Bollinger Bands were developed by John Bollinger in the 1980s and remain one of the most widely used volatility indicators in crypto trading. At their core, they answer a simple question: Is price relatively high or relatively low right now?
How They're Calculated
The middle band is a 20-period Simple Moving Average (SMA). The upper band sits at Middle + (2 × σ) and the lower band at Middle − (2 × σ), where σ is the standard deviation of price over the same 20 periods. In our tool, you control the period with the MA Period slider.
What makes this powerful is that the bands are dynamic. When BTC goes from a boring $28,000–$29,000 range into a wild $31,000–$36,000 breakout week, the bands expand. When it settles back into a tight range, they contract. This contraction is called the Bollinger Squeeze.
Reading the Squeeze
A squeeze happens when volatility compresses to a local minimum. The bands narrow, price hugs the middle line, and volume often dries up. Historically, squeezes tend to resolve with a sharp directional move — the question is which direction.
In our TRIPLE strategy, we wait for price to break below the lower band during a period of elevated volatility. This means price has moved so far, so fast, that it's statistically extreme — a potential capitulation event. Combined with RSI and MACD confirmation, this becomes a high-probability entry.
Practical Tips for Crypto
- Shorter periods (10–15) work better on 4h and 1d charts for crypto's higher volatility
- W-Bottoms at the lower band are more reliable than single touches — wait for the second bounce
- When price walks the upper band, the trend is strong. Don't short just because it "looks overbought"
- Band width (Upper − Lower) is a standalone volatility metric. Track it.