MQL5 → Pine Script v5: Conversion Guide

Each guide pairs equivalent code side by side — same logic, both languages — and ships a free, original, MIT-licensed template you can run today. Demo-test everything: translation bugs are cheaper on demo.

Side-by-side: the core translations — MQL5 → Pine Script v5

// MQL5: indicator handle + CopyBuffer
int atrHandle = iATR(_Symbol, PERIOD_H1, 14);
double atr[1];
CopyBuffer(atrHandle, 0, 0, 1, atr);
double atrNow = atr[0];

// Pine v5: one built-in call
atrNow = ta.atr(14)

// MQL5: modify the open position
double sl = NormalizeDouble(entry - atrNow * 2.0, _Digits);
trade.PositionModify(_Symbol, sl, tp);

// Pine v5: strategy engine handles exits
strategy.exit("X", stop=entry - atrNow * 2.0)

// MQL5: new-bar gate + handle
if(rsi[0] < 30 && rsi[1] >= 30)
   trade.Buy(0.10);

// Pine v5: executes on close by default
if ta.rsi(close, 14) < 30 and ta.rsi(close, 14)[1] >= 30
    strategy.entry("L", strategy.long)

Translation notes — MQL5 → Pine Script v5

• MQL5 runs on ticks; Pine strategies evaluate on bar close — results will differ even with identical logic.
• MQL5 position management (netting vs hedging) has no Pine equivalent: translate one position at a time.
• Translate indicator handles first, then order logic, then money management — in that order.

Download the templates — MQL5 → Pine Script v5

⬇️ pine-v5-strategy-template.pine (MIT) ⬇️ mql5-strategy-template.mq5 (MIT)

Reversing the trip? See the MT4 → MT5 guide for the MetaTrader side.