The average true range is a technical indicator that tells you a market’s current volatility – making it a key part of many successful strategies. Learn how to use the ATR indicator in your trading here. The average true range (ATR) is a measure of how much a market might move in any given session, calculated by averaging movement over a set timeframe. This is usually 14 periods, although you can adjust it to be longer or shorter according to your strategy. The ATR indicator was invented by J. Welles Wilder, a noted commodities technical analyst who also created the average directional index (ADX) and the relative ... (full story)