The Bottom Line

The average true range is an indicator of the price volatility of an asset. It is best used to determine how much an investment’s price has been moving in the period being evaluated rather than an indication of a trend. Calculating an investment’s ATR is relatively straightforward, only requiring you to use price data for…

Limitations of the ATR

There are two main limitations to using the ATR indicator. The first is that ATR is a subjective measure, meaning that it is open to interpretation. No single ATR value will tell you with any certainty that a trend is about to reverse or not. Instead, ATR readings should always be compared against earlier readings to get…

What Does the ATR Tell You?

Wilder originally developed the ATR for commodities, although the indicator can also be used for stocks and indices.1 Simply put, a stock experiencing a high level of volatility has a higher ATR, and a lower ATR indicates lower volatility for the period evaluated. The ATR may be used by market technicians to enter and exit trades and is a…

The Average True Range (ATR) Formula

The formula to calculate ATR for an investment with a previous ATR calculation is : \begin{aligned}&\frac{ \text{Previous ATR} ( n – 1 ) + \text{TR} }{ n } \\&\textbf{where:} \\&n = \text{Number of periods} \\&\text{TR} = \text{True range} \\\end{aligned}​nPrevious ATR(n−1)+TR​where:n=Number of periodsTR=True range​ If there is not a previous ATR calculated, you must use: \begin{aligned}&\Big ( \frac{ 1 }{…

What Is the Average True Range (ATR)?

The average true range (ATR) is a technical analysis indicator introduced by market technician J. Welles Wilder Jr. in his book New Concepts in Technical Trading Systems that measures market volatility by decomposing the entire range of an asset price for that period.1 The true range indicator is taken as the greatest of the following: current high…