Calculate P&L from entry price, exit price, and lot size
Profit or loss is calculated from the price difference between entry and exit, multiplied by position size. The formula depends on whether you're buying or selling.
Buy 1 lot EUR/USD at 1.0850, sell at 1.0900 = 50 pips × $10/pip = $500 profit. The same trade with 0.1 lots = $50 profit.