ATR (Average True Range) is the average candle range over the last N bars — the market's current stride length. Every distance in trading should be measured in it: a 50-point stop is tight when ATR is 80 and absurd when ATR is 15. Fixed-point thinking is why the same trader wins in one regime and bleeds in the next.
Using ATR like a professional
- Stops: place them beyond structure PLUS a volatility buffer (e.g., 0.5–1 ATR) so ordinary noise can't tag you out of a correct idea.
- Position size: risk a fixed % of account per trade (see Sizing lesson), then let the ATR-based stop distance dictate the size. Wider stop → smaller size, automatically.
- Regime check: ATR doubling means every distance halves in time terms — targets arrive faster, and so do stops. Re-plan, don't autopilot.
One formula to keep: size = (account × risk%) ÷ stop distance. ATR sets the stop distance honestly; the formula keeps every trade's damage identical regardless of volatility.