The Average Directional Index (ADX) measures how STRONG a trend is — not its direction. This makes it unique among indicators. While moving averages tell you the direction, ADX tells you whether it’s worth trading. A trend-following strategy in a weak trend generates losses. ADX helps you avoid that.
How ADX Works
ADX produces a value between 0 and 100:
- 0-20: No trend or very weak trend. Market is ranging. Avoid trend-following strategies.
- 20-40: Emerging or moderate trend. Trend-following strategies start working.
- 40-60: Strong trend. Best environment for trend following.
- 60-100: Extremely strong trend. Rare. Often seen during major market events.
ADX Components
- ADX line: Measures trend strength (not direction)
- +DI (Positive Directional Indicator): Measures upward movement
- -DI (Negative Directional Indicator): Measures downward movement
When +DI is above -DI and ADX is above 25 = strong uptrend. When -DI is above +DI and ADX is above 25 = strong downtrend.
How to Use ADX in Trading
Strategy Selection
- ADX below 20 → Use range trading strategy (RSI, Bollinger Bands)
- ADX above 25 → Use trend following strategy (moving averages, MACD)
- ADX rising → Trend is strengthening. Stay in trend trades longer.
- ADX falling → Trend is weakening. Tighten stops, reduce exposure.
DI Crossovers
- +DI crosses above -DI while ADX > 25 → Bullish signal
- -DI crosses above +DI while ADX > 25 → Bearish signal
- Ignore DI crossovers when ADX < 20 — no trend to trade
ADX + Other Indicators
ADX is best used as a filter, not a standalone signal:
- ADX > 25 → apply your trend-following strategy
- ADX < 20 → switch to range-trading mode
- This simple filter alone can dramatically improve any strategy’s win rate
Settings
- 14-period: Default. Good for swing trading.
- 7-period: More responsive. Better for day trading.
- 21-period: Smoother. Better for position trading.
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