Most trend indicators ask how far a price has moved. The Aroon indicator asks a different question: how long has it been since the last high or low? That simple idea helps traders judge whether a trend is strong, fading or about to begin. The name comes from Sanskrit and means something like the light of dawn, a nod to its aim of spotting the start of new trends.
What the Aroon indicator is
The Aroon indicator was developed by Tushar Chande in 1995. It has two lines, Aroon Up and Aroon Down, both plotted between zero and 100. A common setting looks back over 25 periods, although traders adjust this to suit their timeframe.
Aroon Up measures how recently the price made its highest high over the lookback period. If the highest high happened in the latest period, Aroon Up reads 100. If it happened at the very start of the period, it reads close to zero. Aroon Down does the same for the lowest low.
How to read it
When Aroon Up is high, near 70 to 100, and Aroon Down is low, the market has been making new highs recently and not new lows. That suggests an uptrend. The reverse suggests a downtrend. When both lines are low, neither new highs nor new lows are being made, which points to a sideways or consolidating market.
Crossovers are the most watched signals. When Aroon Up crosses above Aroon Down, it can signal that a new uptrend is starting. When Aroon Down crosses above Aroon Up, it can signal a new downtrend. Many platforms also show an Aroon Oscillator, which is simply Aroon Up minus Aroon Down, ranging from minus 100 to plus 100.
Why traders use it
The Aroon indicator is good at highlighting when a market is trending and when it is not. That matters because many strategies work well in one environment and badly in the other. Trend-following systems tend to struggle in sideways markets, while range-trading systems struggle in strong trends. Aroon can help a trader decide which approach suits current conditions.
It can also help confirm signals from other tools. For example, a breakout above resistance carries more weight if Aroon Up is rising strongly at the same time. Our guide to support and resistance covers how those levels are identified.
Weaknesses
Aroon only measures timing, not size. A tiny new high counts the same as a powerful breakout. That means it can give strong-looking readings during weak, choppy moves. Crossovers can also produce false signals in volatile markets, with the lines whipping back and forth. And like most indicators built on past prices, it reacts after the move has started.
Practical tips
Use Aroon alongside price action and at least one other tool, such as moving averages or volume, rather than on its own. Test different lookback periods on historical data for the markets you trade. Pay attention to the context: a crossover in the direction of the longer-term trend is usually more reliable than one against it. Always have a stop-loss plan, because no indicator is right every time.
The beginner takeaway
The Aroon indicator is a clean way to see whether a market is trending and how fresh that trend is. Treat it as one piece of evidence, not a trading system in itself. If you want to see how well you combine indicators and risk management, take the free Samuel & Co Trading Trader Assessment.
