What is the RSI indicator?

admin 4 September 2021

The Relative Strength Index (RSI) is a technical indicator used in the analysis of financial markets. It is intended to plot the current and historical strength or weakness of a stock or market based on the closing prices of a recent trading period. Indicator should not be confused with relative strength.

As a forex trader or investor, you should know that using some methods can make it easier for you to achieve your goal. Technical analysis as an analytical method can determine the past and present movements of a market so that you can predict the future of an asset. Therefore, you can increase the chances of making a successful trade by predicting market movements. However, to use these methods, you need tools that usually apply mathematical formulas to draw more accurate points for you. One of these tools is the RSI indicator, which we will describe in detail here.

Nature and History of The RSI Indicator

RSI stands for Relative Strength Index. This indicator is known as one of the most popular indicators of technical analysis in financial markets. Welles Wilder developed the RSI Indicator in the 1950s. Wilder is a famous businessman and author who has introduced other well-known indicators to the world of financial markets, such as Parabolic SAR, Average True Range, and Directional Movement Concept (ADX). This indicator falls into the category of “momentum”, and it can measure the speed and change of price movements. In addition, the RSI can be considered an oscillator that moves in the range of 0 to 100.

How does the RSI indicator work?

It may seem that the calculation of the Relative Strength Index indicator is very complicated and confusing. Here we describe how this indicator works in the simplest possible way. First, you need to calculate the relative strength. You can calculate it by dividing the average profit by the average loss over a period of time. Then add the obtained number (RS) to 1 and divide the result by 100. Finally, the obtained result minus 100 will indicate the Relative Strength Index amount.


RS = Average Gain / Average Loss

Relative Strength Index formula
Relative Strength Index formula

When using technical analysis tools, the most important thing is knowing how to use and interpret them. To get the desired results, you should adjust this type of indicator based on your trading style. The most popular time period among traders is the 14-day period. However, you can increase or decrease these settings. If you already have some information about this indicator, you must have heard the buying and selling saturation levels. 30 and 70 are the sale and buy saturation levels, respectively, which can be changed based on your trading style. This means that these figures can fluctuate between 20 and 80.

Related Article: What is Fibonacci indicator?

On the one hand, we see extreme sales in the market When the RSI falls below 30. In other words, there is a possibility of price increases in the future. On the other hand, when this amount exceeds 70, it indicates excessive purchases, indicating lower prices in the future.

RSI indicator buy and sell signals
RSI indicator buy and sell signals

You can even change the data source. It is assumed that the RSI indicator will use closing prices. However, you can calculate RSI based on high, low, open and closed prices. Based on the traders’ experiences, the closing price is usually a better option than others.

Support and resistance levels in the RSI indicator

The downward and upward trend of the market plays a significant role in determining the performance of RSI. In a bullish market, the Relative Strength Index fluctuates between 40 to 90. The range of 40-50, in this case, acts as support levels. In a bearish market, this indicator fluctuates between 10-60. Resistance levels, in this case, will be between 50-60. In fact, all of these ranges may vary depending on the settings and the strength of the main process.


The RSI indicator (Relative strength index) is one of the most suitable indicators for technical analysis of market movements. Using this indicator, you can predict the bearish or bullish trends of a market in the near future. True predictions will give your trading positions more credibility. As we advised many times, do not rely on just one method and use this method in combination with others. What distinguishes your trades in the meantime is choosing a broker that can provide appropriate and diverse services in the market. Our offer is always the DeltaFX broker.

What is a Good RSI to Buy?

Traders looking for investment opportunities should look for RSI values that reach 30 or below. This allows them to look for investment options that may be undervalued where prices may rise in the future.

Should I Sell if RSI is Above 70?

The value of the indicator moves between 0 and 100. Theory suggests: When the RSI is above 70, the stock is overbought and when the Relative Strength Index value is below 30, it is overbought. So if the RSI crosses 70, you should sell the stock as it indicates that there are buyers. Overcoming the stock price and its correction is inevitable.

How do you calculate relative strength index?

Calculate relative strength (RS) by dividing the average positive price changes by the average negative price changes. Get the RSI by subtracting 100/(1 – RS) from 100.

Leave a Reply

Your email address will not be published.

Related Articles

Are you ready for trading?