MT5 Cash Risk Probe - Read-Only Sizing

Related: Risk of Ruin Calculator: Understand Your Trading Account's Vulnerability - another powerful script for MetaTrader 5 traders.

MT5 Cash Risk Probe is a read-only MetaTrader 5 script for checking one cash-risk sizing boundary before order logic is implemented. It does not send, modify or close any order. The script calls OrderCalcProfit() for a hypothetical one-lot trade between the chosen entry and stop. This returns the price-loss estimate in the terminal account deposit currency. The script subtracts an explicit cash reserve for fees or slippage, divides the remaining budget by the one-lot loss, floors the result to the symbol volume grid and recalculates the final loss. Every successful report includes the symbol, side, account currency, entry, stop, cash budget, reserve, one-lot loss, raw volume, final volume, estimated price loss, estimated total, broker minimum/maximum/step/limit, tick size and order_sent=false. Inputs - InpSymbol — symbol to inspect; blank uses the current chart symbol. - InpSide — hypothetical BUY or SELL direction. - InpEntryPrice — explicit entry; zero uses current Ask for BUY or Bid for SELL. - InpStopPrice — required hypothetical stop price. A BUY stop must be below entry; a SELL stop must be above entry. - InpRiskCash — maximum cash budget in the reported account deposit currency. - InpCashCostReserve — explicit cash amount reserved for commission, fees or slippage assumptions. It must be nonnegative and below the cash budget. - InpRunSelfTests — runs five deterministic volume-floor boundary tests at startup. Deterministic checks The startup tests cover ordinary 0.01-step flooring, below-minimum rejection, maximum-volume capping, a 0.10 step and a grid whose minimum is not an integer multiple of its step. The broker-dependent calculation blocks missing or wrong-side stops, invalid cash values, unavailable ticks, invalid volume metadata, failed profit calculation and a budget below minimum volume. Result interpretation PASS means the recalculated price loss plus the explicit cash reserve does not exceed the entered cash budget. BLOCKED means a required input, terminal state, broker property or calculation boundary could not be validated safely. A block is intentional: the script does not guess missing values. Installation Copy SCA_MT5CashRiskProbe.mq5 to MQL5\Scripts\StratCoreAlpha\. Compile it in MetaEditor. Run it on an MT5 chart and review the chart comment and Experts log. A connected terminal is required for broker/account-currency profit calculation. Limitations This is engineering diagnostic code, not trading advice or a performance claim. PASS does not guarantee fill price, commission, slippage, margin availability, trade-server acceptance or profit. The script does not aggregate portfolio exposure and does not send orders.

Also recommended: Weekend Gap Risk Assessment for Prop Firm Trading - similar script with strong performance on MetaTrader 5.

You may also like: Risk-Based Lot Size Calculator Script with On-Chart Panel - excellent alternative for script users on MetaTrader 5.

#property copyright "RobotFX"
#property link "https://robotfx.org"
#property version   "1.00"
#property description "This code is educational. Feel free to use, modify and upgrade as you wish. Visit ROBOTFX.ORG for professional trading tools"
#property script_show_inputs
enum ENUM_SCA_ORDER_SIDE
  {
   SCA_ORDER_BUY=0,
   SCA_ORDER_SELL=1
  };

.......

• This tool is provided for educational and testing purposes only.
• Past performance does not guarantee future results.
• Trading involves substantial risk of loss. Use on a demo account first.
• Results may vary depending on market conditions, broker, and settings.
• We recommend thorough backtesting and forward testing before using with real funds.