Recently, someone asked me how to use RSI, so I decided to organize my complete insights.

Speaking of RSI, it’s essentially a measure of the strength of upward versus downward price movements over a certain period. Simply put, RSI values fluctuate between 0 and 100. The closer the number is to 100, the stronger the bullish momentum; conversely, the closer to 0, the stronger the bearish momentum. I’ve noticed many beginners see RSI above 70 and want to short, or below 30 and want to go long, but in actual trading, this often leads to pitfalls.

Let’s talk about overbought and oversold conditions. When RSI exceeds 70, it indeed indicates the market might be overly optimistic, with a potential pullback risk, but it doesn’t mean an immediate reversal. Similarly, RSI below 30 is just a reminder that the market might be overly pessimistic, increasing the chance of a rebound. The key is not to treat these signals as absolute truths; combining them with other indicators can improve success rates.

To understand how RSI works, you need to first understand its calculation method. The RSI formula is 100 minus 100 divided by (1 plus RS). It sounds complicated, but breaking it down isn’t hard. First, select a period (usually 14 candles), calculate the daily price changes within that period, then find the average gain and average loss. Divide the average gain by the average loss to get the RS value, and then plug it into the RSI formula to get a value between 0 and 100.

However, I most often adjust the sensitivity by changing parameters. The default RSI 14 is suitable for medium-term swing trading, especially on 4-hour and daily charts. But if you’re a short-term trader, RSI 6 makes the indicator more responsive, generating more signals but also more false alarms, so it needs to be filtered with other tools. Conversely, RSI 24 is better for long-term trend analysis, with fewer signals but higher accuracy. I personally adjust these flexibly based on different trading timeframes—there’s no absolute best parameter, only what suits your trading style.

Divergence is one of the signals I pay the most attention to. When the price hits a new high but RSI doesn’t follow suit, it’s a bearish divergence, indicating upward momentum may be weakening. Conversely, bullish divergence occurs when the price makes a new low but RSI doesn’t, suggesting downside momentum is fading and a rebound might be near. But remember, divergence is just a warning to be cautious; it’s not an automatic reversal signal. Strong trending markets often break through divergence signals.

In practical trading, I typically use RSI this way: First, observe overbought and oversold zones to gauge extreme market sentiment. Second, combine divergence signals to assess whether momentum is aligned. Third, sometimes I look at RSI crossing the midline 50 to identify trend changes, but I prefer to use RSI 24 for filtering out noise.

The biggest pitfall is relying too heavily on RSI during strong trending markets. I’ve seen many traders rush to short when RSI hits over 80, only to get squeezed and get wiped out. Also, ignoring the timeframe differences can be costly—an oversold signal on the hourly chart may look tempting, but if the daily trend is still down, that bounce could just be a fleeting correction.

Ultimately, RSI is just a tool, not a holy grail. I use it to help identify overreactions and whether momentum is sufficient, but I never trade solely based on RSI. Combining it with MACD, moving averages, or candlestick patterns is a more robust approach. Many beginners fall into the trap of over-relying on a single indicator when they first learn RSI, neglecting the importance of trend analysis and support/resistance levels.

In summary, spend some time understanding the logic behind the RSI formula, find parameters that fit your trading style, and combine it with other tools for confirmation. This approach will yield much better results over time.