The meaning of the RSI indicator in practice – What traders need to know?

Where does the RSI come from and what is its true meaning?

The RSI meaning or its full name, the Relative Strength Index, is a technical analysis tool that shows the momentum and direction of an asset's price. This indicator was created by J. Welles Wilder in 1978, who popularized it along with other similar tools through an older technical manual – New Concepts in Technical Trading Systems. Wilder started his career as an engineer and real estate developer, then turned to stock trading in the early 1970s. Although he was not initially successful, the results of his mathematical research and experiences led to the creation of indicators that are still used worldwide today.

The Basics of the RSI Indicator

The RSI is essentially a momentum oscillator that examines how quickly and to what extent the price changes. It measures the average gains and losses over a default period of 14, which is 14 days on daily charts and 14 hours on hourly charts, and then represents the result on a scale between 0 and 100.

The evaluation of the indicator is simple: if the RSI value rises above 70, it indicates that the asset is likely overbought (overbought state). Conversely, if the value drops below 30, it suggests that the asset is likely oversold (oversold state). Thus, the RSI helps traders recognize when the price movement may be excessive.

How can you adjust the RSI to your needs?

The RSI is not a fixed tool – traders can adjust the number of periods according to their needs. A shorter period, for example, 7 days, makes the indicator more sensitive to price movements, while a longer period, for example, 21 days, makes it smoother and more stable. For short-term trading, many use the levels of 20 and 80 instead of 30 and 70 to reduce false signals.

RSI and Divergence – Recognizing Hidden Trend Reversals

One of the most important applications of the RSI is the identification of bullish (bullish) and bearish (bearish) divergences. A bullish divergence occurs when the price decreases, but the RSI increases – this indicates that buying pressure is strengthening despite the drop. Bearish divergence is the opposite: the price increases, but the RSI decreases, indicating that momentum is waning.

However, it is important to note that RSI divergences are less reliable in markets with strong trends. They work best in sideways or mildly trending markets.

What is advisable to note when using the RSI?

The RSI is a useful tool, but it does not provide 100% accuracy. Most successful traders use this indicator in combination with other technical analysis tools to reduce the occurrence of false signals. The meaning of RSI ultimately lies in helping traders understand price momentum and the opportunities that come with it – but there are always numerous other factors to consider when making decisions.