It clocked in at just under 2.7 million Scoville Heat Units, the scale used to rank how spicy peppers are. The Reaper averaged 1.64 million SHU and peaked at about 2.2 million SHU. For comparison, a jalapeño registers about 2,500 to 8,000 SHU and cayenne pepper is 30,000 to 50,000 SHU.