| 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) |
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
Readings
- Korean:
- hyo
Spanish
- eficacia
- eficiencia
- efecto
- ser efectivo
Portuguese
- mérito
- eficácia
- eficiência
- benefício
French
- efficacité
- bénéfique
- mérite
| 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 |
Jōyō kanji, taught in grade 4
JLPT level N4
410 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 験 【ゲン】 effect, efficacy, omen
- 験者 【ケンザ】 mountaineering ascetic, practitioner of mountain asceticism
- 治験 【チケン】 clinical trial
- 筆記試験 【ヒッキシケン】 written examination
- 験 【ゲン】 effect, efficacy, omen
- ゲン担ぎ 【ゲンカツギ】 superstition, acting superstitiously (for good luck)
- 霊験 【レイゲン】 miraculous efficacy, miracle, miraculous virtue
Kun reading compounds
- 徴 【しるし】 sign, indication, omen
- 試す 【ためす】 to try (out), to have a try (at), to test, to put to the test
- 試し 【ためし】 trial, test
Readings
- Korean:
- heom
Spanish
- prueba
- intento
- efecto
Portuguese
- verificação
- efeito
- teste
French
- vérification
- examen
- effet
| 600 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 500 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 475 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 404 | A New Dictionary of Kanji Usage |
| 5220 | Classic Nelson (Andrew Nelson) |
| 355 | Essential Kanji (P.G. O’Neill) |
| 282 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 2.9 | Japanese for Busy People |
| 532 | Kanji and Kana (Spahn and Hadamitzky) |
| 541 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 793 | Kanji in Context (Nishiguchi and Kono) |
| 1920 | Kodansha Compact Kanji Guide |
| 2306 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1192 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 1628 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1999 | Les Kanjis dans la tete (Yves Maniette) |
| 44835 | Morohashi |
| 1833 | New Japanese English Character Dictionary (Jack Halpern) |
| 6758 | New Nelson (John Haig) |
| 1980 | Remembering The Kanji (James Heisig) |
| 2134 | Remembering The Kanji, 6th edition (James Heisig) |
| 385 | The Kanji Way to Japanese Language Power (Dale Crowley) |
| 635 | Tuttle Kanji Cards (Alexander Kask) |
| 3463 | 2001 Kanji |
| 10a8.4 | The Kanji Dictionary |
| 1-10-8 | SKIP code |
| 7833.6 | Four corner code |
| 1-24-19 | JIS X 0208-1997 kuten code |
| 9a13 | Unicode hex code |