Average True Range (ATR)

Average True Range helps you understand how widely an asset’s price has been moving. It measures volatility but does not tell you whether the price will rise or fall.

• ATR is generally calculated over 14 periods.
• A higher ATR indicates wider price movements and greater volatility.
• A lower ATR indicates smaller price movements and lower volatility.
• ATR considers the current high, current low, and previous closing price.
• Traders may use ATR when setting stop-loss levels and deciding position sizes.
• ATR is based on past prices, so it may react slowly to sudden market changes.
• In the example used below, the 14-day ATR is approximately ₹9.29.
   

The Average True Range is a technical indicator used to measure market volatility. It calculates the average range within which an asset’s price has moved over a selected number of periods.
ATR considers both price movements within a trading session and gaps from the previous closing price. This provides a broader view of volatility than simply subtracting the day’s low from its high.
For example, suppose a stock normally moves between ₹5 and ₹8 each day. Its ATR may remain within a similar range. If the stock suddenly begins moving by ₹15 or ₹20 each day, the ATR is likely to rise.
ATR does not predict the direction of the next price movement. A high ATR may occur during either a sharp rise or a sharp fall.
Traders may use ATR to understand market activity, assess trading risk, and set entry, exit, or stop-loss levels. However, it is generally used with other indicators because it does not provide a complete trading signal on its own.
 

ATR is calculated in two main stages.

1. Calculate the True Range

For each period, the True Range is the greatest of these three values:

• Current high minus current low
• Absolute value of current high minus previous close
• Absolute value of current low minus previous close

The word “absolute” means that the result is considered without a negative sign.

For example, suppose the current high is ₹110, the current low is ₹100, and the previous close is ₹96.

The three values would be:

• Current high minus current low: ₹110 − ₹100 = ₹10
• Current high minus previous close: ₹110 − ₹96 = ₹14
• Current low minus previous close: ₹100 − ₹96 = ₹4

The greatest value is ₹14. Therefore, the True Range for that period is ₹14.

2. Calculate the Average True Range

Once the True Range values are available, ATR can be calculated using their average. A period of 14 days is commonly used.

For the initial 14-period calculation:

ATR = Sum of the True Range values ÷ 14

Later ATR values are generally calculated using a smoothing method based on the previous ATR and the latest True Range.

The following simplified example shows the calculation for a stock over 14 days:

The total of the True Range values is:

₹10 + ₹10 + ₹9 + ₹9 + ₹8 + ₹10 + ₹10 + ₹9 + ₹10 + ₹10 + ₹10 + ₹9 + ₹8 + ₹8 = ₹130

Therefore:

ATR = ₹130 ÷ 14 = approximately ₹9.29

This means the stock moved by an average True Range of approximately ₹9.29 during the selected 14-day period.

This is a simplified example. Actual charting platforms may use a smoothing method when calculating later ATR values.

Suppose a stock has an ATR of ₹20. This means its price has recently moved by an average True Range of around ₹20 per trading session.
Assume a trader buys the stock at ₹1,000. Placing a stop-loss only ₹2 below the buying price may cause the position to close because of a normal daily price movement.
The trader may consider the ₹20 ATR while deciding how far the stop-loss should be from the entry price. A wider stop-loss may be considered when volatility is high, while a narrower stop-loss may be considered when volatility is low.
However, ATR does not specify the exact stop-loss or target a trader should use. The final level depends on the trading strategy, risk tolerance, and market conditions.
 

ATR tells you how much an asset’s price has been moving on average. It was developed by J. Welles Wilder for commodity markets but can also be applied to stocks and indices.

A higher ATR indicates that the asset has experienced wider price movements. This generally reflects higher volatility.

A lower ATR indicates smaller price movements. This generally reflects calmer or less volatile market conditions.

For example:

• If ATR rises from ₹5 to ₹12, the asset’s recent price movements have become wider.
• If ATR falls from ₹12 to ₹5, the asset’s recent price movements have become smaller.

ATR does not indicate whether the price is moving upwards or downwards. A stock falling sharply may have a high ATR, and a stock rising sharply may also have a high ATR.

Traders may use ATR to adjust stop-loss distances and position sizes. In a highly volatile market, they may take a smaller position to limit risk. In a less volatile market, they may use a different position size based on their trading plan.

ATR can help traders understand current volatility and manage trading risk.

1. Measuring volatility

ATR shows whether recent price movements have been wide or narrow.

A rising ATR indicates increasing volatility. A falling ATR indicates decreasing volatility.

For example, an ATR increase from ₹10 to ₹25 means the asset’s average price range has widened. It does not mean the price will necessarily rise.

2. Setting stop-loss levels

ATR can help traders place stop-loss orders according to recent price volatility.

In a highly volatile market, a stop-loss placed too close to the entry price may be triggered by an ordinary price movement. Traders may therefore consider a wider distance based on the ATR.

In a less volatile market, price movements may be smaller. A trader may use this information while deciding a suitable stop-loss distance.

3. Understanding the strength of price movements

Increasing ATR values may accompany strong price movements, while decreasing ATR values may appear when market activity is slowing.

However, ATR alone does not confirm whether a trend is strong or which direction it is moving. Traders generally examine the price trend and other indicators along with ATR.

4. Managing risk

ATR provides a numerical measure of recent market volatility. Traders may use this value when deciding how much capital to place in a trade.

For example, a trader may choose a smaller position when ATR is high because wider price movements can lead to larger gains or losses. The trader may consider a different position size when ATR is low.

ATR can be useful, but it also has certain limitations.

1. It does not show price direction

ATR measures the size of price movements, not their direction.

A high ATR does not mean that the price will rise. It only means that recent price movements have been wider.

Traders may combine ATR with indicators that help identify price direction or trends.

2. It is a lagging indicator

ATR is calculated using past price information. It may therefore react after market volatility has already changed.

For example, a sudden price gap may immediately increase the True Range. However, its effect on a 14-period ATR may appear gradually because the calculation also includes earlier periods.

3. It may not suit every strategy

ATR is mainly useful for strategies that consider volatility, stop-loss placement, and position sizing.

It may be less useful when used alone in range-based or mean-reversion strategies. In such cases, traders may need other indicators to understand support, resistance, or price direction

4. Results depend on the selected period

ATR values can change according to the period used in the calculation.

A shorter period reacts more quickly to recent price changes but may fluctuate frequently. A longer period produces a smoother reading but may respond more slowly.

For example, a 7-period ATR and a 14-period ATR can show different values for the same stock. Traders must choose a period that matches their trading time frame and strategy.

The Average True Range is a technical indicator that measures how much an asset’s price has moved on average over a selected period. A higher ATR reflects wider price movements, while a lower ATR reflects smaller movements.
ATR can help traders understand volatility, plan stop-loss levels, and manage position sizes. However, it does not predict price direction and is based on past data. Therefore, it should be used with other forms of technical and fundamental analysis rather than as an independent trading signal.