noun
popularity rating; popularity stakes
A measure or ranking of how popular someone or something is, often used in contexts like polls, surveys, or entertainment rankings.
このアイドルの人気度は急上昇している。
This idol's popularity rating is rising rapidly.
各候補者の人気度を調査した。
We surveyed the popularity ratings of each candidate.
支持率 is an approval rating or support rate, often used in political contexts, whereas 人気度 is broader and can apply to entertainment, products, etc.
Compound of 人気 (にんき, 'popularity') and 度 (ど, 'degree'). A straightforward modern formation.