RSI Indicator: Complete Guide
The Relative Strength Index (RSI) is one of the most popular momentum indicators in trading. Created by J. Welles Wilder, it measures the speed and magnitude of price changes.
What is RSI?
RSI is an oscillating indicator that ranges from 0 to 100. It measures momentum by comparing the magnitude of recent gains to recent losses.
RSI Scale:
100 ─────────
← Overbought (70-100)
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← Neutral (30-70)
╱ ╲
╲
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← Oversold (0-30)
0 ─────────
RSI Formula
RSI = 100 - (100 ÷ (1 + RS))
RS = Average Gain ÷ Average Loss
Default settings: 14 periods
Key Levels
| Level | Meaning |
|---|---|
| 70+ | Overbought (potential reversal) |
| 30- | Oversold (potential reversal) |
| 50 | Neutral |
RSI Settings
| Timeframe | Period | Sensitivity |
|---|---|---|
| Daily | 14 | Standard |
| 4-Hour | 14 | Standard |
| 1-Hour | 9-10 | More sensitive |
| 15-Minute | 7-9 | Very sensitive |
How to Use RSI
1. Overbought/Oversold (Basic)
Traditional interpretation:
- RSI > 70 = Overbought = Consider SELLING
- RSI < 30 = Oversold = Consider BUYING
Problem in strong trends: RSI can stay overbought/oversold for extended periods.
Solution: Only trade reversals in ranging markets.
2. Divergence (Advanced)
Bullish Divergence:
Price: Lower low
RSI: Higher low
Meaning: Reversal potential UP
Bearish Divergence:
Price: Higher high
RSI: Lower high
Meaning: Reversal potential DOWN
3. RSI MA Cross
RSI crossing its own moving average:
- RSI crosses above MA = BUY signal
- RSI crosses below MA = SELL signal
4. Trend Confirmation
| Trend | RSI Behavior |
|---|---|
| Uptrend | Stays above 40-50 |
| Downtrend | Stays below 40-50 |
RSI below 40 in uptrend = Potential buying opportunity RSI above 60 in downtrend = Potential selling opportunity
RSI Trading Strategies
Strategy 1: RSI Reversal (Range)
Entry Conditions:
- RSI < 30 (oversold)
- Price bounces off support
- Confirmation candle forms
Stop: Below recent swing low
Target: Previous high, or 2:1
Strategy 2: RSI Divergence
Entry Conditions:
- Divergence forms (price vs RSI)
- Price breaks trendline
- RSI crosses back to neutral
Stop: Beyond divergence point
Target: Next structure
Strategy 3: RSI Trend Confirmation
Entry Conditions:
- Uptrend confirmed
- Price at key support
- RSI bouncing from 40-50
Stop: Below support
Target: New high
RSI Best Practices
Timeframes
| Timeframe | Best For |
|---|---|
| Daily | Swing trading |
| 4-Hour | Multiple-day trades |
| 1-Hour | Intraday |
Markets
| Market | RSI Effectiveness |
|---|---|
| Ranging markets | High |
| Strong trends | Low (stays extreme) |
| Crypto | High |
| Forex | Medium |
Common RSI Mistakes
1. Trading RSI Alone
Problem: Entering when RSI = 30 without price confirmation.
Result: Price keeps falling.
Solution: Wait for price confirmation.
2. Ignoring Trend
Problem: Buying at RSI = 30 in strong downtrend.
Result: Fighting the trend.
Solution: Use with trend direction.
3. Wrong Period
Problem: Using 14-period on 5-minute chart.
Result: Too many false signals.
Solution: Adjust period to timeframe.
4. No Confirmation
Problem: Trading RSI reading alone.
Result: Low success rate.
Solution: Combine with support/resistance.
RSI vs Other Indicators
| Indicator | Best For |
|---|---|
| RSI | Mean reversion |
| MACD | Trend momentum |
| Stochastic | Fast crossovers |
RSI Checklist
☐ Trend identified?
☐ RSI at extreme?
☐ Price at support/resistance?
☐ Confirmation formed?
☐ Stop placed properly?
☐ Target set?
Related Topics
- Indicators — Other indicators
- MACD — Momentum indicator
- Volatility — Context
- RSI-Strategy — Trading setup
RSI shows momentum. Confirm with price.