The Average Directional Index (ADX) measures the strength of a trend on a 0-100 scale — regardless of direction. A rising ADX means the trend (up or down) is strengthening; a low, flat ADX means the market is rangebound and directionless. It answers "is there a trend?" before you ask "which way?"
Reading the levels
Broadly: below 20-25 signals a weak or absent trend (choppy, mean-reverting); above 25 signals a trending market that's gaining strength; above 40-50 signals a very strong trend. The ADX line itself has no direction — it only tells you how much conviction is behind the current move.
The DI lines
ADX is usually paired with two directional indicators: +DI (upward pressure) and -DI (downward pressure). When +DI is above -DI, buyers dominate; when -DI leads, sellers do. The combination tells you both the strength (ADX) and the direction (which DI leads) of the move.
ADX doesn't say buy or sell. It says whether it's a day to trend-follow or a day to fade.
Why it's underrated
ADX's real value is regime detection. A momentum strategy works in high-ADX conditions and dies in low-ADX chop; a mean-reversion strategy is the reverse. Knowing which regime you're in — before you apply a strategy built for the other — is one of the quietest edges there is. That's a job systematic reads take seriously.
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NoVo is a software tool for market analysis, not financial advice. This article is general education, not investment advice. Options trading involves substantial risk of loss, up to and including your entire capital. NoVo makes no guarantee of profit, win rate, or performance, and past results do not predict future outcomes. You are responsible for your own broker account, configuration, and trading decisions.
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