Short Answer
RSI (Relative Strength Index) is a momentum oscillator that measures the speed and magnitude of price changes. It ranges from 0 to 100, with readings above 70 indicating potentially overbought conditions (possible sell signal) and readings below 30 indicating potentially oversold conditions (possible buy signal). RSI also identifies divergences that can signal potential trend reversals.
Detailed Explanation
How RSI Works
RSI calculates the ratio of average gains to average losses over a specified period (typically 14 periods):
- Formula: RSI = 100 - (100 / (1 + RS))
- RS: Average gain / Average loss
- Period: Usually 14 periods (adjustable)
RSI Levels
Overbought Zone (70-100):
- Price may be too high
- Potential reversal downward
- Selling pressure may increase
- Consider taking profits or shorting
Oversold Zone (0-30):
- Price may be too low
- Potential reversal upward
- Buying pressure may increase
- Consider buying or covering shorts
Neutral Zone (30-70):
- Normal price action
- No extreme conditions
- Trend continuation likely
- Use with other indicators
How to Use RSI
1. Overbought/Oversold Signals
Overbought Signal:
- RSI crosses above 70
- Potential sell signal
- Wait for confirmation
- Consider taking profits
Oversold Signal:
- RSI crosses below 30
- Potential buy signal
- Wait for confirmation
- Consider buying opportunities
2. Divergences
Bullish Divergence:
- Price makes lower lows
- RSI makes higher lows
- Potential upward reversal
- Strong buy signal
Bearish Divergence:
- Price makes higher highs
- RSI makes lower highs
- Potential downward reversal
- Strong sell signal
3. Centerline Crossovers
Bullish Crossover:
- RSI crosses above 50
- Momentum turning positive
- Potential uptrend beginning
- Consider long positions
Bearish Crossover:
- RSI crosses below 50
- Momentum turning negative
- Potential downtrend beginning
- Consider short positions
RSI Settings
Default Settings
- Period: 14 (standard)
- Overbought: 70
- Oversold: 30
Custom Settings
Shorter Period (7-9):
- More sensitive
- More signals
- More false signals
- Better for short-term trading
Longer Period (21-25):
- Less sensitive
- Fewer signals
- More reliable signals
- Better for long-term trading
Trading Strategies
1. Overbought/Oversold Strategy
Entry:
- Buy when RSI crosses above 30 (oversold)
- Sell when RSI crosses below 70 (overbought)
Exit:
- Take profits at opposite extreme
- Use stop losses
- Consider risk/reward
2. Divergence Strategy
Entry:
- Buy on bullish divergence
- Sell on bearish divergence
Confirmation:
- Wait for price confirmation
- Use with other indicators
- Consider volume
3. Trend Following
Entry:
- Buy when RSI > 50 in uptrend
- Sell when RSI < 50 in downtrend
Exit:
- Use trailing stops
- Monitor for divergence
- Consider trend changes
Common Mistakes
Mistake 1: Trading Every Signal
Problem: Taking every overbought/oversold signal
Solution: Use RSI with other indicators and context
Mistake 2: Ignoring Divergences
Problem: Missing strong reversal signals
Solution: Always check for divergences
Mistake 3: Wrong Timeframe
Problem: Using RSI on wrong timeframe
Solution: Match RSI period to your trading timeframe
Mistake 4: Ignoring Context
Problem: Trading RSI in isolation
Solution: Combine with price action and other indicators
Best Practices
1. Combine with Other Indicators
- Use with moving averages
- Confirm with volume
- Check market structure
- Verify with patterns
2. Use Appropriate Settings
- Match period to timeframe
- Adjust for market conditions
- Test different settings
- Find what works for you
3. Wait for Confirmation
- Don't trade on RSI alone
- Wait for price confirmation
- Confirm with other indicators
- Consider market context
4. Manage Risk
- Use proper stop losses
- Size positions appropriately
- Consider risk/reward
- Have exit strategies
RSI in VaultCharts
VaultCharts provides:
- Standard RSI indicator
- Customizable periods
- Overbought/oversold levels
- Divergence detection
- Real-time updates