Bollinger Bands Calculator

How to Use the Bollinger Bands Calculator

1. Enter Asset or Data: Choose "Ticker" to simulate data for a stock/crypto symbol (e.g., BTC-USD), or "Manual Data" to paste your own comma-separated closing prices.
2. Configure Settings:
   • Period: The number of candles used for the Moving Average (standard is 20).
   • Std Dev: The standard deviation multiplier for the bands (standard is 2).
3. Calculate: Click the button to generate the chart and values.
4. Analyze: Observe where the price is relative to the bands. Prices near the upper band may indicate overbought conditions, while prices near the lower band may indicate oversold conditions.

What are Bollinger Bands?

Bollinger Bands are a technical analysis tool defined by a set of trendlines plotted two standard deviations (positively and negatively) away from a simple moving average (SMA) of a security's price.

They were developed by financial analyst and trader John Bollinger in the 1980s. The purpose of Bollinger Bands is to provide a relative definition of high and low prices of a market. By definition, prices are high at the upper band and low at the lower band.

The Calculation Formula

• Middle Band = Simple Moving Average (SMA) of n periods
• Upper Band = Middle Band + (k × Standard Deviation)
• Lower Band = Middle Band - (k × Standard Deviation)

Where n is the Period (usually 20) and k is the Standard Deviation factor (usually 2).

Why Traders Use Bollinger Bands

• Volatility Measurement: The bands widen when the market is volatile and contract (the "squeeze") when the market is stable. A squeeze often precedes a significant price move.
• Trend Identification: Price walking up the upper band can indicate a strong uptrend, while walking down the lower band indicates a strong downtrend.
• Reversals: "M-Tops" and "W-Bottoms" are common reversal patterns identified using the bands.

Frequently Asked Questions