR is then an average of these true ranges, usually over 14 periods. StockCharts explains that the first ATR is a simple average of the first 14 true ranges, and after that Wilder smoothed it like this:

ATR = [(Previous ATR x 13) + Current TR] / 14

You do not need to calculate it by hand. MT5 and most charting platforms include ATR as a built-in indicator, plotted in a separate window below price.

ATR is in price units, not percentages

ATR is shown in the instrument's own units, such as dollars for gold or pips for EUR/USD. This makes ATR values hard to compare between instruments with very different prices. A $300 share will naturally have a larger ATR than a $30 share. If you want to compare markets, some platforms offer ATR as a percentage of price, often called ATRP.

How Traders Use the ATR Indicator

1. Gauging the daily move

If a share CFD has a 14-day ATR of $4, a $1 move during the day is ordinary noise, while a $10 move is unusual. This helps you judge whether a move is significant or just routine.

2. Setting an ATR stop loss

Normal fluctuations easily hit a stop placed too close to entry. An ATR stop loss places the stop a multiple of ATR away from the entry price, so it adapts to current volatility. Common multiples discussed by traders and educators range from about 1.5x to 3x ATR, with 2x often used as a starting point for swing trades. Wider multiples give the trade more room but mean a larger loss if the stop is hit.

Traders regularly debate whether ATR stops are better than fixed percentage stops. A fair summary of that discussion is that ATR stops work best when combined with chart structure, such as placing the stop beyond a support or resistance level.

3. Trailing stops

ATR can also drive a trailing stop generally called a Chandelier Exit, which places a trailing stop a multiple of ATR below the highest high reached since entering a long trade. As price rises, the stop follows, widening or narrowing as volatility changes.

4. ATR position sizing

With position sizing, ATR also becomes a risk management tool. With ATR position sizing, you first decide how much money you are willing to lose on the trade, then let the ATR-based stop distance decide the size:

Position size = Amount at risk / (ATR x multiple x value per unit)

As a result, the position size is smaller in volatile markets and larger in calm markets, while the money at risk per trade stays roughly the same.

Illustrative Example

Suppose you have a $10,000 account and you are willing to risk 1% ($100) on a trade in a share CFD trading at $150. The 14-day ATR is $3.

• You choose a 2x ATR stop, so the stop distance is 2 x $3 = $6.
• For a long trade at $150, the stop goes at $144.
• Each share CFD moves $1 in value per $1 change in price, so position size = $100 / $6 = about 16 shares.
• If the stop is hit, the loss is about 16 x $6 = $96, close to your $100 limit, before spreads, overnight fees, or slippage.

Now imagine volatility doubles and ATR rises to $6. The same rules give a $12 stop distance and a position of about 8 shares. Your risk stays near $100, but your size halves automatically. That is the main benefit of using ATR this way,, but remember stops aren't guaranteed. In fast or gapping markets, a stop can be filled at a worse price than planned.

Popular ATR Settings

The default setting usually is 14 periods, and shorter periods typically react faster and produce more signals, while longer periods are smoother and slower. There is no single "best" setting, but these are common approaches:

• Day traders often apply ATR 14 to intraday charts, such as 5-minute or 15-minute bars, or use the daily ATR to estimate how far a market might travel in a session.
• Swing traders usually stick with ATR 14 on daily charts.
• Longer-term traders may use 20 or more periods, or weekly charts, to filter out short bursts of volatility.

Whatever you choose, align your chart timeframe with your ATR, and test the settings on a demo account before committing any capital.

Limitations of the ATR

• It does not predict direction. A high ATR says nothing about whether the next move is up or down.
• It is a retrospective indicator and is based on past bars. A surprise news event, such as a central bank decision or a jobs report, can produce moves far larger than recent ATR suggests.
• It is not comparable across instruments in raw form, because it is measured in price units.

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