Stand in front of the closed door as if you are about to enter the home or room.
Push the door open. If the door does not push open, pull it open.
Look at the way the door swings. If it swings toward you, it is an out-swing door. Doors that swing into a home or room are in-swing doors.
Stand outside the door. Close the door. Turn around so your back faces the door hinges.
Hold your arms out straight in front of yourself.
Look at the position of your hands. If your left hand looks closer to the door handle or doorknob than your right hand, the door is left-handed. The door is right-handed if your right hand is closer to the door's handle or knob.