Use the, calculate button. How This Tool Works, this calculation follows the following formula: (Closing Rate - Opening Rate) * (Closing"/home currency) * Units. Oanda Japan., Ltd. Commodity Futures Trading Commission and is a member of the. Oanda Europe Limited is a company registered in England number 7110087, and has its registered office at Floor 9a, Tower 42, 25 Old Broad St, London EC2N 1HQ. The information is anonymous (i.e. The difference (bottom line) is net income (profit).