三十人(さんじゅうにん)

三十(さんじゅう) (thirty) + the counter 人(にん). Only the first three counts are irregular; everything from four upward simply adds にん.

Counting people

• 一人(ひとり): one person — irregular
• 二人(ふたり): two people — irregular
• 三人(さんにん): three people
• 四人(よにん): four people — よん shortens to よ
• 三十人(さんじゅうにん): thirty people

Common expressions

• 三十人(さんじゅうにん)学級(がっきゅう): a class of thirty, a common benchmark in Japanese education policy
• 定員(ていいん)三十人(さんじゅうにん): capacity of thirty
• 三十人(さんじゅうにん)程度(ていど): around thirty people