A Bollinger Band is 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, but which can be adjusted to user preferences.

In the above chart we see the bollinger bands. This indicator was plotted using a 20 period simple moving average which is the red line and 2 standard deviations (positively and negatively) from the 20 period simple moving average which are represented by the blue lines on either side of the 20 period simple moving average.

Use this link to get more information on how Bollinger Bands are calculated:

https://www.iforex.in/education-center/bollinger-bands#:~:text=To%20calculate%20the%20upper%20Bollinger,is%20the%20lower%20Bollinger%20Band.

So how do you use the Bollinger bands in a scalping trading strategy?

Reversals

When price exits either the upper or lower Bollinger bands it can be seen as a signal for a reversal. This can also signal overbought or oversold conditions in the market. When price moves closer to or exits the upper band then the market is likely overbought and a reversal is likely to occur. When price moves closer to or exits the lower band then the market is likely oversold and a reversal is likely to occur.

Long Position

A long position entry signal would occur when price exits the lower band of the bollinger bands. You can also use reversal candlesticks as a confirmation of the signal.

In the image above, we see a long position entry signal at the point marked by the green arrow. Price exitis the lower band of the bollinger bands which is followed by a green doji candlestick which acts as a confirmation for our long position entry. A long position opened at that point is profitable as price moves up.

Short Position

A long position entry signal would occur when price exits the upper band of the bollinger bands. You can also use reversal candlesticks as a confirmation of the signal

In the image above, we see a short position entry signal at the point marked by the red arrow. Price exits the upper band of the Bollinger bands which is followed by a green doji candlestick which acts as a confirmation for our short position entry. A short position opened at that point is profitable as price moves down.