Understanding market volatility is crucial for traders across all timeframes. Three widely used metrics—Average True Range (ATR), Average Day Range (ADR), and Intraday Range (IR)—help quantify price movement, offering insights into how much an asset typically moves over a given period. While they serve similar purposes, each has unique calculation methods and ideal use cases.
These tools are volatility indicators, not directional ones. They reveal the magnitude of price swings—up or down—but do not predict where price will go next. This distinction makes them especially valuable for risk management, trade planning, and strategy optimization.
What Is Average True Range (ATR)?
Developed by J. Welles Wilder, Average True Range (ATR) is one of the most popular volatility indicators in technical analysis. It measures the average price movement of an asset over a specified number of periods—typically 14, though this can be adjusted.
Unlike simple range calculations, ATR accounts for gaps between bars, making it particularly useful for swing traders and position holders who carry trades overnight.
How ATR Is Calculated
ATR is based on the True Range (TR), which takes the greatest of the following three values:
- Current high minus current low
- Absolute value of current high minus previous close
- Absolute value of current low minus previous close
This ensures that any gap from the prior close is included in the volatility measurement.
Once TR is calculated for each bar, an average is derived. Wilder originally used a smoothed moving average:
ATR = [(Prior ATR × 13) + Current TR] ÷ 14
Modern charting platforms allow variations such as simple or exponential moving averages. While the 14-period setting remains standard, traders may adjust it depending on their strategy’s sensitivity needs.
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Practical Use of ATR
On a daily chart, ATR shows average dollar movement per day; on a 1-minute chart, it reflects typical volatility within each minute. Because ATR is usually expressed in dollar terms, it’s intuitive for position sizing and stop-loss placement.
For example:
- Stock price: $100
- ATR (14): $2
- A 2× ATR stop loss = $4 below entry → Stop at $96
This method places stops beyond normal noise, reducing the chance of being stopped out by routine fluctuations.
What Is Average Day Range (ADR)?
Average Day Range (ADR) measures the average difference between daily high and low prices over a set number of days. Unlike ATR, it ignores gaps between sessions.
Calculation
Day Range (DR) = Daily High – Daily Low
ADR = Sum of last N DR values ÷ N
Commonly calculated using 14 or 20 days, ADR gives a clean view of intraday volatility without overnight jumps skewing the data.
Because ADR excludes gaps, it's less responsive to sudden after-hours news. However, this also makes it more stable and reflective of actual trading-session behavior.
While often displayed in dollars, some versions convert ADR to percentages for cross-asset comparison. Still, most platforms show only the averaged value, not individual daily ranges.
What Is Intraday Range (IR)?
Intraday Range (IR), particularly in percentage form (IR%), provides granular insight into short-term volatility. It calculates the range of each price bar relative to its open:
IR% = [(High – Low) × 100] ÷ Open
This percentage-based approach allows direct comparison across assets regardless of price level. Whether analyzing a $5 stock or a $500 stock, a 3% IR% means similar relative movement.
Key Features
- Expressed in percent or dollars (configurable)
- Does not include gaps
- Shows every bar’s range, not just an average
- Can be smoothed with a moving average to create Average Intraday Range (AIR%)
For instance:
- AIR% of 5% suggests consistent intraday movement
- Useful for screening volatile stocks ideal for day trading
Traders can apply IR% on any timeframe—daily, hourly, or minute-by-minute—making it highly adaptable.
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Comparing ATR, ADR, and IR
| Feature | ATR | ADR | IR |
|---|---|---|---|
| Unit | Usually $ | Usually $ (can be %) | % or $ |
| Includes Gaps | Yes | No | No |
| Averaged | Yes | Yes | Optional |
| Shows Per-Bar Movement | No | No | Yes |
While all three assess volatility, their differences matter:
- ATR includes gaps → best for swing trading
- ADR shows average daily movement → good for longer-term context
- IR reveals every bar’s volatility → ideal for day trading
One isn’t inherently superior. The choice depends on your trading style and what aspect of volatility you want to measure.
Using ATR for Swing Trading
ATR shines in swing trading, where positions are held overnight and gaps are part of the risk.
A common technique is setting a stop loss at a multiple of ATR:
- 1.5× to 3× ATR is typical
- Protects against normal noise while allowing room for price swings
For a long trade:
Stop Loss Level = Entry Price – (ATR × Multiplier)
For trailing stops:
Update stop as price rises:
New Stop = Current Price – (ATR × Multiplier)
This dynamic approach locks in gains while staying resilient to volatility.
Using IR% and AIR% for Day Trading
Day traders benefit most from IR% and AIR%, since they capture real-time intrabar movement without distortion from overnight gaps.
Why IR% Works for Day Traders
- Measures actual movement during market hours
- Percentage format enables fair comparison across stocks and forex pairs
- Reveals consistency: Is volatility steady or sporadic?
A stock with AIR% of 5% likely offers frequent intraday opportunities. Conversely, one with AIR% under 1% may lack momentum for active trading.
Use IR% to:
- Screen high-volatility stocks
- Confirm breakout potential
- Adjust position size based on current volatility
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Frequently Asked Questions (FAQ)
Q: Can ATR predict price direction?
A: No. ATR measures volatility only—it shows how much price moves, not whether it will go up or down.
Q: Should I use ATR or IR for forex day trading?
A: IR% is generally better for forex day trading because it avoids gaps and uses percentages, enabling consistent comparisons across currency pairs.
Q: How do I choose the right ATR multiplier for stop losses?
A: Start with 1.5× to 2× ATR. Adjust based on asset volatility and your risk tolerance. Test different levels in backtesting.
Q: Can I compare ADR and ATR directly?
A: Only if both are in the same unit (e.g., dollars). Note that ATR is usually higher due to gap inclusion.
Q: Why use percentage-based ranges like IR% instead of dollar amounts?
A: Percentages normalize volatility across different-priced assets, allowing apples-to-apples comparisons.
Q: Is a higher ATR always better?
A: Not necessarily. Higher ATR means higher volatility, which increases both opportunity and risk. Choose based on your strategy and risk profile.
Disclaimer: This article does not contain personal investment advice or recommendations to buy or sell any financial instruments. Trading involves significant risk and can result in substantial losses.