8 strokes
empty, sky, void, vacant, vacuum
Jōyō kanji, taught in grade 1
JLPT level N4
304 of 2500 most used kanji in newspapers


Stroke order

On reading compounds

  • 空 【クウ】 empty air, sky, shunyata, emptiness, the lack of an immutable intrinsic nature within any phenomenon, air force, fruitlessness, meaninglessness, void (one of the five elements), empty (e.g. set)
  • 空気 【クウキ】 air, atmosphere, mood, situation, someone with no presence, someone who doesn't stand out at all
  • 中空 【チュウクウ】 hollow, mid-air, air, sky
  • 防空 【ボウクウ】 air defense, air defence

Kun reading compounds

  • 空 【そら】 sky, the air, the heavens, weather, far-off place, distant place, state of mind, feeling, (from) memory, (by) heart, falsehood, lie, somehow, vaguely, fake
  • うろ覚え 【うろおぼえ】 vague recollection, faint memory, rote memorization, rote memorisation
  • 定めなき空 【さだめなきそら】 changeable weather
  • 光に満ちた空 【ひかりにみちたそら】 sky suffused with light
  • 開く 【あく】 to open (e.g. doors), to open (e.g. business, etc.), to be empty, to be vacant, to be available, to be free, to be open (e.g. neckline, etc.), to have been opened (of one's eyes, mouth, etc.), to come to an end, to open (one's eyes, mouth, etc.), to have a hole, to form a gap, to have an interval (between events)
  • 空き 【あき】 space, room, gap, emptiness, vacancy, opening, empty seat, free time, time to spare, disuse, unused thing
  • 空き缶 【あきかん】 empty can
  • 開ける 【あける】 to open (a door, etc.), to unwrap (e.g. parcel, package), to unlock, to open (for business, etc.), to empty, to remove, to make space, to make room, to move out, to clear out, to be away from (e.g. one's house), to leave (temporarily), to dawn, to grow light, to end (of a period, season), to begin (of the New Year), to leave (one's schedule) open, to make time (for), to make (a hole), to open up (a hole)
  • 空 【から】 emptiness, vacuum, blank
  • 空っぽ 【からっぽ】 empty, vacant, hollow
  • もぬけの殻 【もぬけのから】 completely empty, vacant, deserted, (everything) gone
  • 空く 【すく】 to become less crowded, to thin out, to get empty, to be hungry
  • 空かす 【すかす】 to feel hungry, to get hungry
  • 虚しい 【むなしい】 empty, void, vacant, vain, fruitless, futile, ineffective, lifeless
  • 虚しい名声 【むなしいめいせい】 empty name


Japanese names:
うつ、 き、 く
kong1, kong4


  • cielo
  • atmósfera
  • vacío
  • vacante
  • quedarse vacío
  • vaciar


  • esvaziar
  • ceú
  • desocupado
  • vazio
  • vácuo


  • vide
  • ciel
  • vacant
  • creux
65 A Guide To Reading and Writing Japanese (Florence Sakade)
66 A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot)
15 A Guide To Remembering Japanese Characters (Kenneth G. Henshall)
233 A New Dictionary of Kanji Usage
3317 Classic Nelson (Andrew Nelson)
184 Essential Kanji (P.G. O’Neill)
77 Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki)
723 Japanese Names (P.G. O’Neill)
2.17 Japanese for Busy People
140 Kanji and Kana (Spahn and Hadamitzky)
140 Kanji and Kana, 2nd Edition (Spahn and Hadamitzky)
461 Kanji in Context (Nishiguchi and Kono)
1452 Kodansha Compact Kanji Guide
2767 Kodansha Kanji Dictionary (Jack Halpern)
1418 Kodansha Kanji Learner’s Dictionary (Jack Halpern)
1913 Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern)
1327 Les Kanjis dans la tete (Yves Maniette)
25415 Morohashi
2227 New Japanese English Character Dictionary (Jack Halpern)
4192 New Nelson (John Haig)
1317 Remembering The Kanji (James Heisig)
1414 Remembering The Kanji, 6th edition (James Heisig)
304 The Kanji Way to Japanese Language Power (Dale Crowley)
73 Tuttle Kanji Cards (Alexander Kask)
772 2001 Kanji
3m5.12 The Kanji Dictionary
2-3-5 SKIP code
2-5-3 SKIP code
3010.1 Four corner code
22-85 JIS X 0208-1997 kuten code
7a7a Unicode hex code