How much does it hurt when a paintball hits you?

Generally, it will depend on a few factors such as: Velocity of the paintball, How much clothing is worn, and what part of the body it is. When you get hit in the stomach with a paintball going the standard rate of speed 280-300 Feet Per Second, it feels like a firm pinch or a snap with a large rubber band, keep in mind this is wearing a T-Shirt. If you get hit in the arm, it feels like a semi-firm pinch.