RSI - Relative Strength Index
The Relative Strength Index (RSI) is a momentum indicator that measures the speed and strength of price movements to identify overbought, oversold, and…
Indicator Overview
The Relative Strength Index (RSI) is a momentum oscillator developed by J. Welles Wilder that measures the speed and strength of recent price movements. The indicator helps traders identify overbought conditions, oversold conditions, momentum shifts, and potential trend reversals.
RSI is displayed as a line that moves between 0 and 100 and is most commonly calculated using a 14-period setting.
- Indicator Type: Momentum Oscillator
- Primary Use: Momentum & Reversal Analysis
- Default Setting: 14 Period
- Best Timeframes: All Timeframes
What RSI Measures
RSI compares the magnitude of recent gains to recent losses in order to measure momentum strength. When buying momentum increases, RSI rises higher. When selling momentum increases, RSI moves lower.
The indicator does not directly predict price direction but instead helps traders understand whether bullish or bearish momentum is becoming stronger or weaker.
How To Use RSI
Traders use RSI in several different ways depending on market conditions and trading style. The most common uses include identifying overbought and oversold conditions, spotting momentum divergence, and confirming trend strength.
Overbought & Oversold Conditions
When RSI moves above 70, the market is often considered overbought, meaning price may be extended to the upside and vulnerable to a pullback or consolidation.
When RSI moves below 30, the market is often considered oversold, meaning price may be extended to the downside and vulnerable to a bounce or reversal.
However, strong trends can keep RSI overbought or oversold for extended periods, so these levels should not be used as automatic buy or sell signals.
RSI Divergence
RSI divergence occurs when price and RSI move in opposite directions. This can signal weakening momentum and potential reversals.
- Bullish Divergence: Price makes a lower low while RSI makes a higher low
- Bearish Divergence: Price makes a higher high while RSI makes a lower high
Divergence is often used alongside support, resistance, and market structure for confirmation.
Trend Confirmation
RSI can also help confirm trend strength. During strong bullish trends, RSI often remains above 40–50 and frequently reaches overbought territory.
During strong bearish trends, RSI often remains below 50 and frequently reaches oversold territory.
Key RSI Levels
- 70: Traditional overbought level
- 30: Traditional oversold level
- 50: Midpoint often used to determine bullish or bearish momentum bias
- 80+: Extremely strong bullish momentum
- 20-: Extremely strong bearish momentum
Psychology Behind RSI
RSI reflects the balance between bullish and bearish momentum. As buyers become more aggressive, RSI rises higher. As sellers gain control, RSI declines lower.
Extreme RSI readings can signal emotional market conditions such as euphoria or panic, while divergence can indicate that momentum is fading even if price continues trending.
Confirmation Signals
- RSI divergence at key support or resistance
- RSI reclaiming the 50 level during bullish trends
- RSI rejection from the 50 level during bearish trends
- Confluence with market structure or chart patterns
- Volume confirmation alongside RSI signals
Weaknesses & Limitations
- RSI can remain overbought or oversold during strong trends
- False divergence signals can occur frequently
- Using RSI alone without market context can lead to poor trades
- Shorter RSI settings can create excessive noise
RSI should always be combined with price action, support/resistance, trend analysis, and risk management.
Example Trade Use
A trader may look for bullish divergence at a major support level while waiting for price confirmation before entering a long position. Alternatively, traders may use RSI above 50 to confirm bullish momentum during trend continuation setups.
Some traders also use RSI to avoid entering trades when the market appears excessively extended.
Risk Management Notes
RSI is a momentum tool, not a guaranteed reversal signal. Overbought does not always mean price will fall, and oversold does not always mean price will rise.
Traders should avoid using RSI in isolation and always define invalidation levels, manage position sizing appropriately, and combine RSI with broader market structure and confirmation signals.