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Updated: 2026-03-08

ATR Trading Strategy: How to Use Average True Range for Position Sizing and Stops

J. Welles Wilder introduced Average True Range in his 1978 book New Concepts in Technical Trading Systems. Wilder designed ATR to solve a specific problem: standard price ranges ignore overnight gaps and limit moves, understating the true volatility a trader faces. By measuring the greatest of three values — current high minus low, current high minus prior close, current low minus prior close — ATR captures the full range a trader was exposed to, including opens that gap outside the prior session. A 2014 analysis of stop placement methods by Van Tharp Institute researchers found that ATR-based stops outperformed fixed dollar and percentage stops on risk-adjusted return metrics across futures, equities, and forex markets. The reason: volatility is not constant. A fixed $0.50 stop on a stock trading at 2 ATR per day is too tight; the same stop on a stock trading at 0.3 ATR is far too loose. ATR makes stops and sizes proportional to actual market conditions rather than arbitrary thresholds.

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ATR Trading Strategy: How to Use Average True Range for Position Sizing and Stops

What ATR Actually Measures

ATR is a 14-period smoothed moving average of True Range. True Range for each bar is the largest of:

1. Current high minus current low 2. Absolute value of current high minus prior close 3. Absolute value of current low minus prior close

The result is a single number in price units: if ATR on a stock is $2.40, the average true range over the past 14 bars is $2.40. If ATR on a futures contract is 12 ticks, the average daily range is 12 ticks.

ATR does NOT indicate direction. It measures magnitude of movement — how much the price has been moving, not which way. A rising ATR means volatility is increasing; a falling ATR means volatility is contracting.

Two practical readings from ATR:

**Absolute ATR**: The dollar/tick value — useful for stop placement and position sizing. **ATR%**: ATR divided by closing price × 100 — useful for comparing volatility across different instruments with different price levels. A $200 stock at $3 ATR is at 1.5% ATR; a $20 stock at $0.50 ATR is also at 2.5% ATR. These require different sizing decisions.

  • •ATR = 14-period smoothed average of True Range (high-low gap, or gap from prior close)
  • •Measures volatility magnitude, not direction
  • •Rising ATR = expanding volatility; falling ATR = contracting (consolidating)
  • •Absolute ATR used for stops/sizing; ATR% used for cross-market comparison
  • •Default period: 14 — Wilder's original. Shorter = more reactive; longer = smoother

ATR-Based Stop Placement

The most common ATR stop method is the Chandelier Stop: set the stop at a multiple of ATR below the highest close since entry (for longs) or above the lowest close since entry (for shorts).

**Chandelier Stop formula (long)**: Stop = Highest Close Since Entry − (ATR multiplier × ATR)

Common ATR multipliers by trading style: - Day trading (tight): 1.0–1.5 × ATR below entry candle low - Swing trading (standard): 2.0–2.5 × ATR below entry candle low - Position trading (wide): 3.0–4.0 × ATR below swing low

Why ATR stops work better than fixed stops: if you always use a $0.50 stop, your stop gets hit more often during high-volatility periods (ATR = $1.20) and less often during low-volatility periods (ATR = $0.40). ATR normalizes the stop to market conditions — your stop is at a position the market typically reaches on random noise when your thesis is wrong, not before.

A practical day trading rule: use 1.5 × ATR(14) on the 5-minute chart as your initial stop from your entry candle's extreme. This typically keeps stops outside the noise range while remaining tight enough for reasonable R ratios.

  • •Chandelier Stop: highest close since entry minus ATR multiplier × ATR
  • •Day trading: 1.0–1.5× ATR stop; swing trading: 2.0–2.5×; position: 3.0–4.0×
  • •ATR stops adjust automatically when volatility expands or contracts
  • •Fixed stops over-tighten in high-volatility and over-widen in low-volatility
  • •Always record ATR at entry — lets you audit whether your stop placement was calibrated

Position Sizing With ATR

ATR-based position sizing keeps your dollar risk constant per trade regardless of the instrument's volatility profile. The formula:

**Position Size = Dollar Risk Per Trade ÷ (ATR × ATR Multiplier)**

Example: You risk $200 per trade, using a 2× ATR stop. ATR on the stock is $3.50. Stop width = 2 × $3.50 = $7.00 Position size = $200 ÷ $7.00 = 28 shares

If ATR on a different stock is $1.20, same $200 risk at 2× ATR: Stop width = 2 × $1.20 = $2.40 Position size = $200 ÷ $2.40 = 83 shares

This is the fundamental advantage: you're trading more shares when the stock is less volatile and fewer when it's more volatile, while holding dollar risk constant. Without ATR-based sizing, traders unconsciously take larger dollar risks on volatile stocks (too wide stops) or get stopped out repeatedly on them (too tight).

For futures traders: use ATR in ticks × tick value to get the dollar equivalent. For forex: ATR in pips × pip value per lot.

Rule of thumb: on a standard swing trade, your ATR-based position size should consume no more than 2–4% of account equity. If the position size formula gives you a number that would exceed that exposure, the trade's volatility is too high for your account size.

  • •Position size = dollar risk ÷ (ATR × multiplier)
  • •Keeps dollar risk constant regardless of how volatile each instrument is
  • •More shares in low-volatility; fewer shares in high-volatility
  • •For futures: ATR in ticks × tick value = dollar ATR
  • •Check that resulting position doesn't exceed 2–4% of account

See How Your ATR-Based Stops Actually Perform

Tiltless captures ATR at entry and lets you filter your win rate by volatility regime — so you can see whether your stop placement is calibrated to market conditions or costing you edge.

Start Tracking With ATR — Free

ATR as a Volatility Filter for Entry

Beyond stops and sizing, ATR helps you avoid trading into dead conditions. Low ATR environments — when ATR has compressed to its lowest reading in 20+ bars — often precede range-bound chop where breakout setups fail repeatedly.

Two ATR-based entry filters:

**Minimum ATR filter**: Only enter breakout trades when ATR is at least X% of its 20-bar high. If ATR is currently 50% of its recent high, volatility is compressing and breakout patterns may resolve into continuation of low-volatility chop. Many traders require ATR to be at minimum 70% of its 20-bar high before entering trend-following breakouts.

**ATR expansion entry**: Enter trades only when the current day's true range has already exceeded a threshold (0.75 × ATR, for example), confirming the market is actually moving. This avoids entering during the dead zone of a session before any meaningful range develops.

For day traders: comparing current 5-minute ATR to the prior week's average 5-minute ATR tells you whether today is a high-volatility or low-volatility session. High-volatility sessions suit momentum and breakout strategies; low-volatility sessions suit mean-reversion and scalping approaches.

Journaling ATR at entry exposes this pattern quickly: calculate your win rate segmented by whether ATR was above or below average. Most traders find their strategy works in one regime but not the other.

How to Journal ATR in Your Trades

Logging ATR at entry unlocks retrospective analysis that's nearly impossible without it. For each trade, record:

- **ATR at entry**: The 14-period ATR on your primary timeframe - **ATR multiplier used**: 1.5×, 2×, 2.5×, etc. - **Stop width in ATR**: Actual stop distance divided by ATR (should match your multiplier if placed correctly) - **ATR regime**: Was ATR expanding, flat, or contracting at entry? - **ATR% at entry**: ATR divided by price — useful for cross-stock comparison

After 50+ trades, filter your journal by ATR regime at entry. You'll typically see that your setups perform significantly better in expanding volatility environments if you're a momentum trader, or in contracting environments if you're a mean-reversion trader. This is among the highest-value analytics a trader can run.

Tiltless captures ATR automatically on imported trades and lets you filter performance by volatility regime — so you can see your P&L curve in high-ATR vs. low-ATR environments without manual spreadsheet work.

Related Resources

Position Sizing Guide

Trading Risk Management Rules

How to Recover From a Trading Drawdown

Breakout Trading Strategy

FAQ

?What is a good ATR value for day trading?

There is no universal 'good' ATR — it depends on the instrument and your strategy. The question to ask is: is today's ATR above or below its recent average? For stocks, many day traders prefer ATR(14) on the daily chart to be at least $0.50 for liquid mid-caps, or at least 1.5% of price. On the intraday level, compare the 5-minute ATR to its prior week average to gauge whether the session is high or low volatility.

?What ATR multiplier should I use for stops?

The most common starting points: 1.5× ATR for day trades, 2× ATR for swing trades, 3× ATR for position trades. These are starting points — backtest your specific strategy to find the multiplier that gives the best balance of letting trades breathe without absorbing excessive losses. Wilder's original Parabolic SAR used a 3-ATR equivalent stop for trend-following.

?How does ATR differ from standard deviation?

ATR measures range (high-to-low movement including gaps) while standard deviation measures deviation from a mean price level. ATR is more practical for stop placement because it reflects the actual price path a trader experiences. Standard deviation is more theoretically grounded but can understate risk during gap events. For trading purposes, ATR is the more operationally useful measure.

?Should I use ATR on every trade?

ATR is especially critical for position sizing and stop placement — using it on every trade makes your risk management consistent. For entry filters, you may not always need it, but logging ATR at every entry costs nothing and enables powerful retrospective analysis. After 100 trades with ATR logged, you can see which volatility regimes your strategy performs in — that insight alone is worth the bookkeeping.

See How Your ATR-Based Stops Actually Perform

Tiltless captures ATR at entry and lets you filter your win rate by volatility regime — so you can see whether your stop placement is calibrated to market conditions or costing you edge.

Start Tracking With ATR — Free
ATR Trading Strategy: Position Sizing, Stop Placement, and Volatility-Based Entries