CFD Indices and Oil swap calculations follows:

Lots x Swap Long or Short in Margin Currency

Note: the swap for CFD Indices represents a currency value according to the margin currency of the CFD Index in question. As an example, if you have a short position of 2 lots (2 contracts) of US500 and the swap (which is in fact a combination of financing fees + dividends) is -0.13 then:

2 lots x -0.13 USD = -0.26 USD.

This will also be converted into your account currency automatically. 

Note: triple swap charge takes place on Friday for CFD Indices and Energies in MT4. The dividend component in the swap is not tripled, only the financing fee.