What is an RSI Strategy? A Simple Guide

Quick Answer

An RSI strategy uses the Relative Strength Index, a momentum indicator scaled from 0 to 100, to judge whether a stock is overbought or oversold. Readings above 70 suggest overbought, below 30 oversold. Traders use it to time entries, spot divergences, and gauge momentum strength.

The Relative Strength Index measures the speed and size of recent price moves on a simple 0 to 100 scale. Trading strategies built on it try to catch turns and gauge momentum.

This guide explains how the RSI is read and the main ways traders build a strategy around it.

Key Takeaways

• RSI is a momentum indicator scaled 0 to 100.
• Above 70 is often called overbought.
• Below 30 is often called oversold.
• Divergence can warn of a weakening trend.
• RSI works best combined with other signals.

How is the RSI read?

The RSI moves between 0 and 100 based on recent gains versus losses. A high reading means recent moves have been strongly upward, a low reading strongly downward. The common thresholds are 70 and 30: above 70 the stock is called overbought, below 30 oversold, hinting at a possible pause or reversal.

How do traders use it for entries?

A basic strategy buys when the RSI falls below 30 and turns back up, treating oversold as a chance for a bounce, and sells or exits when it rises above 70. This works best in range-bound markets. In strong trends, the RSI can stay overbought or oversold for a long time, so the signal is less reliable.

What is RSI divergence?

Divergence is when the price makes a new high or low but the RSI does not follow. If the price makes a higher high while the RSI makes a lower high, momentum is weakening even as the price rises, which can warn of a coming reversal. Divergence is one of the more valued RSI signals.

Why combine RSI with other tools?

On its own, the RSI gives false signals, especially in trends where overbought can persist. Combining it with trend direction, support and resistance, or volume filters out weak signals. Most traders treat the RSI as one input among several rather than a standalone trigger.

What are the pitfalls of using RSI?

The Relative Strength Index is a popular momentum tool, but a common mistake is treating overbought or oversold readings as automatic signals to sell or buy. In a strong trend, RSI can stay overbought or oversold for a long time while the price keeps moving, trapping traders who fade it too early. RSI works better as one input among several, especially when confirmed by price action, rather than as a standalone trigger acted on mechanically.

How is RSI best used?

RSI is most useful when combined with the broader trend and other evidence. Many traders use it to spot divergences, where price and RSI disagree, hinting at a possible turn, or to confirm entries in the direction of the trend rather than against it. Adjusting how overbought and oversold levels are interpreted in trending versus ranging markets also helps. Used thoughtfully as part of a wider plan, RSI adds insight, but relied on alone it can mislead.

Trading and intraday strategies carry a high risk of loss and are not suitable for every investor. This article is educational and is not a recommendation to trade.

Frequently Asked Questions