How to Add RSI on MT4

The Relative Strength Index, commonly known as RSI, is one of the most widely-used oscillators in technical analysis. It measures the magnitude of recent price changes to evaluate whether an instrument is potentially overbought or oversold, and it is built into MetaTrader 4 as a standard indicator that can be applied to any chart in a few steps.

This guide explains what RSI is, how to add it to a chart on MT4, how to configure the period and overbought/oversold levels, how to customise the appearance, and the most common ways traders interpret RSI readings. The same indicator is available on MT4 mobile with a similar configuration flow but a more limited styling interface.

What is the RSI

The Relative Strength Index was introduced by J. Welles Wilder Jr. in 1978 in his book New Concepts in Technical Trading Systems. It is a momentum oscillator that compares the size of recent up-closes to the size of recent down-closes over a defined lookback period, and produces a value between 0 and 100.

The underlying calculation is based on the ratio of average gains to average losses. The formula is RS = average gain / average loss over the chosen period, and RSI = 100 - (100 / (1 + RS)). The result is bounded between 0 and 100, with higher values reflecting stronger recent up-momentum and lower values reflecting stronger recent down-momentum.

RSI displays in a separate subwindow beneath the price chart in MT4. It is not an overlay on the price itself, which is consistent with how oscillators are typically shown on the platform.

How to Add the RSI to MT4

There are two standard ways to add the RSI to an MT4 chart. Both open the same parameter dialog.

The Insert menu method: from the menu bar at the top of the platform, go to Insert > Indicators > Oscillators > Relative Strength Index. The parameter dialog opens immediately.

The Navigator method: press Ctrl+N to open the Navigator window if it is not already visible. Expand the Indicators node, then the Oscillators sub-node, and locate Relative Strength Index. Click and drag the indicator onto the chart where you want it applied. The parameter dialog opens on drop.

Either method applies the indicator to the active chart. To apply RSI to multiple charts, repeat the process for each chart, or save a chart template that includes the indicator and apply that template to other charts.

Configuring RSI Parameters

The parameter dialog has several tabs. The Parameters tab is where you set the core RSI settings.

Period: this is the lookback length used to calculate the average gains and losses. Wilder's original default is 14, and this is what MT4 uses as the default. Some traders use shorter periods (such as 7 or 9) for more reactive readings, or longer periods (such as 21 or 25) for smoother readings. There is no single correct answer, and the right period depends on the timeframe of the chart and the trader's preference.

Apply to: this determines which price field the RSI is calculated from. The default is Close, which is the standard convention. Other options include Open, High, Low, Median Price ((High + Low) / 2), Typical Price ((High + Low + Close) / 3), and Weighted Close ((High + Low + 2 x Close) / 4).

Fixed Minimum and Fixed Maximum: these set the boundaries of the RSI subwindow display. The defaults are 0 and 100, which match the natural range of the RSI calculation and should generally be left as they are.

Customising the Appearance and Levels

The Style tab controls how the RSI line is drawn. You can change the colour, line thickness, and line style (solid, dashed, dotted, dash-dot, dash-dot-dot). Choose a colour that contrasts with your chart background for readability.

The Levels tab is where you add horizontal reference lines inside the RSI subwindow. To add a level, click Add, then enter the value (for example, 70 for an overbought reference, 30 for an oversold reference) and choose a colour and style. Common choices are 70 and 30 (Wilder's original thresholds) or 80 and 20 (a stricter pair some traders prefer for more selective signals). You can also add a level at 50 if you want to visualise the centreline.

The Visualisation tab lets you select which timeframes the indicator is displayed on, in case you want it visible only on certain timeframes.

After configuring the settings, click OK to apply. The RSI then plots in its subwindow with any reference lines you have added.

Reading the RSI

RSI values are typically interpreted in a few common ways. The following are descriptions of common usage, not advice.

Overbought and oversold thresholds: readings above 70 are often described as overbought, and readings below 30 as oversold. The interpretation is that recent momentum has been strongly to one side and that a pause or reversal may be possible. In strong trends, however, RSI can stay above 70 or below 30 for extended periods, so these thresholds are not signals on their own.

Divergence: if price makes a new high while RSI fails to make a new high (bearish divergence), or price makes a new low while RSI fails to make a new low (bullish divergence), some traders take this as a sign that the underlying momentum behind the move is weakening.

Centreline (50) crosses: a move of RSI above 50 is sometimes described as bullish momentum, and a move below 50 as bearish momentum. Used in trend-following contexts.

Failure swings: Wilder described patterns within the RSI line itself (such as RSI making a lower high after touching the overbought zone, then breaking a prior swing low in the indicator) as more advanced signal patterns.

None of these readings predict future price. They describe what recent momentum has done and where it sits relative to historical ranges.

Editing or Removing the RSI

To edit RSI after it is applied, right-click on the RSI line in the subwindow and select Properties (or double-click the line). The parameter dialog reopens, and any changes apply after you click OK.

To remove RSI, right-click the line and select Delete Indicator. Alternatively, open the Indicators List via Charts > Indicators List, select Relative Strength Index from the list, and click Delete. To remove all indicators from the chart in one step, use Charts > Indicators List > Delete All.

RSI on Mobile

The MT4 mobile app for iOS and Android includes the RSI as one of its 30 built-in indicators. To add it on mobile, open the chart, tap the f symbol (indicators icon) or the chart settings menu, locate Relative Strength Index in the oscillators category, and tap to add. The mobile app exposes the Period parameter and the Apply to field with the same defaults as the desktop. Styling options on mobile are more limited than on desktop, typically allowing colour and line style adjustments only.

Practical Considerations

RSI is a lagging indicator by definition: it summarises what recent prices have done. It always reacts after the price has moved, so the timing of any signal it produces is necessarily slightly behind the actual price action.

Timeframe context matters. RSI(14) on a 4-hour chart is calculating its values from 14 four-hour bars, which is 56 hours of data. RSI(14) on a 5-minute chart is 70 minutes of data. The same indicator on the same instrument can give different readings on different timeframes, and any interpretation should be made with that context in mind.

In strong trending markets, RSI can stay in the overbought or oversold zone for long periods. Acting on an overbought reading during a strong uptrend, for example, can mean fighting the trend. Many traders pair RSI with other tools such as moving averages, trendlines, or price-action structures to provide additional context.

Different periods produce noticeably different RSI behaviour. A shorter period generates more reactive readings with more frequent zone touches, while a longer period generates smoother readings with fewer zone touches. There is no universally correct setting.

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