# Bollinger Bands Indicator – Technical Analysis in Excel

You can use this template to build your own Bollinger Bands technical indicator for any stock.

• Bollinger Bands Concept
• Template and its Features

Page Contents

## What are Technical Indicators?

Technical indicators are calculations that are performed on the history of the stock, primarily the price and trading volume of the stock, in order to determine when to buy or sell.

There is a lot of technical indicators, commonly used by traders. There is also no limit to what calculation you use to identify trading signals – when to buy, when to sell, when not to buy or sell.

We will see how we can use Excel to calculate some of the most used technical indicators.

## What are ‘Bollinger Bands’?

Bollinger Bands is one of the most used technical indicators.

Bollinger Bands create a region or channel surrounding the Simple Moving Average (SMA) on both (above and below) sides. Instead of just relying on whether the price is above or below the SMA, we can allow for a certain tolerance on both sides, to accommodate certain variations or fluctuations.

### How to calculate Bollinger bands?

While the Moving Average Envelope allows a fixed % variation on either side of EMA, the Bollinger Bands take into account the standard deviation of the data points.

Upper Band line is SMA + (2 * STD DEV)

Lower Band line is SMA – (2* STD DEV)

### Parameters

Three parameters in this calculation are

1) Length of the moving average – how many periods to use for calculating average. Commonly used SMA length is 20.

2) Source – what value are we averaging. In the example we used the closing price of the stock.

Though Closing price is the most used for calculating simple moving average, you can also use High, Low, Open, and Volume as well.

3) STD DEV  – Standard Deviation

Example, a 2 Std Deviation will create a upper band line of SMA + (2*STD DEV) and lower envelope of SMA –(2* STD DEV)

### Signals

A potential trading signal strategy using the Bollinger Bands is listed below.

Once again there is no golden rule or a rule that works all the time. Otherwise, everyone will use that rule and make a lot of money easily. 😊

1. If the closing price moves from above the lower band line to below the lower band line, then a Buy signal is generated.
2. If the closing price moves from below the upper band line to above the upper band line, then a Sell signal is generated.

## Bollinger Bands Excel Template

The template will help you create the Bollinger Bands automatically and also calculate the trading signals instantly for any stock.

### How to create Bollinger Bands in Excel?

Type in a stock sticker symbol. If Excel does not recognize your stock symbol, it will pop up this data selector box.

You can select the stock you are interested in.

Period

The template can pull up to 5 years of price history by default. You can choose how much history to display on the chart easily using the slicer buttons.

The options are 5 Days, Month Till Date, 1 Month, 3 Months, 6 Months, Year Till Date, 1 Year, 5 Years.

Interval

The template allows price history at 3 different intervals.

Daily/Weekly/Monthly are the options.

### Bollinger Bands – Specific Inputs

Length: You can type in a length in periods. For example, in the above screenshot, we have entered 20 periods.

Source: Choose from the drop down list of the 5 options for source values.

Std Dev: Enter a number

The chart will update automatically based on all the above inputs.

The template shows the buy and sell signals on the chart, according to the signal rules stated earlier.

In addition, if the latest day has a Buy or Sell signal, it is displayed on the top next to the current price.

### Timezone

On the top right you can see the maximum of the last trade time of these currencies.

The default time that Microsoft provides is UTC.  The offset is set to -7 hrs, to convert to pacific time zone.

You can modify this if you need the time in a different time zone.

Visit https://savvytime.com/converter/utc to view offset

### How to refresh?

To refresh the price and other information, just use the regular Excel refresh in the Data ribbon.

## Requirements

Microsoft has introduced a new feature in Excel called Data types. One of the data types is ‘Stocks’. That’s what we will be using for these templates. This feature is available in Microsoft 365 Subscription Plans for PC and Web and Free Excel for the web