int734
11 Apr 2015, 15:24

RE:

USD / XXX:  

           margin =  contract size / leverage;

XXX / USD:

           margin = current price * contract size / leverage;

XXX / YYY:

   a). (EUR/GBP, AUD/NZD ...)

           margin = crossPrice  * currentPrice(XXX/USD) * contractSize / leverage;

   b). (CAD/CHF, CHF/JPY ....)

           margin = crossPrice / currentPrice(USD/XXX)  * contractSize / leverage;