Trading Indicators: How to Use RSI and Bollinger Bands

Two Indicators. Zero Magic.

If someone tells you RSI or Bollinger Bands can predict the future, walk away. These tools don’t predict anything. What they do — when used correctly — is give you a statistical edge in understanding where price is relative to its recent history. That’s it. But that “it” is worth a lot when combined with proper risk management.

RSI: What It Actually Measures

The Relative Strength Index, created by J. Welles Wilder in 1978, measures the speed and magnitude of recent price changes on a scale from 0 to 100.

The Formula (Simplified)

RSI = 100 – (100 / (1 + RS)), where RS = Average Gain over N periods / Average Loss over N periods. The standard setting is 14 periods.

When RSI is high (>70), recent gains have been large relative to losses — the asset is “overbought.” When it’s low (<30), recent losses dominate — it's "oversold."

The Dangerous Myth: “RSI 70 = Sell”

This is the most common mistake I see beginners make. An RSI above 70 does NOT mean you should sell. In strong uptrends, RSI can stay above 70 for weeks or even months. During Bitcoin’s 2021 rally from $30K to $69K, RSI was above 70 for extended periods. Selling every time RSI hit 70 would have cost you the entire bull run.

How to Actually Use RSI

• Divergence: The most powerful RSI signal. If price makes a new high but RSI makes a lower high, momentum is weakening. This “bearish divergence” precedes many major reversals.
• Range shifts: In uptrends, RSI tends to oscillate between 40 and 80. In downtrends, it oscillates between 20 and 60. Use these shifted ranges instead of the static 30/70 levels.
• Centerline crossover: RSI crossing above 50 signals bullish momentum; below 50 signals bearish. Simple but effective as a trend filter.

Bollinger Bands: Volatility, Not Direction

John Bollinger’s bands (created in the 1980s) consist of three lines:

• Middle band: 20-period Simple Moving Average (SMA)
• Upper band: SMA + 2 standard deviations
• Lower band: SMA – 2 standard deviations

Statistically, about 95% of price action should fall within the bands. When price touches or exceeds a band, it’s statistically unusual — but “unusual” doesn’t mean “reversal.”

The Squeeze: Where the Real Edge Is

When the bands narrow (low volatility), a big move is coming. This is called the “Bollinger Band Squeeze.” The bands are essentially saying: “Something is about to happen.” The catch? The squeeze tells you WHEN, not WHICH DIRECTION.

To determine direction, combine the squeeze with other indicators. In my trading system, I pair the Bollinger Squeeze with Keltner Channels — when Bollinger Bands fall inside the Keltner Channel, the squeeze is confirmed. The breakout direction after the squeeze determines the trade.

Band Walks

In strong trends, price “walks” along the upper or lower band. This is NOT a signal to trade against the trend. If price keeps touching the upper band, the trend is strong. Only look for reversals when price starts to move away from the band AND other confirmation signals agree.

Combining RSI and Bollinger Bands

Used together, these two indicators cover different dimensions:

• RSI measures momentum (how fast is price moving?)
• Bollinger Bands measure volatility (how much is price moving?)

High-Probability Setup Example

1. Bollinger Bands are in a squeeze (bands narrowing)
2. RSI is near 50, showing neutral momentum
3. Squeeze breaks to the upside (price closes above upper band)
4. RSI simultaneously crosses above 50 from below
5. Entry: on the breakout candle close
6. Stop-loss: below the lower Bollinger Band

This setup captures the transition from low volatility to high volatility with momentum confirmation. It’s not guaranteed to work every time — nothing is — but it puts probability in your favor.

Related Reading

• Technical Analysis 101: It’s About Probability, Not Prediction
• RSI Indicator Explained: Why “70 = Sell” Is a Dangerous Myth
• Trading Psychology: How to Stop FOMO and Panic Selling
• Bitcoin Price Prediction 2026: Institutional Money Flow
• Bitcoin ETF in 2026: IBIT, FBTC & The Global Race — Everything You Need to Know

What These Indicators Can’t Do

• They can’t predict black swan events (exchange hacks, regulatory bans)
• They lag — they’re based on historical price data, not future prices
• They generate false signals, especially in choppy/ranging markets
• They work best as filters, not standalone signals

In my trading system, RSI and Bollinger Bands are two of six filters that must agree before a trade is taken. No single indicator is reliable enough on its own. The edge comes from convergence — when multiple independent measurements point in the same direction.