ADX Explained: Is the Trend Strong Enough to Trade?

Most indicators tell you which direction the market is moving. ADX tells you something even more important: whether it's even worth trading at all.

What Is ADX?

ADX stands for Average Directional Index. Developed by J. Welles Wilder (the same person who invented RSI and ATR), it measures trend strength on a scale of 0 to 100.

Critically, ADX does not tell you direction. It only tells you strength. It's always paired with two directional indicators:

• +DI — Positive Directional Indicator (bullish pressure)
• -DI — Negative Directional Indicator (bearish pressure)

Reading ADX Values

ADX Value	Trend Strength
0–20	No trend / choppy
20–25	Emerging trend
25–50	Strong trend
50–75	Very strong trend
75–100	Extreme trend (rare)

A common rule: only take directional trades when ADX > 25.

The +DI / -DI Crossover

When +DI crosses above -DI while ADX > 25 = Strong bullish signal. When -DI crosses above +DI while ADX > 25 = Strong bearish signal.

When ADX is below 20, both crossovers are unreliable noise.

Why This Matters for AI Signals

DeepPair's AI uses ADX as a filter layer. When ADX indicates no clear trend, the AI is more likely to output a NEUTRAL signal rather than forcing a LONG or SHORT call into a choppy ranging environment.

This prevents one of the most common beginner mistakes: trying to trade trends that don't exist yet.