ATR
Key Takeaways
- 01.Measures historical volatility, not price direction.
- 02.Represents the average trading range (including gaps) over a set period.
- 03.Crucial tool for volatility-based position sizing and stop-loss placement.
- 04.Standard setting is 14 periods.
Why it matters
ATR does not tell you *which* direction to trade, but *how far* the asset is likely to move. Traders use ATR to set stop-losses (e.g. 2x ATR away from entry) to prevent being stopped out by normal market noise (whipsaws), and to size positions according to volatility.
When it matters
It is essential in risk management and automated trading systems to adjust orders dynamically based on current market regimes.
A single line in a sub-panel showing volatility rising during sharp sell-offs and falling during slow consolidations.
View the ATR value to calculate your position size and stop-loss spacing.
Common Mistakes
Confusing ATR with a directional indicator
Buying because ATR is rising is a mistake; a rising ATR simply means volatility is increasing, which happens during sharp downward panics as well as rapid breakouts.
📖 Real-World Example: Volatility-adjusted stop-loss
A trader entered a long position on a volatile tech stock at $100. The stock had an ATR of $4.00. To prevent being stopped out by minor daily swings, the trader set a trailing stop-loss at 2x ATR ($8.00) below entry at $92. The stock fluctuated to $95 before rising to $120, keeping the trader in the position.