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ADX (Average Directional Index)

Also called: average directional index

A momentum indicator that measures the STRENGTH of a trend (not its direction) — readings above 25 mean a real trend is in play.

ADX is a single line that oscillates between 0 and 100. It measures how STRONG the current trend is, not which way it's going. Readings below 20 mean the market is choppy and trendless. Readings above 25 mean a real trend is in play. Above 40 and you're in a strong, sustained move. ADX is a filter, not a signal. You don't trade ADX directly — you use it to decide whether to take other signals. A breakout signal in a market with ADX 15 is probably going to fail (no trend energy). The same breakout in a market with ADX 35 has a much higher win rate. The two companion lines (+DI and -DI) tell you direction. +DI above -DI = bullish trend. -DI above +DI = bearish trend. Crossovers between the two are early trend-change signals.

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Real trade example

USD/JPY's run from 140 to 161 in 2024 saw daily ADX climb from 18 to 45 — the rising ADX confirmed the trend strength every step of the way and warned shorts not to fight it.

Frequently asked about adx (average directional index)

What is an adx (average directional index) in trading?+
A momentum indicator that measures the STRENGTH of a trend (not its direction) — readings above 25 mean a real trend is in play.
When will I see adx (average directional index) used in real trading?+
Below the price chart on most platforms. Default 14-period setting works for most timeframes.
What is the most common mistake traders make with adx (average directional index)?+
Treating high ADX as a sell signal ("the trend is overextended"). ADX measures STRENGTH — high ADX often means the trend has more room, not less.
What do experienced traders know about adx (average directional index) that beginners don't?+
Avoid taking trend-following trades when ADX is below 20. The market is in chop and your edge disappears. Wait for ADX to rise above 25 before committing.

Related terms

Moving Average

beginner

A smoothed line showing the average price over a recent period — the most-used indicator in technical analysis.

ATR (Average True Range)

intermediate

An indicator that measures average price volatility over a set period — used to size stops and position sizes.

Fibonacci Extension

intermediate

Fibonacci levels projected BEYOND the original swing (127.2%, 161.8%, 261.8%) — used to set price targets after breakouts.

Ichimoku Cloud

advanced

A multi-line trend indicator from Japan that visualizes support, resistance, momentum, and trend direction in a single chart overlay.

VWAP (Volume-Weighted Average Price)

advanced

An intraday indicator that shows the average price an asset has traded at, weighted by volume — used as a benchmark and dynamic support/resistance.

Keltner Channel

advanced

A volatility-based envelope around a moving average using ATR — similar to Bollinger Bands but smoother.

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