Door handing is relatively simple if you follow a few basic steps.
1] Most handed hardware requires only LH or RH information to order.
This includes door closers, pivots and most anything that requires a key.
Simply stand on the side of the door that you push to open.
If the hinges are on the right it is a right hand (RH) door.
If the hinges are on the left it is a left hand (LH) door.
An even easier method –> stand inside the door frame with your back to the hinges. If the door opens to the left side you have a LH door. If it opens to the right, you have a RH door.