Blunt bangs are typically cut straight across from the outside corner of each eye. "You can also make [fringe] heavy or soft," John Barrett stylist Dhiran Mistry explained. "You can make it softer by cutting more into it and using a smaller section, so it's less hair falling in the face."
Because the horizontal line with these bangs tends to span the entire forehead, double check with your stylist that the cut will accentuate — not shorten — your face shape.