Summary

Michael Stevens (Vsauce) records the steepest forehead on the wiki at 49.6°, while John F. Kennedy sits at the flattest end at 4.0°. Mark Ruffalo's Browridge Inclination Angle, which measures forehead slant as influenced by brow projection, comes in at 19.8° and scores 10.0, inside its ideal range of 15.0 to 22.0°. That value is higher than 45% of the men on the wiki, and 40% of them also measure inside this range. His closest matches are Chris Carmack and PopularMMOs, both at 19.8°, with Casey Neistat just behind at 19.9°. For more of his profile, see Mark's Nasofrontal Angle and Mark's Upper Forehead Slope.