Volatility

Bollinger Band Width Calculator

Enter your simple moving average, standard deviation, and multiplier (usually 20-period SMA, 2 standard deviations) to get the upper band, lower band, and the normalized %B bandwidth reading traders watch for volatility squeezes and expansions.

SMA (centerline)

Standard Deviation

Multiplier

Upper band···

Centerline (SMA)···

Lower band···

Band width (price units)···

Bandwidth (% of SMA)···

Educational tool only, not financial advice. Bollinger Bands describe recent volatility, not a guarantee of where price will trade. Check it against your own plan and risk rules before you trade it.

Built by Jason Parker, founder of Trading Ranges.