What scale do you use to measure how spicy a chili pepper is?

The Scoville scale is used to measure the pungency (spicy heat) of chili peppers. It is named after its creator, Wilbur Scoville, who developed it in 1912. The Scoville scale is based on the amount of capsaicin, the chemical compound that gives chili peppers their heat, in a given pepper. The scale is measured in Scoville Heat Units (SHU), with higher SHU values indicating greater pungency.