Free ATR Stop-Loss and Position Size Calculator
Volatility-adjusted stop-losses keep your dollar risk constant across instruments with very different price behavior. Enter the asset's ATR, your preferred ATR multiple, and account details — the calculator returns the stop price and the matching position size.
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How to use this calculator
ATR (Average True Range) measures the average move per candle. Using a multiple of ATR for stops makes risk consistent across regimes:
- 1× ATR stop — tight, frequent stop-outs. Good for scalping.
- 2× ATR stop — standard for swing trades.
- 3× ATR stop — wider, holds through normal noise. Used in trend-following.
Stop distance = ATR × Multiple. The calculator places the stop that many price units below entry (for longs) and computes how many shares you can buy so that hitting the stop costs your defined risk amount.
Use case: Same trader, same 1% risk, different volatility. AAPL's ATR is $4, so a 2× stop is $8 below entry. AMC's ATR is $0.20, so a 2× stop is $0.40 below entry. Position sizes auto-adjust — risk-per-trade stays the same.