January 20, 2026
7 mins read
The Relative Strength Index (RSI) is a momentum oscillator which can determine whether a stock is overbought or oversold based on recent price movements. The RSI is used in addition to other technical analysis tools. The RSI was developed to help assess momentum and potential changes in price movement of a stock based on the recent price action. RSI values range from 0 to 100, with readings above 70 and below 30 commonly used to identify overbought and oversold conditions.
The Relative Strength Index (RSI) is a tool that helps you understand how strong or weak the price of a stock or asset is. It shows if something is becoming too expensive (overbought) or too cheap (oversold).
It works by comparing how much a stock has gone up versus how much it has gone down over a set period. This way, you can guess whether prices might continue the same way or start to reverse.
Have you ever felt unsure about whether a stock is the right pick?
That’s where RSI comes in! Made by J. Welles Wilder Jr. in 1978, it helps you decide when it might be a good idea to buy or sell, based on how the market has been moving recently.
RSI is like a speedometer for price changes. It measures how fast and how much prices are moving. The score runs from 0 to 100.
If RSI is above 70, the stock may be too costly (overbought).
If RSI is below 30, the stock may be too cheap (oversold).
This helps you find good moments to enter (buy) or exit (sell) trades.
However, RSI works better when prices move within a range, not during very strong uptrends or downtrends. That’s why traders often combine RSI with other tools or patterns to double-check signals.
One common method is spotting divergence. If the price and RSI are moving in opposite directions, it may hint at a trend change.
Don’t worry—it sounds harder than it is! Here’s the basic formula:
RSI = 100 – [100 / (1 + RS)]
Here, RS means Relative Strength, which is simply the average gain divided by the average loss over 14 days.
Steps:
Find the average gains and losses over the last 14 days.
Divide average gain by average loss to get RS.
Put RS into the formula above.
Example: If the average gain is 2 and the average loss is 1, then RS = 2 ÷ 1 = 2. Plugging it in, RSI = 66.67. That means the stock is moving toward the overbought zone but not yet above 70.
Traders often smooth out the numbers using moving averages to make RSI more accurate.
RSI tells you whether a stock might be overpriced or underpriced:
Above 70 = Overbought → Could be time to sell or wait.
Below 30 = Oversold → Could be time to buy.
These levels help you understand when prices may be too high or too low and might soon return to normal. By learning to read RSI, you can make smarter investment choices.
Another handy way to use RSI is by looking for divergence. This happens when the RSI and the actual price are not moving in the same direction.
If the price makes higher highs but RSI makes lower highs → this could be a sign of bearish divergence (prices may fall soon).
If the price makes lower lows but RSI makes higher lows → this is bullish divergence (prices may rise soon).
Divergence often shows up before a big trend change, so it’s a powerful signal to watch.
RSI divergences are one of the most powerful signals traders look for. A divergence occurs when the price moves in one direction, but the RSI shows the opposite momentum. This often signals that a reversal could be coming soon.
Imagine a stock making lower lows, but the RSI forms higher lows. This mismatch suggests that selling momentum is weakening. Traders see it as a sign of a possible upward reversal.
On the other hand, if prices make higher highs while RSI shows lower highs, it indicates weakening buying strength. This often warns of a potential price drop.
Divergences appear before actual price reversals, giving traders a chance to prepare.
Traders often combine divergence signals with support-resistance levels or moving averages to avoid false alarms.
The Relative Strength Index (RSI) is one of the most widely used technical indicators in trading. It helps you judge whether a stock or index is overbought, oversold, or somewhere in between. Understanding RSI gives you an edge in timing entries and exits.
When RSI moves above 70, it signals potential overbought conditions. When it falls below 30, it suggests oversold levels. These zones help traders anticipate reversals.
RSI adds a layer of confidence to trading strategies. Instead of relying only on price charts, traders use RSI to confirm momentum.
RSI isn’t limited to stocks. You can apply it to forex, commodities, and indices, making it versatile for all kinds of traders.
RSI provides objective signals, helping you avoid impulsive decisions driven by fear or greed.
Like every tool, RSI isn’t perfect. Here’s what you should know:
It doesn’t look at volatility (how wild prices swing)
It’s a lagging indicator, meaning it follows price moves rather than predicting them.
Markets can stay overbought or oversold for a long time, so RSI alone isn’t always reliable.
That’s why you should combine RSI with other tools like volume or chart patterns for safer trading.
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If the RSI goes above 70, it usually means the stock is overbought. In other words, the price has climbed too quickly and might soon drop a little or slow down.
The ideal way to use RSI is by watching when it goes above 70 or below 30. Above 70 often signals selling or waiting, while below 30 may mean buying. It works even better when combined with other indicators.
An RSI reading lower than 30, shows the stock has likely dropped too low, and you might have a potential opportunity to buy as it may pop back up.
RSI can help you identify trend changes through divergence. If the direction of the RSI and the price are moving in opposite directions, it usually means that trend is more likely to reverse soon, either up or down.
Yes, you can use RSI alongside tools like MACD or moving averages. This makes your trading decisions stronger because you’re confirming signals instead of relying on RSI alone.
RSI divergence happens when the price and RSI don’t match. If the RSI suggests strength but the price shows weakness, or vice versa, it could signal a change is coming. This is why divergence is important for spotting early trend shifts.
Most traders use a 14-day RSI, but this can be adjusted. A shorter period, like 7, makes RSI quicker and more sensitive. A longer period, like 21, makes it calmer and less jumpy.
Yes, RSI has limits. In strong trends, it can sometimes give false signals, showing overbought or oversold conditions even though the trend continues. That’s why traders often combine it with other indicators for better accuracy.
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