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ADX vs ATR: is it trending, and how far does it move?

ADX and ATR were both created by the same man, and people mix them up all the time. One tells you if a trend is strong. The other tells you how far price usually travels.

Comparison · 6-minute read · Updated 2026-10-21

The short answer

The ADX (Average Directional Index) measures how strong a trend is, on a 0 to 100 scale. It does not say up or down. A strong downtrend and a strong uptrend can both show a high ADX.

The ATR (Average True Range) measures how far price usually moves in one bar, in price units. On a stock it might read $2.10. On EUR/USD it might read 0.0060.

ADX answers "is it trending?" ATR answers "how much room does it need?"

Side by side

How ATR works, with numbers

Each bar has a "true range": the biggest of these three:

• high minus low,
• high minus the last close,
• last close minus low.

The extra two catch gaps. If a stock closed at $50 and opened at $53, that $3 jump counts.

ATR averages the true range over 14 bars. Say a stock's ATR is $2.00. Some traders set a stop 1.5 ATR away: $3.00.

If you plan to risk $100 on the trade, that's $100 ÷ $3.00 = 33 shares. A math example, not a promise. The position size calculator does this for you.

How ADX works, in plain words

ADX compares how much each bar pushes past the bar before. Up pushes feed a line called +DI. Down pushes feed -DI. ADX smooths the gap between them.

• ADX rising: one side is pushing harder and harder.
• ADX falling: the push is fading, often into a sideways market.
• +DI above -DI: the up side has the edge. The reverse for down.

ADX: strengths and limits

The good parts:

• Tells you what kind of market you're in. Trend tools tend to struggle in ranges, and range tools in trends.
• Works on any market. It's a 0–100 scale, so readings compare well.

The limits:

• Slow. It's smoothed twice, so it confirms a trend after it's well under way.
• No direction on its own. You need +DI/-DI or the chart itself.

ATR: strengths and limits

The good parts:

• Gives your stop a reason. A stop tighter than one normal bar is often hit by noise.
• Helps sizing. Wider ATR means a wider stop, which means a smaller size for the same risk.

The limits:

• No direction, no strength. A high ATR can come with a strong trend or with wild chop.
• Changes with time of day and news. ATR jumps around rate decisions and big reports.

Which fits you?

1. You keep getting stopped out by normal wiggles: look at ATR. Compare your stop to one ATR. See how to set a stop loss.
2. You can't tell if the market is trending or ranging: ADX can help, along with higher highs and higher lows on the chart. See how to identify a trend.
3. You want one tool only: start with ATR. Risk is the part of a trade you control, and ATR feeds it directly.

Common mistakes

• Reading high ADX as "price will go up". ADX can be high in a falling market.
• Using ATR as a stop on its own. A stop belongs beyond a level on the chart. ATR checks if that distance is sensible.
• Comparing ATR across markets. $2 ATR on a $40 stock and on a $400 stock are very different moves.
• Keeping the same size when ATR doubles. A wider stop with the same size doubles the risk. Recalculate every time.

Questions