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RSI Relative Strength Index

An oscillator that shows how stretched a move is. Here is what the 70 and 30 zones really mean, why "overbought" is not a sell signal, and how to spot divergences.

Way to Lambo · 6 min read · level: beginner

Contents
  1. What it is
  2. How to read the zones properly
  3. Divergences
  4. How to use it
  5. Common mistakes

In short

What it is
An oscillator from 0 to 100 comparing the strength of up and down candles over 14 periods.
Zones
Above 70 is overbought, below 30 is oversold.
Strength
Divergences: when price and RSI disagree, it often warns that a trend is fading.
Weak spot
In a strong trend RSI sits above 70 for weeks, and shorting "overbought" drains the account.

What it is

RSI (Relative Strength Index) compares the average gain of candles with the average loss over a chosen period, usually 14 candles. The result is scaled from 0 to 100. When up candles are clearly stronger than down candles, RSI is high; when the opposite is true, it's low.

Readings above 70 are called overbought, below 30 oversold. That is not a "sell" or "buy" command — it only describes the move as stretched.

RSI: exits from overbought and oversold zonesRSI 147030RSI 14zones 70 / 30
The signal is not entering a zone but leaving it. Illustrative data.

How to read the zones properly

The most common mistake is to sell as soon as RSI crosses 70. In a strong trend the indicator can stay there for a long time while price keeps rising.

  • The signal is the exit from the zone. RSI drops back below 70 after being overbought — momentum is fading. It climbs back above 30 after being oversold — sellers are weakening.
  • Respect the trend. In an uptrend look only for longs after oversold readings; in a downtrend only for shorts after overbought ones.
  • The 50 level. RSI above 50 — buyers have the edge; below — sellers. A simple direction filter.

Divergences

A divergence is a disagreement between price and the indicator. Bearish: price makes a new high while RSI makes a lower high than before. The rally continues on less strength. A bullish divergence is the mirror image at the lows.

Bearish divergence: price higher, RSI lowerRSI 147030price: higher highRSI 14RSI: lower high
Price made a new high, RSI didn't. A few candles later the trend reversed.

A divergence is a warning, not an entry signal. It can last a long time and "repaint" several times. Enter only after confirmation: a break of structure, a broken level, a close below the last low.

How to use it

01
Identify the market phase
In a trend RSI is a filter for pullbacks; in a range it gives signals at the range edges.
02
Watch for the exit from the zone
Not the move into 70 or 30, but the move back out.
03
Look for divergences on higher timeframes
On the 4-hour and daily charts they're more reliable than on minute charts.
04
Confirm with price
A level, a candlestick pattern, a break of structure. RSI alone isn't enough.

Common mistakes

Shorting every overbought reading

In a trend that's the fastest way to blow an account. Overbought in a trend is a sign of strength, not weakness.

Entering on a divergence right away

Without confirmation a divergence often keeps going while price runs further.

Changing the length for every trade

Everyone watches the standard RSI 14, so more participants react to it. Fitting parameters to history doesn't help in the future.

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