Relative Strength Index

The Relative Strength Index (RSI) is a technical analysis indicator developed by J. Welles Wilder to measure the speed and strength of price movements. It is usually calculated using a 14-period timeframe and produces readings between 0 and 100.

Key points:

• RSI above 70 generally indicates an overbought condition.
• RSI below 30 generally indicates an oversold condition.
• RSI around 50 reflects neutral momentum.
• Traders use RSI to assess trend strength and identify possible reversals.
• RSI divergence can signal weakening momentum.

• RSI convergence can confirm an existing trend.

  
  

The Relative Strength Index (RSI) is a momentum oscillator developed by J. Welles Wilder. It helps traders evaluate the speed and magnitude of price changes and identify shifts in market momentum.

RSI values range from 0 to 100 and are commonly calculated over 14 periods. The indicator is displayed below a price chart, making it easier to assess momentum alongside price action.

Common RSI levels

These levels help traders assess whether buying or selling pressure may be becoming excessive.

The Relative Strength Index (RSI) is a momentum oscillator developed by J. Welles Wilder. It helps traders evaluate the speed and magnitude of price changes and identify shifts in market momentum.

RSI values range from 0 to 100 and are commonly calculated over 14 periods. The indicator is displayed below a price chart, making it easier to assess momentum alongside price action.

Common RSI levels

These levels help traders assess whether buying or selling pressure may be becoming excessive.

How is the RSI calculated?

RSI uses a mathematical formula based on average gains and average losses during a selected period.

RSI formula

RSI = 100 − (100 ÷ (1 + RS))

Where:

RS = Average Gain ÷ Average Loss

Steps to calculate RSI

1. Select a timeframe, commonly 14 periods.
2. Calculate the average gain during the period.
3. Calculate the average loss during the period.
4. Divide the average gain by the average loss to determine RS.
5. Apply the RS value to the RSI formula.
6. Calculate the final RSI reading.

Example calculation

An RSI reading of approximately 71.4 may indicate that the asset is in an overbought zone.

RSI is one of the most widely used momentum indicators because it provides insights into price strength and market sentiment.

Identifies overbought and oversold conditions

RSI helps traders determine whether an asset has experienced an extended upward or downward move.

• Above 70: Potential overbought condition.
• Below 30: Potential oversold condition.

Helps confirm trend strength

RSI can support trend analysis by showing whether bullish or bearish momentum remains strong.

• Sustained readings above 50 may support an uptrend.
• Sustained readings below 50 may indicate downward momentum.

Highlights potential reversals

When price and RSI move differently, it can indicate weakening momentum and a possible trend reversal.

Supports timing decisions

Many traders combine RSI with support levels, resistance zones, trendlines, and moving averages to improve entry and exit decisions.

RSI compares recent gains and losses to determine momentum. It is commonly used to identify conditions where prices may have moved too far in one direction.

For example, if an asset has an RSI reading of 75, traders may interpret this as a sign that bullish momentum has become extended.

RSI behaviour often changes depending on the prevailing market trend.

During an uptrend, RSI frequently remains above 30 and may approach or exceed 70. During a downtrend, RSI often struggles to move above 70 and may repeatedly fall towards 30.

These patterns can help traders assess trend strength and identify possible turning points in the market.

RSI divergence occurs when price and RSI move in opposite directions. Traders often view divergence as a potential warning sign that momentum is weakening.

Types of RSI divergence

Although divergence can provide useful signals, many traders seek confirmation from other indicators before acting.

RSI convergence occurs when both price and RSI move in the same direction. This alignment is often used to confirm the strength of the current trend.

Examples of convergence

Convergence may indicate that the prevailing trend still has momentum.

What makes the RSI indicator important?

RSI remains popular because it is relatively simple to understand and can be applied across different markets and timeframes.

Key benefits include:

• Measuring market momentum.
• Identifying overbought conditions.
• Identifying oversold conditions.
• Confirming trend strength.
• Detecting potential reversals.

• Supporting technical analysis decisions.

  
  

Because RSI focuses on momentum, it is commonly used alongside other technical indicators rather than as a standalone tool.

Although RSI can provide valuable insights, it has several limitations.

To address these limitations, traders often combine RSI with moving averages, trendlines, and other technical indicators.

The Relative Strength Index (RSI) is a momentum oscillator that measures the speed and strength of price movements using a scale of 0 to 100. By helping identify overbought and oversold conditions, confirming trend strength, and highlighting potential reversals, RSI remains one of the most widely used tools in technical analysis.

However, RSI works best when combined with other indicators and broader market analysis. Using multiple tools can help reduce the impact of false signals and provide a more complete view of market conditions.