Stock trading is a vast field that comprises numerous tools and indicators to assist traders in their decisions. Another widely used and probably the most popular indicator is the Relative Strength Index or RSI. This effective indicator can prove useful in revealing the current trends in the market and assist the trader in finding good entry or exit points. In this article, you will learn what RSI is all about, how it is computed and how you can incorporate it into your stock trading.
What is RSI?
The Relative Strength Index (RSI) is an indicator that shows the extent of the strength or weakness of the price movements. This indicator was introduced by J. Welles and Wilder Jr. in his book of 1978 New Concepts in Technical Trading Systems. The RSI ranged from 0 to 100 and is used in identifying the over controlling or under controlling of a stock.
Formula:
RSI = 100 – [100 / (1 + RS)] where RS (Relative Strength) = The average of the last x days’ up closes / The average of the last x days’ down closes.
The common setting for RSI is the 14 periods, but this may vary depending on the trader’s decisions and practices.
How RSI Works
RSI presents a quantitative measure ranging from 0 to 100, which enables traders to establish the force of a stocks price trend. Here’s how to interpret the RSI values:
RSI above 70: This means that a stock might be overpurchased. An overbought condition means that the stock has been in a sharp up move and the rates of rise are slowing down and may reverse or correct.
RSI below 30: This means that potentially a stock may be over sold. An oversold condition implies that for a certain period the stock price has been declining and may be ready for a bounce.
RSI around 50: Level 50 can be considered as the neutral point that shows the stock is neither over bought nor over sold.
Relative Strength Index in Trading Stocks
RSI is a highly effective tool to help in the decision making of trading activities; however, it is paramount to incorporate other analysis techniques and other indicators. Here are some common ways to use RSI in stock trading:

- Identifying Overbought and Oversold Conditions:
- RSI Divergence:
- Support and Resistance Levels:
- RSI as a Confirmation Tool: