A horse kick can deliver an impact force of up to approximately 8,700 Newtons (about 2,000 pounds) of force, which is equivalent to around 2,000 pounds per square inch (PSI). This force is strong enough to break bones, dent metal, or cause serious injury and is more than double the punch force of a heavyweight boxer. The strength of a horse kick comes from its size, muscle mass, speed, and the type of kick. Such a powerful strike is comparable to the force of a small car collision and can potentially be fatal if it hits a vulnerable area like the head.