How to say "grandpa" in Japanese

• グランパ
  nounA loanword rendering of 'grandpa/grampa' in familiar language. It gives an English-flavored, casual feel and is less common than native options; use it mainly when you want that stylistic tone.
• おじいちゃん
  nounThe everyday affectionate term for one's own grandpa, matching 'grandpa' or 'granddad'. Written in kana alone. It fits most familiar contexts, from family conversation to talking about a beloved grandfather.
  私のおじいちゃんは大工だいくです。↗

  My grandfather is a carpenter.
• じいじ
  nounChildren's language for 'grandpa/gramps', typical of how a small child addresses or refers to a grandfather. Cute and babyish; adults mostly use it when quoting or imitating a child's speech.
• おじいちゃま
  nounA cutesy, respectful (sonkeigo) children's variant of 'grandpa/gramps'. Use it for a doting small child addressing a grandfather politely, as in picture books or family scenes; it is otherwise marginal for general use.

All four are affectionate, familiar ways to say 'grandpa'; pick 「おじいちゃん」 as the everyday default, 「じいじ」 for a small child's speech, 「おじいちゃま」 for extra cuteness, and 「グランパ」 for a loanword flavor.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• グランパgrandpa
• おじいちゃんgrandpa
• じいじgrandpa
• おじいちゃまgrandpa