Welcome to White Rabbit Japan!
Japanese is notorious for its counting system. 1 shirt is ichi-mai, 1 o'clock is ichi-ji, 1st floor is ikkai, and 1 cat is ippiki. Even Japanese people struggle with how to know when to use which counter - which is why publisher Shogakukan created this Kazoekata no Jiten. Simply look up the word you're wondering about, and quickly find out which counter - or counters - you should use. This invaluable resource - the dictionary and all explanations - is in japanese, so we only recommend it for higher level students.