Door handing is required for some lever handles produced by some manufacturers, and you will need this before you can place an online order for handed levers.  (If handing is not asked for, it is not required; the levers are reversible. In most cases, handing is only required for single dummy levers and for handlesets.) Determining the handing of a door is quite simple; however, it is probably the one thing that causes the most confusion and errors when ordering door hardware.  There are left-handed levers and right-handed levers. To determine the appropriate handing for your door, look at the hinges from the exterior side of the door.

Right Handed:  If the hinges are on the right, you need a right-handed lever.

Left Handed:  If the hinges are on the left, you need a left-handed lever.

Unless you are ordering mortise locks, the swing of the door does not matter. It can swing in or out.