Married filing taxes jointly with 4 kids ?

im filing married joint we made an estimated 41,000 and we have 4 kids will we qualify for eic and will we get eic for all 4 kids as apposed to filing head of household u only get eic for 2 kids and the other 2 are used as exemptions?...any way any 1 can give me an estimate on how much of a return we might get?