Cross margin uses the entire balance of the trading wallet as collateral for the position. This is in contrast to isolated margin, where the position is independent and only the collateral used to open the position is at risk.
The effective leverage is calculated by dividing the value of open positions by the total available equity of the account. In other words, the effective leverage is the amount of capital used compared to the amount in the futures trading wallet.
You can calculate the effective leverage for positions with the following formulae:
Multi-Collateral Cross Margin:
Sum of All Position’s Value at Entry / (USD Collateral Value - Isolated Initial Margin + Unrealised Profit/Loss* Isolated & Cross)
Multi-Collateral Isolated Margin:
(Position Value at Entry in USD) / (Isolated Margin in USD +/- Isolated Position's Profit or Loss*)
Note that when opening more than one position on different pairs with Multi-Collateral Cross Margin your collateral is shared between those positions and the effective leverage level will be higher for both.
For the “Position Size in USD” portion of the calculation you can add the value of two or more positions together to calculate the net result of effective leverage that multiple positions have on your account.
* For Multi-Collateral contracts, haircut applies to non-USD unrealised Profit and Loss