Drawing standard deviation lines on a forex chart is a useful tool for traders as it helps to identify the volatility of the market. Standard deviation is a statistical measure that shows how much a data set deviates from its mean. In forex trading, standard deviation is used to measure the volatility of currency pairs.

### In this article, we will explain how to draw standard deviation lines on a forex chart.

### Step 1: Choose the Timeframe

The first step in drawing standard deviation lines is to choose the timeframe. You can choose any timeframe that suits your trading strategy. However, it is recommended to use a longer timeframe, such as daily or weekly, as it provides a more accurate representation of the market’s volatility.

### Step 2: Calculate the Mean

The next step is to calculate the mean of the currency pair for the chosen timeframe. The mean is the average price of the currency pair over a specified period. You can calculate the mean using any formula, but the most common formula is:

### Mean = (Sum of prices for the period) / (Number of prices for the period)

For example, if you want to calculate the mean for the EUR/USD currency pair for the past 20 days, you would add up the closing prices for each of the 20 days and divide the sum by 20.

### Step 3: Calculate the Standard Deviation

The next step is to calculate the standard deviation of the currency pair for the chosen timeframe. The standard deviation is a statistical measure that shows how much the prices of the currency pair deviate from the mean.

### There are different formulas to calculate the standard deviation, but the most common formula is:

Standard Deviation = Square root of [(Sum of (Price – Mean)^2) / (Number of prices for the period)]

For example, if you want to calculate the standard deviation for the EUR/USD currency pair for the past 20 days, you would first calculate the mean and then use the closing prices for each of the 20 days to calculate the standard deviation.

### Step 4: Draw the Standard Deviation Lines

The final step is to draw the standard deviation lines on the forex chart. The standard deviation lines are drawn above and below the mean, at a distance of one, two, or three standard deviations.

For example, if the mean for the EUR/USD currency pair for the past 20 days is 1.1200 and the standard deviation is 0.0050, you can draw the standard deviation lines as follows:

### – One standard deviation above the mean: 1.1250 (1.1200 + 0.0050)

### – Two standard deviations above the mean: 1.1300 (1.1200 + 0.0100)

### – Three standard deviations above the mean: 1.1350 (1.1200 + 0.0150)

### – One standard deviation below the mean: 1.1150 (1.1200 – 0.0050)

### – Two standard deviations below the mean: 1.1100 (1.1200 – 0.0100)

### – Three standard deviations below the mean: 1.1050 (1.1200 – 0.0150)

You can draw the standard deviation lines using a horizontal line tool on your forex chart. It is recommended to use different colors for each standard deviation line to make it easier to identify them.

### Conclusion

Drawing standard deviation lines on a forex chart is a useful tool for traders as it helps to identify the volatility of the market. By calculating the mean and standard deviation of a currency pair for a chosen timeframe, you can draw the standard deviation lines above and below the mean. These lines can help you to identify potential support and resistance levels, as well as to determine the risk and reward of a trade.