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Where can I find a clean, reliable calculator to check margin requirements before submitting an order?

Margin calculation is the one I never skip because getting it wrong is how accounts get wiped out on a volatile move. I want to know exactly how much of my free margin will be locked up before I open the position, not after. https://roboforex.com/beginners/start/profit-and-loss-calculator/forex/ shows the margin requirement clearly based on the lot size and leverage you input and it is fast enough to use in real time when I am evaluating whether I have sufficient buffer to add a position without exposing myself to a margin call if the trade moves against me initially.