Bollinger Bands

Bollinger BandsBBbollinger band

Bollinger Bands are a volatility indicator consisting of a middle moving average band with two outer bands set at standard deviations above and below, helping traders identify overbought and oversold conditions.

Current Macro RegimeSTAGFLATION→ STABLE

The macro regime is STAGFLATION STABLE — growth decelerating (GDPNow 1.3%, consumer sentiment 56.6, housing deeply contractionary) while inflation is sticky-to-rising (Cleveland Fed CPI Nowcast 5.28%, PCE Nowcast 4.58%, GSCPI elevated). The bear steepening yield curve (30Y +10bp, 10Y +7bp 1M) with r…

Analysis from Apr 18, 2026

What Are Bollinger Bands?

Bollinger Bands are a volatility-based technical indicator developed by John Bollinger in the 1980s. The indicator plots three lines on a price chart: a middle band (typically a 20-period SMA), an upper band (middle band plus two standard deviations), and a lower band (middle band minus two standard deviations). Because standard deviation measures volatility, the bands expand during volatile periods and contract during quiet ones.

The default settings of a 20-period SMA with 2 standard deviations are designed so that roughly 95% of price action occurs within the bands. When price moves to the upper band, it is relatively high; when it touches the lower band, it is relatively low. These are statements about relative positioning, not trading signals by themselves.

How Traders Use Bollinger Bands

The Bollinger Band squeeze is one of the most popular setups. When the bands narrow to their tightest point in a given lookback period, volatility has compressed and a significant move is often imminent. Traders prepare for a breakout in either direction and enter when price and volume confirm the breakout side.

Band walks occur when price repeatedly touches or closes beyond one of the outer bands during a strong trend. Rather than signaling a reversal, this indicates sustained momentum. Attempting to fade a band walk, or trade against it, is a common mistake among beginning traders.

Mean reversion strategies use Bollinger Bands in range-bound markets. When price touches the upper band and momentum wanes, short-term traders may sell. When price touches the lower band and shows signs of stabilizing, they may buy. These strategies work best when the bands are relatively flat, indicating a sideways market.

Key Settings and Variations

While 20-period, 2 standard deviation settings are standard, traders adjust these for different purposes. A tighter band (1.5 standard deviations) captures roughly 86% of price data and generates more frequent signals. A wider band (2.5 standard deviations) reduces signals but makes each one more significant.

Some traders use Bollinger BandWidth (the percentage distance between bands) as a standalone indicator to quantify volatility cycles. Others use %B, which measures where price falls within the bands on a 0-to-1 scale, to build systematic mean-reversion strategies.

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Frequently Asked Questions

▶How do Bollinger Bands work?

Bollinger Bands consist of three lines: a 20-period simple moving average in the center, an upper band set two standard deviations above the SMA, and a lower band set two standard deviations below. The bands automatically widen when volatility increases and contract when volatility decreases. Approximately 95% of price action falls within the two standard deviation bands. Traders use the bands to identify when price is relatively high or low compared to recent history, detect volatility shifts, and spot potential reversal points.

▶What does a Bollinger Band squeeze indicate?

A Bollinger Band squeeze occurs when the bands narrow to an unusually tight range, indicating that volatility has compressed significantly. This is often a precursor to a sharp price move in either direction. The squeeze reflects a period of consolidation where buying and selling pressure are roughly balanced. When the bands begin to expand again and price breaks out of the tight range, it often initiates a new trend. Traders watch for squeezes as setup conditions, then use the direction of the breakout to determine whether to go long or short.

▶Should you buy when price touches the lower Bollinger Band?

Touching the lower Bollinger Band does not automatically mean you should buy. In strong downtrends, price can "walk the band," repeatedly touching or even closing outside the lower band. Buying in that scenario would mean catching a falling knife. Lower band touches work best as buy signals in range-bound markets where price oscillates between the upper and lower bands. To improve reliability, many traders combine band touches with other signals like RSI divergence, bullish candlestick patterns, or a bounce off a support level before entering.

Bollinger Bands is one of the signals monitored daily in the AI-driven macro analysis on Convex Trading. The platform synthesises data across monetary policy, credit, sentiment, and on-chain metrics to generate actionable trade recommendations. Create a free account to build your own signal layer and see how Bollinger Bands is influencing current positions.

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