Developed by Tushar Chande, the Aroon Oscillator is based upon his Aroon Indicator. Much like the Aroon Indicator, the Aroon Oscillator measures the strength of a trend.

The Aroon Oscillator is constructed by subtracting Aroon Down from Aroon Up. Since Aroon Up and Aroon Down oscillate between 0 and +100, the Aroon Oscillator oscillates between -100 and +100 with zero as the center crossover line. The Aroon Oscillator signals an uptrend if it is moving towards its upper limit. It signals a downtrend when it is moving towards the lower limit. The closer the Aroon Oscillator value is to either extreme the stronger the trend.