How to Read RSI (Relative Strength Index): A Practical Guide for Traders
Lloyd Collingham · 24 June 2026
The Relative Strength Index (RSI) measures the speed and magnitude of recent price movements on a scale of 0 to 100. It's a momentum oscillator, not a price predictor — a distinction that trips up a lot of newer traders.
How RSI Is Calculated
RSI compares the average size of recent gains to the average size of recent losses over a set period (typically 14 sessions). A reading above 70 is traditionally labelled 'overbought' and below 30 'oversold' — but these thresholds describe momentum extremes, not guaranteed reversal points.
The Mistake Most Traders Make
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Shorting every stock the moment RSI crosses above 70 is one of the fastest ways to lose money in a strong trend. Momentum can stay 'overbought' for weeks during a genuine breakout. RSI works best combined with trend context — using it to time entries within an established trend rather than fight it.
A Better Way to Use RSI
- ▪ In an uptrend, look for RSI pullbacks to the 40-50 zone as potential entry points, not the 70 level as an exit signal
- ▪ Watch for divergence: price making a new high while RSI makes a lower high often precedes a reversal
- ▪ Combine RSI with volume and support/resistance levels rather than trading it in isolation
Our Wolf School RSI Mastery lesson walks through live chart examples of each of these patterns, and our Smart Screener can filter the entire market for stocks matching specific RSI conditions in real time.
