The ATR Formula is a technical analysis indicator used in Forex trading. The ATR stands for Average True Range and is used to measure market volatility. The ATR Formula looks at the True Range of a trading period and takes the average of the true range over a given number of periods. This provides traders with an indication of the average volatility of a currency pair during a given period. The ATR Formula is a useful tool for those looking to enter the Forex market and protect their capital from volatility.