Margin is the face value of a position divided by the leverage applied to it. One standard lot of a pair trading at 1.0850 is $108,500 of face value, so at 1:50 it holds $2,170 and at 1:30 it holds $3,617. That money is not spent, it is held, and it comes back when the position closes. What matters is how much of the account is held at once: a book that ties up most of the balance has no room left for the next idea, and it sits close to the point where positions start being closed for you. Leverage on FFUNDED accounts follows the asset class and the plan phase, and every rate is published in the plan comparison. Exposure is capped separately, which the risk calculator shows.