The Relative Strength Index (RSI) is one of the most widely used technical indicators in trading. Known for its simplicity and effectiveness, RSI helps traders assess market momentum and identify potential overbought or oversold conditions.

Whether you are new to technical analysis or refining an existing strategy, understanding how RSI works can improve timing, discipline, and decision-making when trading on MetaTrader 5 (MT5).

What Is the Relative Strength Index (RSI)?

The RSI is a momentum oscillator developed by J. Welles Wilder Jr. in 1978. It measures the speed and magnitude of recent price movements to evaluate whether an asset is trading at extreme levels.

RSI is displayed as a line oscillating between 0 and 100.

Key RSI Levels

• Above 70 (Overbought): Price may be overextended and vulnerable to a pullback
• Below 30 (Oversold): Price may be undervalued and due for a rebound

These levels do not predict reversals on their own; rather, they act as contextual signals.

Why RSI Matters in Trading

RSI functions as a momentum gauge, helping traders understand whether buying or selling pressure is strengthening or weakening.

• Overbought does not always mean “sell.”
• Oversold does not always mean “buy.”
• RSI works best when combined with price action, trend analysis, and other indicators

In strong trends, RSI can remain overbought or oversold for extended periods.

How RSI Is Calculated

RSI compares the average gains and losses over a set number of periods using the formula:

RSI = 100 – [100 / (1 + RS)]

Where: RS (Relative Strength) = Average Gain ÷ Average Loss

Default Setting

14 periods (standard across most platforms, including MT5)

Adjusting RSI Periods

• Shorter periods (7–9): More responsive, faster signals, higher noise
• Longer periods (21+): Smoother signals, fewer false positives

Most traders start with the default setting and adjust only after gaining experience.

How to Use RSI in Trading

1. Overbought and Oversold Signals

• RSI above 70 suggests buying momentum may be weakening
• RSI below 30 suggests selling pressure may be fading

Confirmation using candlestick patterns or support and resistance improves reliability.

2. RSI Divergence

Divergence occurs when price and RSI move in opposite directions, often signalling a loss of momentum.

Bullish Divergence:
Price makes lower lows, RSI makes higher lows → Potential upside reversal

Bearish Divergence:
Price makes higher highs, RSI makes lower highs → Potential downside correction

Divergence is most effective near key market levels.

Illustration of bullish and bearish divergence, showing how price movement and RSI can move in opposite directions to signal potential reversals.

3. The 50-Level (Trend Confirmation)

• RSI holding above 50 often confirms bullish momentum
• RSI holding below 50 often confirms bearish momentum

Crosses of the 50-level can signal shifts in market bias.

Using RSI to Identify Trends

In Uptrends

• RSI typically ranges between 40 and 90
• Pullbacks often find support near the 40–50 zone

In Downtrends

• RSI usually ranges between 10 and 60
• Rallies often stall near the 50–60 zone

Recognising these ranges helps traders avoid counter-trend entries.

Customizing RSI for Different Trading Styles

Short-Term Trading

• RSI Period: 7 or 9
• Faster signals for day trading and scalping
• Higher chance of false signals

Swing or Position Trading

• RSI Period: 14–21
• Smoother signals
• Better suited for trend-following strategies

Adjusting Thresholds

• Volatile markets: 80/20
• Stable markets: 70/30

Combining RSI with Other Indicators

• Moving Averages: Confirm overall trend direction
• Bollinger Bands: Validate price extremes
• MACD: Confirm momentum shifts and reversals

RSI should be part of a system, not a standalone trigger.

Advantages and Limitations of RSI

The Relative Strength Index (RSI) is easy to understand and apply, making it a popular tool for momentum analysis. It is effective for identifying overbought and oversold conditions, spotting divergence, and is readily available on all MT5 charts.

However, RSI has limitations: it can produce false signals in strongly trending markets and is not predictive when used on its own. Proper context and confirmation are essential, and understanding these limitations helps traders avoid over-reliance on the indicator.

Final Thoughts

The Relative Strength Index remains one of the most reliable and widely used indicators in technical analysis. When applied correctly, RSI helps traders understand momentum, identify potential reversals, and confirm trend strength.

By combining RSI with disciplined risk management and other technical tools on MT5, traders can build more structured and informed trading strategies with Best Wing Global.