8 strokes
power, force
merit, efficacy, efficiency, benefit
Jōyō kanji, taught in grade 5
JLPT level N2
538 of 2500 most used kanji in newspapers


Stroke order

On reading compounds

  • 効 【コウ】 efficacy, benefit, efficiency, effect, result, success
  • 効果 【コウカ】 effect, effectiveness, efficacy, result, effects (e.g. sound effects, visual effects, special effects)
  • 実効 【ジッコウ】 practical effect, efficacy, efficiency
  • 時効 【ジコウ】 statute of limitations, lapse of rights after a period of time, prescription (including acquisitive and extinctive prescription), becoming invalid or void after a set time, ageing, aging

Kun reading compounds

  • 効く 【きく】 to be effective, to take effect, to be good (for), to work, to function well, to be possible (to do, use, etc.), to be able to, to taste (alcohol), to try
  • 効き目 【ききめ】 effect, virtue, efficacy, impression, one's dominant eye


Mandarin Chinese (pinyin):


  • eficacia
  • eficiencia
  • efecto
  • ser efectivo


  • mérito
  • eficácia
  • eficiência
  • benefício


  • efficacité
  • bénéfique
  • mérite
782 A Guide To Reading and Writing Japanese (Florence Sakade)
697 A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot)
671 A Guide To Remembering Japanese Characters (Kenneth G. Henshall)
515 A New Dictionary of Kanji Usage
722 Classic Nelson (Andrew Nelson)
623 Essential Kanji (P.G. O’Neill)
370 Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki)
653 Japanese Names (P.G. O’Neill)
816 Kanji and Kana (Spahn and Hadamitzky)
835 Kanji and Kana, 2nd Edition (Spahn and Hadamitzky)
501 Kanji in Context (Nishiguchi and Kono)
216 Kodansha Compact Kanji Guide
1617 Kodansha Kanji Dictionary (Jack Halpern)
849 Kodansha Kanji Learner’s Dictionary (Jack Halpern)
1164 Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern)
1284 Les Kanjis dans la tete (Yves Maniette)
2334 Morohashi
1265 New Japanese English Character Dictionary (Jack Halpern)
535 New Nelson (John Haig)
1276 Remembering The Kanji (James Heisig)
1369 Remembering The Kanji, 6th edition (James Heisig)
682 Tuttle Kanji Cards (Alexander Kask)
445 2001 Kanji
2g6.2 The Kanji Dictionary
1-6-2 SKIP code
0442.7 Four corner code
1-24-90 JIS X 0208-1997 kuten code
52b9 Unicode hex code