Monthly Range Projection Calculator

Enter your daily ATR and current price to project an expected monthly trading range. The projection uses square-root-of-time volatility scaling (monthly range ≈ daily ATR × √21, for roughly 21 trading days in a month), the same math used to scale daily volatility into longer horizons.

Educational tool only, not financial advice. Square-root-of-time scaling assumes volatility behaves like a random walk and is an approximation, not a guarantee of the month's actual range. Always confirm with your own strategy and risk management rules.

Built by Jason Parker, founder of Trading Ranges.