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Relative Strength Index (RSI)
RSI is a tool that shows whether a stock is overbought or oversold. It gives a score between 0 and 100. If it’s above 70, the stock may be overbought; if it’s below 30, it may be oversold.
Key Takeaways
- RSI helps spot when a stock is overbought or oversold
RSI (Relative Strength Index) gives a value between 0 and 100. If it’s above 70, the stock may be overbought. If it’s below 30, it might be oversold. This helps traders decide when to buy or sell. - It works best in sideways markets.
RSI is most useful when prices are not trending strongly. It helps identify possible turning points when prices have been going up or down too much for too long. - Simple to use with basic rules: Traders buy when RSI rises above 30 and sell when it drops below 70. It becomes more powerful when used with other tools like candlestick patterns or MACD for confirmation.
Understanding RSI- Relative Strength Index
The Relative Strength Index (RSI), created by J. Welles Wilder, is a momentum-based indicator used to detect overbought and oversold conditions in the market. It helps traders anticipate possible trend reversals by analysing recent price movements. RSI values range from 0 to 100, and the current reading provides insight into potential market direction.
RSI is particularly useful when stocks are moving within a sideways or range-bound market. Since markets often lack strong trends, identifying potential reversal zones becomes essential, making RSI a valuable tool during such phases.
RSI Calculation with Formula
The calculation of RSI is based on the following formula:
Formula for RSI
RSI = 100 – [100 / (1 + Average Gain / Average Loss)]
Example of RSI Calculation
Let’s calculate with an example to help us better understand.
|
Sl No |
Closing Price |
Points Gain |
Points Lost |
|---|---|---|---|
|
1 |
120 |
0 |
0 |
|
2 |
123 |
3 |
0 |
|
3 |
119 |
0 |
4 |
|
4 |
122 |
3 |
0 |
|
5 |
121 |
0 |
1 |
|
6 |
124 |
3 |
0 |
|
7 |
122 |
0 |
2 |
|
8 |
125 |
3 |
0 |
|
9 |
128 |
3 |
0 |
|
10 |
127 |
0 |
1 |
|
11 |
126 |
0 |
1 |
|
12 |
130 |
4 |
0 |
|
13 |
132 |
2 |
0 |
|
14 |
135 |
3 |
0 |
In the table above, the points gained or lost refer to the difference between today’s closing price and the previous day’s close. For example, if today’s close is 104 and yesterday’s was 100, the gain is 4, and the loss is 0. On the other hand, if today’s close is 104 and yesterday’s was 107, the gain is 0, and the loss is 3. Note that losses are treated as positive values for calculation purposes.
For this calculation, we’ve used 14 data points, which is the standard default period known as the ‘look-back period.’ This means 14 days for daily charts or 14 hours for hourly charts. The first key step in calculating RSI is finding the RS (Relative Strength), which is the ratio of the average gains to the average losses over this period.
Average points gained = 24/14
Average points loss = 10/14
relative strength (RS) = 1.714/0.643 = 2.667
Plugging in the value of RS into the RSI formula:
RSI = 100 – 100/1+2.667
RSI = 100 – 100/3.67
RSI = 100-27.7273
RSI = 72.727
The overbought region occurs when the RSI shows significant buying pressure compared to recent trends. This often signals that the upward momentum may soon slow down. Conversely, the oversold region indicates intense selling pressure, suggesting that the downward trend might be nearing its end.
How To Trade the Relative Strength Index?
Trading with the relative strength index (RSI) is straightforward. The RSI ranges from 0 to 100, and technical analysts typically use the 30 and 70 levels as thresholds for generating buy and sell signals.
- Buy signal: Go long when the RSI moves from below to above the oversold line of 30.
- Sell signal: Go short when the RSI moves from above to below the overbought line of 70
On a trading terminal, RSI will look like this.
If Infosys has an RSI value nearing 90, it suggests the stock may be overbought. One should consider shorting opportunities, but it’s essential to confirm this with other analyses, like single or multiple candlestick patterns or other technical indicators.
RSI V/s MACD
MACD is one of the popular technical indicators; here is a table that shows the differences between them:
|
MACD |
RSI |
|---|---|
|
Shows trend direction and momentum |
Identifies overbought and oversold conditions |
|
Based on the difference between the two EMAs |
Based on average gains vs. losses over time |
|
Trending markets |
Sideways or range-bound markets |
|
Two lines + histogram |
Single line oscillating between 0 and 100 |
|
Crossovers with signal/zero line |
70 = Overbought, 30 = Oversold |
Conclusion
RSI is a simple yet powerful tool that helps traders identify overbought and oversold zones. It’s especially useful in sideways markets and can improve trading decisions when combined with other indicators. Understanding how to read RSI can give traders an edge in spotting potential trend reversals early.
Frequently Asked Questions on the RSI Indicator
What RSI is good to buy?
Traders often look for an RSI below 30 as a potential buying zone, as it suggests the stock may be oversold. However, it should always be confirmed with price action or other indicators.
Is RSI 100% accurate?
No. RSI is helpful, but it can give false signals during strong trends. It works best when combined with other tools rather than used alone.
Is high RSI bullish or bearish?
A high RSI (above 70) typically signals overbought conditions, which can mean the trend is strong but may be due for a pullback. It’s not automatically bearish; context matters.
How to analyse the RSI indicator?
Check whether RSI is above 70 (overbought) or below 30 (oversold), watch for divergences between price and RSI, and consider the strength of the trend before acting on any signal.
What is the best RSI setting?
The standard 14-period RSI is widely used and effective for most traders. Some short-term traders use 7 or 9 periods for faster signals, while long-term traders may prefer 21 periods for smoother readings.
Disclaimer: This content is for educational purposes only and does not constitute financial or investment advice. Investments in securities or other financial instruments are subject to market risk, including partial or total loss of capital. Past performance is not indicative of future results. Always consider your financial situation carefully and consult a licensed financial advisor before making investment or trading decisions.
