ATR — Average True Range — is the most useful technical indicator that almost nobody trades from directly. It doesn’t give buy/sell signals. It does something more valuable: it normalizes your decisions for volatility.
If you understand only one indicator deeply, make it ATR.
What ATR measures
True Range for a single bar is the largest of:
- High − Low.
- |High − Previous Close|.
- |Low − Previous Close|.
ATR(14) is the 14-period average of True Range. It captures volatility including overnight gaps. A plain “High − Low” doesn’t.
A stock with ATR(14) = ₹3 has been moving ₹3 per bar on average. A stock with ATR = ₹15 has been moving five times as much. Same “1% stop” applied to both is two completely different risks.
The three uses
1. Stop-loss sizing
The single best use. Set stops in ATR units:
- Standard intraday stop: 1.0–1.5 × ATR(14) from entry.
- Tight (scalping): 0.5 × ATR.
- Wide (full trend): 2 × ATR.
This auto-tightens stops on calm stocks and loosens them on volatile ones. Same rule, two different instruments. See stop-loss strategies.
2. Position sizing
Position size derives from ATR-based stop distance:
Position size = (Account × Risk%) / (ATR multiplier × ATR)
Example: ₹2,00,000 account, 1% risk = ₹2,000. Stock ATR = ₹3, multiplier = 1.5 → stop distance = ₹4.5 → position = 444 shares.
Volatility doubles → stop distance doubles → position size halves. Risk stays constant.
3. Regime detection
ATR tells you what kind of day it is.
- ATR(14) on 5-min today > 20-day average ATR → trend / news day. Use trend-continuation setups.
- ATR(14) today < 20-day average → range / chop day. Use mean-reversion setups.
This single check tells you whether to use ORB and VWAP trend setups (trend regime) or Stochastic mean reversion and Bollinger reversion (range regime).
ATR settings
| Use case | Period | Timeframe |
|---|---|---|
| Standard intraday | 14 | 5-min |
| Scalping | 7 | 1-min |
| Bank Nifty futures | 14 | 5-min |
| Swing position | 14 | Daily |
| Regime detection | 14 today vs 20-day SMA(ATR) | 5-min |
ATR(14) is universal default. Resist tuning.
How ATR is not a signal
People sometimes try to trade ATR crossovers or thresholds directly. Don’t. ATR is a noun, not a verb — a measurement of volatility, not a directional view. Pair it with directional indicators (RSI, MACD, SuperTrend).
Indicator combinations using ATR
- SuperTrend uses ATR internally. Read SuperTrend guide.
- Chandelier Exit =
Highest high(22) − 3 × ATR(22). Best trailing stop for trend days. See stop-loss strategies. - Keltner Channels =
EMA(20) ± 2 × ATR(10). Cleaner than Bollinger for trend-riding. - ATR-normalized R-multiples — express every trade outcome in “how many ATRs did this make / lose” for cross-stock comparison.
Worked example
Reliance, 5-min, 9:35 IST.
- ATR(14) = ₹3.20
- VWAP rejection setup; entry at ₹2,520.
- Standard stop = 1.5 × ATR = ₹4.80 → stop at ₹2,515.
- ₹2,00,000 account, 1% risk = ₹2,000.
- Position size = ₹2,000 / ₹4.80 = 416 shares.
- Target = 2R = ₹2,520 + 2 × ₹4.80 = ₹2,529.60.
Apply the same rule to HDFC Bank (ATR = ₹15.00): - Stop distance = ₹22.50, position = 88 shares. Risk still ₹1,980.
The math normalizes; the decision becomes mechanical.
ATR for entry sizing on F&O
F&O lot sizes are fixed. ATR helps you decide:
- Whether to take the trade — if ATR-based stop distance × lot size = more than your max risk, skip the trade. This is the single most undertaught rule in Indian F&O.
- Example: Bank Nifty ATR(14) on 5-min = 80 points. Lot = 15. 1.5 × ATR stop = ₹1,800. Max risk per trade ₹1,500 → don’t take it.
Common mistakes
- Treating ATR as a direction signal. It isn’t.
- Using too-short ATR (3, 5). Noise dominates; sizing whipsaws.
- Mixing ATR from different timeframes carelessly. Daily ATR for a 5-min stop is wrong.
- Forgetting overnight gap impact. ATR captures gaps; HL alone doesn’t. Use ATR.
A clean ATR-driven workflow
Every trade:
- Read ATR(14) on the current timeframe.
- Compute stop distance = 1.0–1.5 × ATR.
- Compute position size by risk budget.
- Check regime: today’s ATR vs 20-day avg → pick trend or range playbook.
- Place the trade with the SL-M order at the ATR-derived stop.
This is the disciplined skeleton. Indicators give signals; ATR gives sanity.
FAQs
Is ATR the same as standard deviation? No. Standard deviation is dispersion of returns; ATR is average bar range. Related, not equal.
Best ATR period for Indian stocks? 14 is the default. 10 for faster reaction. 21 for less whipsaw.
Why isn’t ATR more popular among retail? Because it doesn’t print “BUY” arrows. People want signals; they need measurement.
For the wider intraday foundation, see intraday trading in India: a beginner’s guide.