RSI

• The RSI (Relative Strength Index) measures the speed and magnitude of recent price changes, producing a single value between 0 and 100 that indicates whether a market is gaining or losing momentum.
• Readings above 70 suggest overbought conditions. Readings below 30 suggest oversold conditions. Neither is an automatic signal to trade.
• RSI divergence — when price makes a new high or low that the RSI does not confirm — is one of the most reliable early warnings of fading momentum.

The RSI, or Relative Strength Index, is a momentum oscillator that measures the speed and size of recent price changes. It produces a single reading on a scale from 0 to 100 and updates with every new candle. High readings indicate that recent gains have been consistently strong. Low readings indicate that recent losses have dominated.

If you are new to reading technical indicators on a chart, start with Introduction to Charts before continuing.

Developed by J. Welles Wilder in 1978, the RSI was designed to answer a specific question: is the current price move being driven by genuine momentum, or is the market running out of energy? That question matters because price can continue in one direction for some time after the underlying force behind the move has already started to fade.

The RSI does not show you where price is going. It shows you how strong the current move is relative to recent history. Used alone it is a partial picture. Used alongside structure, moving averages, and candlestick patterns, it becomes a meaningful filter.

The RSI compares the average size of recent up closes to the average size of recent down closes over a default period of 14 sessions. The result is expressed as a number between 0 and 100. The 14 period setting is the most widely used, but it can be adjusted. A shorter period such as 9 produces a more sensitive line that reacts faster to price changes. A longer period such as 21 smooths the signals and suits traders who prefer fewer, cleaner readings.

A reading of 100 would mean every session in the period closed higher than the one before. A reading of 0 would mean every session closed lower. In practice the RSI sits somewhere in between and fluctuates as new price data comes in.

Overbought and Oversold Levels

• When the RSI climbs above 70, the market is considered overbought. Recent gains have been strong and sustained. The reading warns that momentum may be due for a pause or reversal.
• When the RSI falls below 30, the market is considered oversold. Recent losses have been heavy. The reading suggests selling momentum may be exhausting.

These levels are reference points, not instructions. A market can remain overbought for an extended period during a strong uptrend and continue higher throughout. Acting on every cross above 70 produces a significant number of false signals. The level tells you to pay closer attention, not to act immediately.

The Centreline

The 50 level acts as a momentum dividing line. When the RSI is above 50, buyers are in control of recent price action. When it is below 50, sellers have the upper hand. Many professional traders pay more attention to the 50 level than to the 70 and 30 extremes because it more accurately reflects the overall state of trend momentum rather than short-term overextension.

RSI in Trending Markets

This is where most beginners go wrong. In a strong uptrend, the RSI often stays above 50 throughout. Pullbacks that bring the RSI into the 40 to 50 zone are not warnings to exit. They are potential re-entry opportunities in the direction of the trend. In a strong downtrend, the RSI tends to stay below 50 and rallies that lift it into the 50 to 60 zone often represent selling opportunities rather than reversal signals.

In ranging markets the picture is different. With no dominant trend direction, the RSI swings more freely between its extremes and the overbought and oversold levels carry considerably more weight. A reading below 30 at the lower boundary of a range and above 70 at the upper boundary are among the cleaner signals the indicator produces. Ranging conditions are where the RSI is genuinely in its element.

RSI Divergence

• Bullish divergence: Price makes a lower low, but the RSI makes a higher low. Price is still falling, but the selling force behind each move is weakening. This is an early warning that the downtrend may be losing energy.
• Bearish divergence: Price makes a higher high, but the RSI makes a lower high. Price is still rising, but fewer buyers are pushing it. The rally is becoming thinner.

Divergence on its own does not trigger a trade. It is a signal to look more carefully. When divergence appears at a key support or resistance level, the combined picture becomes considerably more compelling.

Failure Swings

A more specific version of divergence worth understanding. A bullish failure swing occurs when the RSI falls below 30, recovers above 30, pulls back without returning to 30, then breaks above its prior recovery high. Price does not need to confirm the move for the signal to be valid. The RSI is signalling its own structural shift. Bearish failure swings work in reverse. These are considered stronger signals than standard divergence because the RSI is generating the pattern independently of price.

RSI Trendline Breaks

The RSI is not just a number. It is a line, and it forms its own structure. Trendlines can be drawn directly on the RSI, connecting its swing highs or lows just as you would on a price chart. When the RSI breaks its own trendline, it often signals that momentum is shifting before the price chart has confirmed it. This gives an earlier read on developing changes in direction.

EUR/USD produced a clear RSI divergence signal ahead of its correction from the July 2025 highs. Here is how the divergence developed on the daily chart:

EUR/USD made a high around April 21st at approximately 1.1572 then extended further to 1.1832 on July 01. Despite the higher price on July 01, the RSI registered a notably lower reading. Price was stronger. Momentum was not.

That divergence preceded a sustained decline. The indicator did not predict the size of the fall. What it told you was that the momentum behind the rally was no longer what it had been at the first peak. A trader watching the RSI alongside price would have noted the weakening force behind the second attempt and treated the second high with considerably more caution.

Most traders focus on price direction. The RSI adds a second dimension: the force behind the direction. A market moving higher on strong RSI momentum behaves differently from one grinding higher while the RSI fades. The first suggests continuation. The second suggests caution.

RSI works best with structure. The strongest signals the indicator produces do not come from the RSI in isolation. They come when the RSI reading aligns with a meaningful price level. An oversold reading at tested support carries far more weight than the same reading appearing in open price space with no structural reference. An overbought reading at a well-established resistance level, accompanied by a bearish candlestick pattern, is a different proposition entirely from the same reading mid-trend with no context around it. Location changes everything. The RSI confirms what structure suggests.

This matters most at the moments when you are deciding whether to enter, hold, or exit a trade. An RSI reading above 70 near resistance, combined with a bearish candlestick pattern, gives you more reason to stay out of a long or to tighten a stop. An oversold RSI at a tested support level adds weight to an existing setup.

The RSI also connects directly to how you manage risk on open positions. A trade entered near support with a rising RSI has momentum behind it. The same trade entered with a falling RSI at the same level has less. That difference should affect how you size the position and where you place the stop. For a fuller picture of how to combine momentum signals with a trend direction tool in a single framework, read MACD alongside this topic.

1. The RSI measures the speed and magnitude of recent price changes on a scale from 0 to 100. Readings above 70 suggest overbought conditions. Readings below 30 suggest oversold conditions. Neither is an automatic trading signal.
2. The 50 level divides bullish from bearish momentum and is where many professionals focus their attention. In trending markets, the 40 to 50 zone acts as a pullback re-entry area. In ranging markets, the 70 and 30 extremes carry the most weight. RSI trendline breaks and failure swings provide early structural signals before price confirms.
3. RSI works best with structure. The same reading at a key price level and at a random point in open space are entirely different signals. Context is what gives the RSI its value.

You now have a measure of momentum alongside your structure and trend tools. The next step is learning how to combine momentum with trend direction in a single indicator framework.

• [MACD] – Learn how the Moving Average Convergence Divergence indicator combines trend direction and momentum into one tool, and how to use it alongside the RSI for high-probability setups.
• [Moving Averages] – Revisit how moving averages and RSI readings work together to confirm trade setups and filter entries in the direction of the prevailing trend.

Open a daily chart on any major currency pair and add the RSI with the default 14 period setting. Look back over the past three months and identify at least one moment where the RSI crossed above 70 or below 30. Note whether that crossing coincided with a key price level. Then look for any divergence between price highs or lows and the corresponding RSI readings. Finally, try drawing a trendline directly on the RSI itself and see if any breaks preceded changes in price direction. Practice reading RSI signals on a demo account before using them to inform live trading decisions.