Question: What is "used margin"? How can I calculate this"
Used Margin shows the amount of equity in an account that is used by the currently open positions.
In the case where used margin is equal to equity, this indicates maximum leverage usage in the account.
Used Margin = Net Exposure / Leverage
“Equity – Used Margin” is the “Free Margin” which indicates the amount you can use for further trading in the account.
*In case there is no enough free margin in your account, any pending orders that cannot be opened will be cancelled automatically.