Grace means undeserved favor. So tell me, are calvinists of the belief that they are favored ahead of time, before Jesus even died on the cross? That would mean God has these chosen people already in mind, that had to have Jesus die just for them...heck with everyone else who might have wanted the same undeserved favor. Does John 3:16 say that...no it says He loved the world.
I'm just one small person in this world and I believe in Jesus with all my heart...that is why I'm saved. Jesus promised He would give me undeserved favor because I'm a believer.