How to say "increase" in Japanese

• 増えるふえるJLPT N4approx.Common
  ichidan verb, intransitive verbIntransitive: things grow in number or amount on their own — populations, prices, users. It also covers multiplying. Use it when the subject simply increases, with no one acting on it.
  ここの交通量こうつうりょうは増ふえた。↗

  The traffic has built up here.
• アップJLPT N1approx.Common
  noun, noun (suffix), suru verb, transitive verb, intransitive verbA loanword covering a rise or increase and the raising or lifting of something. For the verb 'to increase' it is seldom what you want; use one of the verbs instead.
  トムは勤務きんむ終了時間しゅうりょうじかんを超こえて働はたらくと、５割わりアップの時給じきゅうをもらっていた。↗

  Tom got time and a half when he worked beyond his usual quitting time.
• 増やすふやすJLPT N2approx.Common
  godan verb, transitive verbTransitive counterpart of 増える: someone increases something — sales, staff, savings, income. Choose it when an agent deliberately adds to or augments an amount.
  体力たいりょくを増ふやすように努つとめなさい。↗

  Try to build up your strength.
• 増加ぞうかJLPT N3approx.Common
  noun, suru verb, transitive verb, intransitive verbA noun for an increase, rise, or growth as an event or quantity; typical of statistics, reports, and news. It names the change itself rather than describing something as growing.
  犯罪はんざい率りつは着実ちゃくじつに増加ぞうかしている。↗

  The crime rate is rising steadily.
• 増すますJLPT N3approx.Common
  godan verb, intransitive verb, transitive verbWorks for both 'something increases' and 'increasing something'; often used for weight, speed, and feelings such as confidence growing in degree. It overlaps with the other verbs.
  その知しらせで彼かれの不安ふあんが増ました。↗

  The news added to his anxiety.

Use 「増える」 for things that increase by themselves, 「増やす」 when someone increases something, 「増す」 for growth in amount or degree, 増加 for the increase as a noun, and 「アップ」 as a loanword for rises and raising.

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

• 増えるふえるto increase
• アップrise
• 増やすふやすto increase
• 増加ぞうかincrease
• 増すますto increase
• 増殖ぞうしょくincrease
• 増額ぞうがくincrease (in an amount of money)
• あがりrise
• 膨張ぼうちょうexpansion
• 増大ぞうだいenlargement
• 増進ぞうしんpromoting
• 増やしふやしincrease
• 繁殖はんしょくbreeding
• 増設ぞうせつadding (equipment, facilities, etc.)
• 増強ぞうきょうreinforcement
• 増ぞうincrease
• 積み増すつみますto increase (an amount of money or goods)
• 加増かぞうincrease
• 積み増しつみましincrease (in an amount of money or goods)
• 増さるまさるto increase
• 増備ぞうびadding equipment (esp. rolling stock)
• かさむto mount up
• ステップアップstep-up
• 増加分ぞうかぶんincrement
• あげるto increase (price, quality, status, etc.)
• 加えるくわえるto increase
• 引き上げるひきあげるto increase
• 加わるくわわるto increase (e.g. heat)
• ましmore
• 引き上げひきあげraising
• 上り坂のぼりざか(gradual) upturn
• 上積みうわづみadding (to)
• のすto gain influence
• 倍するばいするto increase
• 上がるあがるto increase
• 付くつくto be acquired (of a habit, ability, etc.)
• 伸びるのびるto make progress