TL;DR
ATR (Average True Range) measures how much a market typically moves per bar by averaging the true range — the largest of high-to-low, high-to-previous-close, or low-to-previous-close — giving traders a volatility-calibrated ruler for stops, targets, and position sizing.
What Is ATR?
Average True Range (ATR) is a technical indicator developed by J. Welles Wilder Jr. (the same creator as RSI), measuring market volatility by calculating the average of a series of “true ranges.” The true range on any given bar is the largest of three values: the current high minus the current low, the absolute difference between the current high and previous close, and the absolute difference between the current low and previous close. This three-way comparison ensures that overnight gaps and limit moves are captured in the volatility measurement.
ATR’s value lies in its market-agnostic nature. A $5 stock and a $500 stock have ATR values that are directly comparable as a percentage of price — this allows traders to apply consistent risk rules across assets with different price levels. An ATR of 2.0 on a $100 stock means the market typically moves $2 per day; placing a stop at 2× ATR means placing it $4 away — beyond the typical daily noise.
ATR is not a directional indicator. It tells you nothing about whether price is going up or down — it only tells you how much it is moving. This is precisely what makes it valuable for risk management: ATR provides the volatility context needed to set stops that aren’t so tight they’re stopped out by random noise, and not so wide they absorb catastrophic losses when trades go wrong.
Key Formula / Numbers
True Range = max(High - Low, |High - Prev. Close|, |Low - Prev. Close|)
ATR(N) = Wilder's Moving Average of True Range over N periods
Standard period: 14
Wilder's smoothing: ATR(t) = (ATR(t-1) × (N-1) + TR(t)) / NATR-based stop loss distances:
| ATR Multiple | Use Case |
|---|---|
| 1.0× ATR | Very tight stop; high false positive rate on small moves |
| 1.5× ATR | Tight stop; works in low-volatility assets |
| 2.0× ATR | Standard; most commonly recommended |
| 3.0× ATR | Wide stop; trend-following, gives room for pullbacks |
How Quantzee Uses This
ATR is the foundational volatility input in Quantzee’s SuperTrend Fusion indicator. The indicator’s band distance — how far the Supertrend line sits from price — is calculated as a multiple of ATR, ensuring the band automatically widens in volatile markets and tightens in calm ones. This adaptive behavior prevents the fixed-distance problem that plagues non-ATR-based trend indicators: getting stopped out by normal volatility in high-vol regimes, or having stops too wide to be meaningful in low-vol periods. All ATR-based calculations in Quantzee indicators use non-repainting bar data, so the ATR value at any historical bar reflects what was calculable at that bar close.
Common Mistakes
- Using raw ATR values across different assets without normalizing: A Bitcoin ATR of 2,000 is very different from a EUR/USD ATR of 0.0080. Compare ATR as a percentage of price (ATR/Price × 100) when applying consistent rules across multiple markets.
- Not adjusting ATR period for timeframe: A 14-period ATR on a 1-minute chart captures 14 minutes of volatility; on a daily chart, it captures 14 days. The same period number means very different things across timeframes — recalibrate when changing timeframes.
- Treating ATR as a fixed stop distance: ATR changes daily. An ATR-based stop placed today should be recalculated based on current ATR, not the ATR from when you first entered the position. Many traders trail their stop dynamically as ATR evolves.
Related Terms
FAQ
What does ATR tell you?
ATR tells you how much a market is typically moving per bar — it is a pure volatility measurement with no directional bias, used primarily for sizing stops and positions relative to normal market movement.
What is a good ATR value?
There is no “good” ATR value in absolute terms — the useful number is ATR relative to price. An ATR of 1–2% of price per day indicates moderate volatility; above 3% per day is high volatility that requires wider stops and smaller position sizes.
How do you use ATR for stop loss?
The most common method is multiplying ATR by 1.5–2.0 and placing the stop that distance from entry — this ensures the stop is beyond the typical noise of the market rather than at an arbitrary fixed distance.