IB intermarket spread margin

[ADX_trader]

How to calcaulate this intermarket spread margin?

If I long 1 DAX and short 3 ESTX50 futures and carry it overnight.

 

[zzt]

go to eurex website and download their 'margin calculator' app. IB just charges the exchange margin.

 

[ids]

You can also use your paper trading account to find out an answer.