Indicators: RSI, MACD & Bollinger Bands
How to correctly use the 3 most popular indicators
Introduction to Technical Indicators
Technical indicators are mathematical calculations based on price, volume, or open interest data. They are designed to help traders identify trends, momentum, volatility, and potential reversal points. In this lesson, we cover three of the most essential and widely used indicators.
Categories of Indicators
1. Trend Indicators - Identify the direction of the trend (e.g., Moving Averages, MACD)
2. Oscillators - Measure momentum and identify overbought/oversold conditions (e.g., RSI, Stochastic)
3. Volatility Indicators - Measure the degree of price fluctuation (e.g., Bollinger Bands, ATR)
4. Volume Indicators - Analyze trading volume to confirm price movements
RSI - Relative Strength Index
What is RSI?
The Relative Strength Index (RSI) is a momentum oscillator developed by J. Welles Wilder Jr. in 1978. It measures the speed and magnitude of recent price changes to evaluate whether an asset is overbought or oversold.
How RSI is Calculated
RSI oscillates between 0 and 100 and is typically calculated over 14 periods (the default setting).
RSI = 100 - (100 / (1 + RS))
Where:
RS = Average Gain over n periods / Average Loss over n periods
Key RSI Levels
| Level | Interpretation |
|---|---|
| Above 70 | Overbought - The asset may be overvalued and due for a pullback |
| Below 30 | Oversold - The asset may be undervalued and due for a bounce |
| 50 level | Neutral - Acts as a dynamic support/resistance for RSI itself |
RSI Trading Strategies
#### Strategy 1: Overbought/Oversold
- Sell signal: RSI enters the overbought zone (above 70) and then crosses back below 70
- Buy signal: RSI enters the oversold zone (below 30) and then crosses back above 30
Important: In strong trends, RSI can remain overbought or oversold for extended periods. Do not blindly counter-trade overbought/oversold readings in trending markets.
#### Strategy 2: RSI Divergence
Divergence occurs when price and RSI move in opposite directions. This is one of the most powerful RSI signals.
Bullish Divergence:
- Price makes a lower low
- RSI makes a higher low
- Interpretation: Momentum is weakening even as price continues lower. Potential bullish reversal
Bearish Divergence:
- Price makes a higher high
- RSI makes a lower high
- Interpretation: Momentum is fading even as price continues higher. Potential bearish reversal
#### Strategy 3: RSI Trendline Break
Draw trendlines on the RSI indicator itself:
1. Connect RSI swing points with a trendline
2. When the RSI trendline breaks, it can precede a price reversal
3. This often provides an earlier signal than waiting for price to break its own trendline
#### Strategy 4: RSI 50-Level Crossover
- RSI crossing above 50 confirms bullish momentum
- RSI crossing below 50 confirms bearish momentum
- Use this as a trend filter in combination with other tools
RSI Settings
| Setting | Use Case |
|---|---|
| RSI(7) | More sensitive; good for scalping and day trading |
| RSI(14) | Standard setting; good for most timeframes |
| RSI(21) | Smoother; better for swing trading and daily charts |
MACD - Moving Average Convergence Divergence
What is MACD?
The MACD was developed by Gerald Appel in the late 1970s. It is a trend-following momentum indicator that shows the relationship between two moving averages of price.
MACD Components
The MACD consists of three components:
1. MACD Line = 12 EMA - 26 EMA (the difference between fast and slow moving averages)
2. Signal Line = 9 EMA of the MACD Line (a smoothed version of the MACD line)
3. Histogram = MACD Line - Signal Line (visual representation of the gap between the two lines)
How to Read MACD
- MACD Line above Signal Line = Bullish momentum
- MACD Line below Signal Line = Bearish momentum
- MACD above zero line = Overall uptrend
- MACD below zero line = Overall downtrend
- Histogram growing = Momentum is increasing
- Histogram shrinking = Momentum is decreasing
MACD Trading Strategies
#### Strategy 1: Signal Line Crossover
The most basic MACD strategy:
- Buy: MACD Line crosses above the Signal Line
- Sell: MACD Line crosses below the Signal Line
#### Strategy 2: Zero Line Crossover
- Bullish: MACD Line crosses above the zero line (12 EMA crosses above 26 EMA)
- Bearish: MACD Line crosses below the zero line
#### Strategy 3: MACD Divergence
Like RSI divergence, MACD divergence is a powerful signal:
Bullish Divergence:
- Price makes lower lows
- MACD makes higher lows
- Signal: Bearish momentum is exhausting
Bearish Divergence:
- Price makes higher highs
- MACD makes lower highs
- Signal: Bullish momentum is fading
#### Strategy 4: Histogram Reversal
Watch for the histogram to change direction:
- Histogram bars shifting from shrinking negative to growing positive = early bullish signal
- Histogram bars shifting from shrinking positive to growing negative = early bearish signal
MACD Settings
| Setting | Description |
|---|---|
| 12, 26, 9 | Standard default. Works well on most timeframes |
| 5, 35, 5 | More sensitive. Good for shorter timeframes |
| 8, 17, 9 | Balanced sensitivity for day trading |
Bollinger Bands
What Are Bollinger Bands?
Bollinger Bands were developed by John Bollinger in the 1980s. They consist of three lines that create a dynamic envelope around price, measuring volatility and identifying potential overbought/oversold conditions.
Components
1. Middle Band = 20-period SMA (the baseline)
2. Upper Band = Middle Band + (2 x Standard Deviation)
3. Lower Band = Middle Band - (2 x Standard Deviation)
How to Interpret Bollinger Bands
Bandwidth (Volatility):
- Bands widening = Volatility is increasing
- Bands narrowing (squeeze) = Volatility is decreasing, a breakout may be imminent
Price relative to bands:
- Price touching Upper Band = Strong bullish momentum (not necessarily overbought in a trend)
- Price touching Lower Band = Strong bearish momentum (not necessarily oversold in a trend)
- Price bouncing between bands = Range-bound market
Bollinger Band Trading Strategies
#### Strategy 1: Bollinger Bounce (Mean Reversion)
In a ranging market, price tends to bounce between the upper and lower bands, returning to the middle band (the "mean").
- Buy: Price touches or penetrates the lower band and shows a bullish reversal candle
- Sell: Price touches or penetrates the upper band and shows a bearish reversal candle
- Target: The middle band (20 SMA)
Warning: This strategy only works in sideways markets. In trending markets, price can "walk the band" for extended periods.
#### Strategy 2: Bollinger Squeeze (Breakout)
The Bollinger Squeeze is one of the most popular Bollinger Band strategies:
1. Identify the squeeze: Bands narrow significantly, indicating low volatility
2. Wait for the breakout: Price breaks decisively above the upper band or below the lower band
3. Enter in the direction of the breakout
4. Stop loss: On the opposite side of the middle band
Why it works: Periods of low volatility are always followed by periods of high volatility. The squeeze helps you prepare for the breakout.
#### Strategy 3: Walking the Bands (Trend Following)
In strong trends, price "walks" along the upper or lower band:
- Strong uptrend: Price stays near or above the upper band, bouncing off the middle band on pullbacks
- Strong downtrend: Price stays near or below the lower band, getting rejected at the middle band on rallies
- In a walk up, buy pullbacks to the middle band
- In a walk down, sell rallies to the middle band
1. Price touches the lower band and bounces (first bottom)
2. Price drops again but the second low is above the lower band
3. A "W" pattern forms, signaling a potential bullish reversal
4. The inverse (double top with the second high below the upper band) signals bearish reversal
Bollinger Band Settings
| Setting | Use Case |
|---|---|
| 20, 2 | Standard. Works on most timeframes and conditions |
| 10, 1.5 | More sensitive. Good for scalping |
| 50, 2.5 | Smoother. Good for longer-term analysis |
Combining the Three Indicators
Using RSI, MACD, and Bollinger Bands together creates a powerful analytical framework.
Example: Bullish Setup
1. Bollinger Bands: Price touches the lower band during a squeeze
2. RSI: Enters oversold territory (below 30) with bullish divergence
3. MACD: Histogram shows decreasing selling momentum; signal line crossover approaching
When all three indicators align, the probability of a successful trade increases significantly.
Example: Bearish Setup
1. Bollinger Bands: Price reaches the upper band and starts to reverse
2. RSI: Enters overbought territory (above 70) with bearish divergence
3. MACD: Bearish signal line crossover occurring
Common Indicator Mistakes
1. Using Too Many Indicators
Filling your chart with 5-7 indicators creates "analysis paralysis." Most indicators are derived from the same data (price), so adding more does not necessarily add more information.
Rule of thumb: Use a maximum of 2-3 indicators, preferably from different categories (e.g., one trend, one momentum, one volatility).
2. Ignoring the Trend
Counter-trend signals from oscillators fail frequently in trending markets. Always identify the primary trend first.
3. Treating Indicators as Stand-Alone Systems
No single indicator is reliable on its own. Combine indicator readings with price action, support/resistance, and candlestick patterns.
4. Not Confirming with Price Action
An indicator signal without a confirming candlestick pattern or S/R reaction is much weaker. Always let price confirm what the indicator is suggesting.
5. Chasing the Perfect Settings
The default settings work well in most situations. Constantly optimizing parameters leads to curve-fitting and poor live performance.
Key Takeaways
- RSI measures momentum on a 0-100 scale; above 70 is overbought, below 30 is oversold
- RSI Divergence is one of the most reliable signals for identifying potential reversals
- MACD combines trend and momentum analysis; signal line crossovers and divergences are key signals
- Bollinger Bands measure volatility; squeezes precede breakouts, and price touching the bands indicates strong momentum
- The most powerful setups occur when multiple indicators align (confluence)
- Never use indicators in isolation; always combine with price action and support/resistance
- Fewer indicators used well is better than many indicators creating confusion
- Stick with standard default settings unless you have a specific, tested reason to change them
Next Lesson: In the next lesson, we will shift to Fundamental Analysis and explore the Economic Factors That Move Markets.