Your available funds are equal to that part of your account’s Net Asset Value that is not being used as margin requirement to maintain open positions. These funds are free to use to open another position, transfer to another sub-account or withdraw. You can find this figure in the ‘Margin Available’ field in the Account Summary section of your trading dashboard on the OANDA trading platform. So let’s say your account balance is $550 and your unrealised P/L is -$45. Your account’s NAV is $550 – $45 = $505. And let’s say you have two open positions with a cumulative margin requirement of $300. Your margin available would be $505 (NAV) – $300 (margin requirement) = $205. In this scenario, you would be able to open a new position if the margin needed to open that position was less than $205.