Bollinger Bands
By Menno — 13 years in crypto, 3 bear markets survived, zero paid promotions
Last updated: March 2026
Bollinger Bands are a volatility indicator consisting of a 20-period moving average with two bands plotted 2 standard deviations above and below, expanding in high volatility and contracting in low volatility.
Bollinger Bands, developed by John Bollinger in the 1980s, consist of three lines: the middle band (a 20-period simple moving average), the upper band (middle band + 2 standard deviations), and the lower band (middle band - 2 standard deviations). Approximately 95% of price action falls within the bands during normal market conditions, making excursions beyond the bands statistically significant.
Two primary uses in crypto: volatility analysis and price extremes. "Bollinger Band squeeze" occurs when the bands contract significantly, indicating a period of low volatility that historically precedes a major breakout. These squeezes on the weekly Bitcoin chart have preceded several major moves — both up and down. When price touches the upper band without breaking it, it suggests the asset is relatively expensive; touching the lower band suggests it's relatively cheap, within the context of the current trend.
The "Bollinger Band bounce" strategy involves buying when price touches or exceeds the lower band and selling when it reaches the upper band. This mean-reversion approach works reasonably well in ranging (sideways) markets but fails in trending markets where price can "walk the band" — staying near the upper band for extended periods during strong uptrends. In crypto bull markets, Bitcoin has been known to walk the upper Bollinger Band for weeks. This is why Bollinger Bands are most powerful when combined with trend-confirming indicators like the 200 EMA and MACD rather than used in isolation.
Frequently Asked Questions
What does it mean when Bitcoin touches the lower Bollinger Band?
Price touching or going below the lower Bollinger Band means it's statistically 2 standard deviations below the 20-period average — a relatively rare extreme. In a bull market trend, this often represents an oversold condition and potential buying opportunity. In a bear trend, it can represent continued weakness. Always confirm with trend direction before treating it as a buy signal.
What is a Bollinger Band squeeze?
A squeeze occurs when the upper and lower bands contract toward the middle, indicating very low volatility. Historically, periods of extremely low volatility in Bitcoin have preceded explosive moves. The direction of the breakout from a squeeze is not predetermined by the bands themselves — additional analysis is needed to anticipate the direction.
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Related Terms
MACD (Moving Average Convergence Divergence)
MACD is a momentum indicator that measures the relationship between two exponential moving averages to identify trend direction, momentum changes, and potential buy/sell signals.
RSI (Relative Strength Index)
RSI is a momentum indicator measured from 0 to 100 that shows whether an asset is overbought (above 70) or oversold (below 30), helping traders identify potential reversal points.
Volatility
Volatility measures how much an asset's price fluctuates over time. Crypto is significantly more volatile than traditional assets, meaning larger potential gains but also larger potential losses.
Support and Resistance
Support is a price level where buying pressure historically exceeds selling pressure, causing price to bounce. Resistance is a level where selling pressure exceeds buying, causing price to stall or reverse.
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