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RSI in practice: reading signals, a worked example and pitfalls

How traders use the RSI: overbought and oversold, trend filter and divergence. With a hypothetical worked example, a checklist and common mistakes.

Daytraders.nl redactie · April 18, 2026 · bijgewerkt October 10, 2026 · 6 min leestijd

In short

  • The RSI (Relative Strength Index) measures, on a scale of 0 to 100, how strongly the price has moved recently.
  • Readings above 70 are often called “overbought” and below 30 “oversold”. On their own they are not buy or sell signals.
  • In a strong trend the RSI can stay above 70 or below 30 for a long time.
  • Use the RSI together with trend, price levels, a stop-loss and a calculated position size.

This page shows how the RSI is used in practice. The calculation and advanced techniques are in the tutorial RSI deep dive: advanced techniques.

What problem does it help with?

After a fast rise or fall, a trader often wonders whether the move will continue or whether a pause or pullback is becoming more likely. The RSI gives a view on this because it compares recent gains and losses. Most trading platforms use 14 periods by default.

The RSI does not predict anything. It lags, because it is based on past prices. A high reading says the price rose strongly, not that it will fall.

How traders use it in practice

Overbought and oversold

In a market without a clear direction, some traders look for a return to the middle. An RSI below 30 may then point to a possible rebound, and an RSI above 70 to a possible pullback. This works worst in a strong trend, because the price keeps going.

The RSI as a trend filter

In an uptrend the RSI often stays between about 40 and 80. Some traders see a dip to 40-50 as a possible entry in the direction of the trend. In a downtrend they look at 20-60 instead. These are rules of thumb, not fixed limits. They differ per market and timeframe.

Divergence

In divergence the price makes a new low but the RSI makes a higher low (or the reverse for highs). It can point to fading momentum. It is a warning, not an entry signal. The price can keep going for a long time before anything changes, or never turn at all.

Worked example (hypothetical)

Two made-up examples to show the steps. Account: €10,000, maximum loss per trade 1% (€100).

Example 1: pullback in a rising trend

  • A share has been rising for weeks and is above its 50-day average. After a small dip the RSI is 38 and the price is €40.
  • A trader enters at €40. The stop-loss is at €38.50, below the last low. The risk is €1.50 per share.
  • Position size: €100 / €1.50 = about 66 shares (roughly €2,640).
  • Target: €43. That is €3 per share, so 2 times the risk.

Example 2: the RSI gives a false start

  • Another share is falling in a downtrend. The RSI is 28 (“oversold”). A trader buys at €25 with a stop-loss at €23.50 (risk €1.50, so 66 shares).
  • The price keeps falling and the RSI stays below 30 for weeks. The stop-loss is hit. The loss is about €100 plus costs, exactly as planned.

The second example shows why a stop-loss is needed. An “oversold” reading does not protect you from further falls.

Checklist before a trade

  1. Is the market trending or sideways? Does my use of the RSI fit that?
  2. Which RSI period and timeframe am I using, and did I choose them in advance?
  3. Does the price confirm the signal, for example through a support level or a reversal candle?
  4. Where is my stop-loss, and is the risk at most 1% (or my own limit)?
  5. How large is the position, calculated from the stop distance?
  6. Are the costs (spread, commission) small relative to the target?
  7. Is news scheduled that could make the price jump?

Common mistakes

  • Automatically selling above 70 or buying below 30. In a strong trend this is costly.
  • Treating divergence as a fixed signal. It is a warning, not a guarantee.
  • Using the RSI alone. Without the context of trend and price levels it often gives false signals.
  • Adjusting settings until the past fits. This creates false certainty.
  • Not limiting losses. Without a stop-loss, one trade can cost a large part of your account.

Risk management

Decide your maximum loss per trade in advance and place the stop-loss at a logical level, not at an amount that happens to fit. Then calculate the position size:

In high volatility the price can jump past your stop-loss, so the loss becomes larger than planned.

Costs

Trading costs matter most in short trades. The spread is the difference between the buy and sell price. With a small expected gain, the spread can eat a large part of it, especially if you enter and exit often. Compare provider costs on Compare brokers.

Summary

The RSI helps you judge the recent strength of a price. It gives no certainty, it lags and it works differently in a trend than in a sideways market. Use it as one of several aids, with a stop-loss and a calculated position size. The full explanation is in the tutorial RSI deep dive: advanced techniques.

This is educational information, not investment advice. Trading involves risk and you can lose all or part of your capital.