Average Directional Index (ADX)

ADXaverage directional indexDMIdirectional movement index

The Average Directional Index (ADX) measures the strength of a trend regardless of its direction, helping traders determine whether a market is trending or range-bound on a scale from 0 to 100.

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Analysis from Apr 19, 2026

What Is ADX?

The Average Directional Index (ADX) is a technical indicator developed by J. Welles Wilder Jr. that measures the strength of a trend without indicating its direction. The ADX line itself oscillates between 0 and 100, with higher values indicating stronger trends and lower values indicating weak or absent trends. It is typically used alongside the +DI and -DI lines, which together form the Directional Movement System.

ADX answers a question that most other indicators ignore: is the market trending at all? While momentum indicators like RSI and MACD can signal overbought/oversold conditions in both trending and ranging markets, ADX helps traders determine which type of market regime they are in, allowing them to choose the appropriate strategy.

How Traders Use ADX

The most fundamental use of ADX is as a trend filter. When ADX is above 25, the market is trending, and trend-following strategies (moving average crossovers, breakouts, channel rides) are appropriate. When ADX is below 20, the market is ranging, and oscillator-based strategies (buying oversold, selling overbought) tend to perform better.

The +DI and -DI crossover system generates directional signals. A buy signal occurs when +DI crosses above -DI, indicating that upward price movement is dominating. A sell signal occurs when -DI crosses above +DI. Traders often require ADX to be above 20 or 25 before acting on these crossovers to avoid signals in trendless markets.

ADX turns provide early warnings about trend changes. When ADX peaks and begins to decline, it signals that the current trend is losing steam, even though the trend may still be intact. When ADX bottoms and begins to rise from a low level (below 20), it warns that a new trend may be starting, though the direction is unknown until the +DI/-DI relationship confirms it.

ADX as a Strategy Selector

Sophisticated traders use ADX to dynamically switch between strategies. In high-ADX environments, they deploy trend-following systems. In low-ADX environments, they switch to mean-reversion systems. This adaptive approach recognizes that no single strategy works in all market conditions and uses ADX as the mechanism to determine which regime is currently active.

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Frequently Asked Questions

▶What ADX value indicates a strong trend?

An ADX value above 25 generally indicates a strong trend is in place, while a reading below 20 suggests a weak or non-existent trend (range-bound market). Readings above 40 indicate a very strong trend, and readings above 50 indicate an extremely powerful trend, which are relatively rare. The direction of the ADX line also matters: a rising ADX means the trend is strengthening, while a falling ADX means the trend is weakening, regardless of whether price is going up or down. ADX tells you how strong the trend is, not whether it is bullish or bearish.

▶How do you use ADX with +DI and -DI?

The ADX system includes two additional lines: +DI (positive directional indicator) and -DI (negative directional indicator). +DI measures upward movement strength and -DI measures downward movement strength. When +DI is above -DI, the trend is bullish. When -DI is above +DI, the trend is bearish. A classic signal occurs when +DI crosses above -DI while ADX is above 25, confirming a bullish trend with strength. Some traders only take crossover signals when ADX is rising and above the 20 threshold, filtering out signals in trendless markets.

▶Can ADX be used for mean reversion strategies?

Yes, low ADX readings are valuable for mean reversion traders. When ADX is below 20 and falling, the market is in a range-bound state where mean reversion strategies (buying at support, selling at resistance) tend to work well. Oscillators like RSI and stochastic produce more reliable signals in low-ADX environments. Conversely, when ADX is above 25 and rising, trend-following strategies are preferred and mean reversion can be dangerous. Using ADX as a regime filter to switch between trend-following and mean-reversion strategies is a sophisticated approach used by many systematic traders.

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