The first step in calculating forex profit is to measure the movement of the pair. For instance, you may be trading a dollar-based pair that moves three pips in your favor, or $0.30. Multiply that profit by your lot size and number of lots. If you're trading two standard-size lots, then that would be two lots times 100,000 units per lot times $0.30 profit (2 x 100,000 x 0.3 = $60,000). If you used leverage, you'll need to subtract what you borrowed from that amount to learn how much profit you'll get to pocket.