What Is RSI (Relative Strength Index)? How to Use It

What Is the Relative Strength Index (RSI)?

The Relative Strength Index (RSI) is a momentum oscillator that measures the speed and magnitude of recent price changes to evaluate whether an asset is overbought or oversold. Developed by J. Welles Wilder Jr. in 1978, RSI produces a value between 0 and 100 — readings above 70 suggest the asset may be overbought, while readings below 30 suggest it may be oversold.

RSI is one of the most popular and versatile technical analysis indicators in trading. It appears on virtually every charting platform — MetaTrader 4/5, TradingView, cTrader, and every major broker's proprietary tools. Its popularity stems from its simplicity, its versatility across markets and timeframes, and the multiple types of signals it can generate.

In 2026, RSI remains a core component of both discretionary and algorithmic trading strategies. AI-driven trading systems frequently incorporate RSI as one of several momentum inputs. For retail traders, RSI offers a clear, visual way to assess momentum conditions before entering or exiting positions.

Risk warning: No technical indicator guarantees accurate predictions. Forex and CFD trading carries significant risk, and between 74-89% of retail accounts lose money. RSI should be used as part of a broader strategy, not as a standalone signal. Only trade with money you can afford to lose.

How Is RSI Calculated?

RSI = 100 - (100 / (1 + RS))

Where RS (Relative Strength) = Average Gain over N periods / Average Loss over N periods.

The standard setting uses 14 periods. Here is a simplified walkthrough:

1. Calculate the price change for each of the last 14 periods
2. Separate gains and losses (losses expressed as positive numbers)
3. Calculate the average gain: sum of gains / 14
4. Calculate the average loss: sum of losses / 14
5. Calculate RS: average gain / average loss
6. Apply the RSI formula

Example: Over 14 periods, the average gain is 1.2 pips and the average loss is 0.8 pips. RS = 1.2 / 0.8 = 1.5. RSI = 100 - (100 / (1 + 1.5)) = 100 - 40 = 60. An RSI of 60 is neutral, leaning slightly bullish.

After the initial calculation, subsequent RSI values use a smoothing method that makes the indicator less volatile and more consistent over time. You never need to compute this manually — every platform does it automatically.

How to Interpret RSI Overbought and Oversold Levels

The 70/30 levels are standard, but they require context:

Overbought (RSI above 70) does not automatically mean "sell." In strong uptrends, RSI can remain above 70 for extended periods. During the 2024-2025 bull run in major stock indices, the daily RSI stayed above 70 for weeks. Selling every overbought reading would have produced a series of losses. Overbought signals become actionable only when combined with other evidence — bearish candlestick patterns or a break of support.

Oversold (RSI below 30) does not automatically mean "buy." In strong downtrends, RSI can stay below 30 for extended periods. Look for additional confirmation — bullish divergence, a bounce off support, or a bullish engulfing candle.

Adjusting thresholds by market condition:

| Market Condition | Overbought Level | Oversold Level | Notes | |---|---|---|---| | Ranging market | 70 | 30 | Standard settings work well | | Strong uptrend | 80 | 40 | RSI stays elevated | | Strong downtrend | 60 | 20 | RSI stays depressed |

Using 80/20 instead of 70/30 filters for stronger signals. In trending markets, shifting to 80/40 (uptrends) or 60/20 (downtrends) reduces false signals significantly.

What Is RSI Divergence?

RSI divergence is one of the most powerful signals the indicator produces. It occurs when price and RSI move in opposite directions, suggesting the current trend is losing momentum.

Bullish divergence: Price makes a lower low but RSI makes a higher low. Selling momentum behind the second drop was weaker than the first. Often precedes a reversal upward.

Bearish divergence: Price makes a higher high but RSI makes a lower high. Buying momentum was weaker at the second peak. Often precedes a reversal downward.

Example on EUR/USD: Price drops to 1.0750 with RSI at 25. Price bounces, then drops again to 1.0720 (a lower low). RSI reads 32 (a higher low). The divergence suggests selling pressure is exhausting. A trader enters long after a confirming bullish candlestick pattern with a stop below 1.0720.

Hidden divergence is a less common variant. Bullish hidden divergence occurs when price makes a higher low but RSI makes a lower low — suggesting the uptrend will continue. Bearish hidden divergence is the opposite.

Divergence signals are not immediate. The actual reversal may take several candles to develop. Patience and confirmation are essential.

RSI Trading Strategies

Overbought/oversold reversals. Buy when RSI crosses back above 30 from oversold territory; sell when it crosses back below 70 from overbought. Add a filter: only take buy signals when price is above the 200-period moving average (confirming uptrend) and sell signals when below.

RSI divergence strategy. Watch for bullish divergence near support and bearish divergence near resistance. Enter after a confirming candle. Target the next significant support or resistance level.

RSI trendline breaks. Draw trendlines on the RSI panel itself. When RSI breaks a descending trendline, it can signal a bullish reversal before the price chart confirms it — providing early entry signals.

RSI with Bollinger Bands. Combine RSI oversold readings with price touching the lower Bollinger Band for high-probability buy setups. When both agree, the probability of a bounce increases.

RSI range shifts. In a new uptrend, RSI oscillates between 40 and 80. In a new downtrend, it shifts to 20-60. Recognizing these range shifts helps identify trend changes early — when RSI consistently holds above 40 after staying below 60, a new uptrend may be forming.

What RSI Settings Should You Use?

| Setting | Sensitivity | Best For | False Signal Rate | |---|---|---|---| | 7-period | High | Scalping, day trading | Higher | | 14-period | Medium | All styles | Moderate | | 21-period | Low | Swing, position trading | Lower |

The 14-period default provides a good balance for most trading styles. A 7-period RSI reacts faster and suits scalpers who need quicker responses. A 21-period RSI is smoother, filtering short-term noise for swing traders. Unless you have a specific reason to change it, start with 14.

RSI vs Other Momentum Indicators

RSI vs MACD. MACD is a trend-following momentum indicator based on moving average crossovers. RSI measures the magnitude of recent price changes. They complement each other well — RSI excels at identifying overbought/oversold conditions, while MACD is better at identifying trend direction.

RSI vs Stochastic Oscillator. Both oscillate between 0 and 100, but the Stochastic is more sensitive and generates more signals. RSI is smoother with fewer false signals. In ranging markets, the Stochastic may be slightly more useful. In trending markets, RSI is generally more reliable.

RSI vs Bollinger Bands. Bollinger Bands measure volatility; RSI measures momentum. They are complementary, not competing. Using both provides momentum and volatility context simultaneously.

For a complete toolkit, many traders combine RSI with moving averages for trend direction and candlestick patterns for entry timing. TradingView makes it easy to overlay multiple indicators on a single chart.

Frequently Asked Questions About RSI

What does an RSI of 50 mean?

An RSI of 50 means average gains and average losses over the lookback period are equal — a neutral state with no directional bias. Some traders use the 50 level as a trend filter: RSI above 50 favors long trades, below 50 favors short trades.

Can RSI be used on any timeframe?

Yes. RSI works on every timeframe from one-minute charts to monthly charts. However, higher timeframes produce more reliable signals. A daily RSI divergence is more significant than a 5-minute one. Match your timeframe to your trading style.

Is RSI better for trending or ranging markets?

RSI overbought/oversold signals work best in ranging markets where prices oscillate between support and resistance. In strong trends, these signals frequently produce false reversals. However, RSI divergence works well in trending markets to identify when the trend is weakening.

Should I use RSI alone to make trading decisions?

No. Combine RSI with price action analysis, support and resistance levels, and at least one other indicator. This multi-factor approach significantly improves signal quality. Our risk management guide covers building a complete trading approach.

Why does RSI stay overbought in a strong trend?

In a strong uptrend, buying momentum consistently outpaces selling momentum, keeping RSI elevated. This is a sign of strength, not weakness. Only when RSI begins making lower highs while price makes higher highs (bearish divergence) should you watch for a reversal.

Can RSI predict how far a price will move?

No. RSI tells you about momentum and potential turning points, but not the magnitude of a move. Use support/resistance levels, Fibonacci extensions, and previous swing highs/lows to set price targets.

How do I add RSI to my chart?

On MetaTrader, go to Insert > Indicators > Oscillators > Relative Strength Index. On TradingView, click Indicators and search for RSI. Default settings (14-period, 70/30 levels) are pre-configured. Brokers like IG and eToro include RSI in their built-in charting tools.

What is the difference between RSI and RSI smoothed?

Standard RSI uses the raw calculation. RSI smoothed applies an additional moving average, creating a less volatile version. Some traders plot both and look for crossovers between raw RSI and smoothed RSI as trade signals, similar to how MACD works.