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// RSI.MQ5
What is the RSI indicator?
Relative Strength Index (RSI)Momentum
Measures the strength of recent price moves and maps it to an easy-to-compare 0–100 scale.
Three reasons Relative Strength Index is still used after decades.
A fixed scale
Always between 0 and 100, so it can be compared across currency pairs and timeframes.
Catches divergence
Price makes a higher high while RSI does not — a sign that momentum is running out.
Early warning
It reacts before price reverses, so use it to prepare, not to enter blindly.
// READING_SIGNALS
How to read Relative Strength Index signals
How Relative Strength Index (RSI) produces its number, and what each shape on the chart means.
Formula and how it works
RSI compares the average gain and the average loss over N periods using Wilder smoothing. The formula is RSI = 100 − 100/(1 + AvgGain/AvgLoss). Values above 70 suggest overbought, below 30 suggest oversold.
How to use it in an EA
Look for divergence between RSI and price to warn of a reversal; or look to buy when RSI leaves the oversold zone (30) and sell when it leaves the overbought zone (70).
Fits when
The market oscillates around a price zone, where overextended moves tend to get pulled back.
Struggles when
A strong one-way trend. RSI stays above 70 for many sessions while price keeps rising, and every counter-trend sell loses.
RSI above 70Overbought zone. In a strong uptrend RSI can stay here for a long time — it is not a sell order.
CONCEPT ILLUSTRATION · RSI above 70RSI enters the zone above 70; wait for a cross down to confirm · RSI 14 · 70 / 30RSI70 overbought30 oversold
RSI below 30Oversold zone, read the same way in the opposite direction.
CONCEPT ILLUSTRATION · RSI below 30RSI drops below 30; wait for a cross up to confirm · RSI 14 · 70 / 30RSI70 overbought30 oversold
RSI leaves the extreme zoneThis is the signal usually used, not the moment it touches the zone.
CONCEPT ILLUSTRATION · RSI leaves the extreme zoneRSI crosses back through the threshold → confirmation signal · RSI 14 · 70 / 30RSI7030
Price makes a new high, RSI does notBearish divergence — momentum is not keeping up with price.
CONCEPT ILLUSTRATION · Price makes a new high, RSI does notPrice makes a new high, RSI does not confirm · 14PriceRSI
Common mistakes
Treating 70 and 30 as buy and sell orders. They are thresholds describing a state, not entry signals.
// PARAMETERS
Recommended MT5 parameters for Relative Strength Index
Default values of the sample file; test them for your market and timeframe.
Parameter
Description
InpPeriod
Period for the average gain/loss (default 14).
// INSTALL
Put the indicator into MetaTrader 5
Four steps, no software needed besides MT5.
01Download the .mq5 file
Click the download button above; the file saves to your computer under the indicator's name.
02Open the data folder
In MetaTrader 5 choose File → Open Data Folder, then go to MQL5/Indicators.
03Compile
Open the file in MetaEditor and click Compile. No errors means the indicator is ready.
04Drag it onto the chart
Go back to MT5, refresh the Navigator and drag the indicator onto the price chart.
📄 rsi.mq5
DinexSpace wrote this file from the indicator's public formula, not from any commercial source. You are free to edit and reuse it.
// THE_DIFFERENCE
How it differs from MetaTrader 5's built-in indicator
The short answer: the formula is not different. What differs is what you can do with it.
Relative Strength Index here gives exactly the same number as MetaTrader 5's built-in version — on purpose. The four points below are what differs, and all four can be read from the very rsi.mq5 you download.
Calls a built-in indicator
No — the calculation sits in OnCalculate and can be copied straight into an EA
External libraries
Not a single #import declaration
Code length
60 lines · 1 input parameters
How it draws
A separate window below the price chart · calculated incrementally, does not redraw the past
Double confirmation at the band edge. When price touches the lower band and RSI is also below 30, two separate measures both say price has strayed far.
Note
Both indicators measure deviation from an average, so they are not truly independent — do not treat them as two separate pieces of evidence.
Frequently asked questions about Relative Strength Index
Is RSI above 70 a sell signal?+
No. It describes a state: price has risen strongly relative to its own recent history. In a healthy uptrend, RSI can stay above 70 for dozens of sessions while price keeps rising. The signal usually used is when RSI LEAVES the extreme zone, not when it touches it.
Is RSI divergence reliable?+
Divergence is a warning that momentum is running out, not a reversal order. It can appear many times before price actually turns. Use it to tighten risk or take partial profit, and wait for price to confirm before entering the other way.
Does Relative Strength Index on this page use real or simulated data?+
The chart on this page uses a deterministic simulated candle series; it is not market prices or trading results.
Using Relative Strength Index in an EA, and further reading
An indicator draws signals, but when to enter, where to stop out and how much to risk are still your set of rules. Send those rules and DinexSpace builds them into an EA.
