This ProBuilder script is designed to calculate and display the margin requirements for opening positions under different conditions according to ESMA rules. It considers scenarios with no stop, a non-guaranteed stop, and a guaranteed stop. The script uses basic arithmetic operations, conditional logic, and text drawing functions to display the results on the chart.

DEFPARAM calculateonlastbars = 1
Size = 1 //Your Trade Size
MarginFactor = 5 //Margin Factor in %
SlippageFactor = 50 //Slippage Factor in %
StopDistance = 100 //Stop Distance in pips
LimitedRiskPremium = 1 //Limited Risk Premium

NoStopMargin =(Size * close) * (MarginFactor / 100)
NoStopMargin = Round(NoStopMargin * 100) / 100

StopMargin = (Min((NoStopMargin * (Slippagefactor / 100)) + (Size * StopDistance),NoStopMargin))
StopMargin = Round(StopMargin * 100) / 100

GStopMargin = (Size * StopDistance) + (Size * LimitedRiskPremium)
GStopMargin = Round(GStopMargin * 100) / 100

DRAWTEXT("No Stop Margin #nostopmargin#",barindex,0,SansSerif,Bold,16)coloured(0,0,255)
DRAWTEXT("Stop Margin #stopmargin#",barindex,-0.5,SansSerif,Bold,16)coloured(0,0,255)
DRAWTEXT("Guaranteed Stop Margin #gstopmargin#",barindex,-1,SansSerif,Bold,16)coloured(0,0,255)

return 0.5,-1.5

Explanation of the code:

• DEFPARAM calculateonlastbars = 1: This line sets the indicator to calculate only on the last bar to optimize performance.
• Variable Initialization: Variables such as Size, MarginFactor, SlippageFactor, StopDistance, and LimitedRiskPremium are initialized. These variables are used to calculate the margin requirements based on the user’s input and the current market price.
• No Stop Margin Calculation: Calculates the margin required if no stop loss is used. The result is rounded to two decimal places.
• Stop Margin Calculation: Calculates the margin required with a non-guaranteed stop. It considers the worst-case slippage scenario and compares it with the no stop scenario, taking the minimum of the two.
• Guaranteed Stop Margin Calculation: Calculates the margin required with a guaranteed stop, adding a limited risk premium to the stop distance cost.
• Drawing Text on Chart: Uses DRAWTEXT function to display the calculated margins on the chart. Each margin type is displayed at a different vertical position with specific styling and color.

This script is a practical tool for traders who need to quickly assess the margin requirements for different trading setups directly on their charts.