| Ranking | time | gap | React | 50m | HR |
| 1. Adam Peaty |  GBR | 26.10s | 0.63 | Q | 1. |
| 2. Cameron van der Burgh |  RSA | 26.54s | 0.44 | 0.62 | 1. |
| 3. Joao Gomes Junior |  BRA | 26.67s | 0.57 | 0.63 | 2. |
| 4. Kevin Cordes |  USA | 26.83s | 0.73 | 0.70 | 1. |
| 5. Kirill Prigoda |  RUS | 26.91s | 0.81 | 0.61 | 2. |
| 6. Felipe Lima | BRA | 26.93s | 0.83 | 0.70 | 2. |
| 7. Ilya Shymanovich |  BLR | 27.01s | 0.91 | 0.69 | 3. |
| 8. Fabio Scozzoli |  ITA | 27.04s | 0.94 | 0.64 | 3. |
| 9. Nicolo Martinenghi | ITA | 27.08s | 0.98 | 0.65 | 3. |
| 10.Yasuhiro Koseki |  JPN | 27.21s | 1.11 | 0.65 | 4. |
| 11.Giedrius Titenis |  LTU | 27.24s | 1.14 | 0.70 | 4. |
| 12.Zibei YAN |  CHN | 27.25s | 1.15 | 0.67 | 5. |
| 13.Caba Siladi |  SRB | 27.27s | 1.17 | 0.74 | 4. |
| 13.Johannes Skagius |  SWE | 27.27s | 1.17 | 0.68 | 5. |
| 15.Cody Miller | USA | 27.31s | 1.21 | 0.64 | 6. |
| 16.Peter Stevens |  SLO | 27.39s | 1.29 | 0.58 | 5. |
| eliminated |
| 16.Vsevolod Zanko | RUS | 27.39s | 1.29 | 0.67 | 5. |
| 16.Arno Kamminga |  NED | 27.39s | 1.29 | 0.64 | 7. |
| bellow standard A 27.51s |
| 19.Richard Funk |  CAN | 27.59s | 1.49 | 0.63 | 8. |
| 20.Nikola Obrovac |  CRO | 27.61s | 1.51 | 0.67 | 6. |
| 21.Ari-Pekka Liukkonen |  FIN | 27.66s | 1.56 | 0.66 | 1. |
| 22.Jorge Murillo Valdes |  COL | 27.67s | 1.57 | 0.69 | 7. |
| 23.Christian Vom Lehn |  GER | 27.68s | 1.58 | 0.67 | 8. |
| 24.Matthew Wilson |  AUS | 27.69s | 1.59 | 0.61 | 2. |
| 25.Marcin Tomasz Stolarski |  POL | 27.73s | 1.63 | 0.66 | 7. |
| 26.Dmitriy Balandin |  KAZ | 27.74s | 1.64 | 0.66 | 9. |
| 27.Youssef Elkamash |  EGY | 27.79s | 1.69 | 0.68 | 9. |
| 27.Renato Prono |  PAR | 27.79s | 1.69 | 0.65 | 9. |
| 29.Yannick Kaser |  SUI | 27.84s | 1.74 | 0.74 | 3. |
| 30.Huseyin Emre Sakci |  TUR | 27.90s | 1.80 | 0.62 | 4. |
| 31.Marek Botik |  SVK | 27.92s | 1.82 | 0.68 | 8. |
| 32.Edgar Crespo |  PAN | 27.93s | 1.83 | 0.66 | 9. |
| 33.Ioannis Karpouzlis |  GRE | 28.07s | 1.97 | 0.65 | 10. |
| 33.Lachezar Shumkov |  BUL | 28.07s | 1.97 | 0.62 | 10. |
| 35.Martin Melconian |  URU | 28.10s | 2.00 | 0.78 | 5. |
| 36.Azad Al Barazi Azad Albarazi |  SYR | 28.13s | 2.03 | 0.67 | 6. |
| 36.James Deiparine |  PHI | 28.13s | 2.03 | 0.63 | 1. |
| 38.Nikolajs Maskalenko |  LAT | 28.27s | 2.17 | 0.65 | 7. |
| 39.Carlos Claverie |  VEN | 28.28s | 2.18 | 0.75 | 8. |
| 40.Miguel Alejandro de Lara Ojeda |  MEX | 28.29s | 2.19 | 0.68 | 2. |
| 41.Filipp Provorkov |  EST | 28.37s | 2.27 | 0.68 | 3. |
| 42.Jordy Groters |  ARU | 28.40s | 2.30 | 0.61 | 4. |
| 43.Gabor Financsek |  HUN | 28.44s | 2.34 | 0.68 | 9. |
| bellow standard A 27.51s |
| eliminated |
| bellow standard B 28.47s |
| 44.Indra Gunawan |  INA | 28.50s | 2.40 | 0.69 | 5. |
| 45.Kirill Vais |  KGZ | 28.61s | 2.51 | 0.70 | 6. |
| 46.Chun-Feng Wu |  TPE | 28.75s | 2.65 | 0.68 | 10. |
| 47.James Lawson |  ZIM | 28.85s | 2.75 | 0.70 | 1. |
| 48.Mario Alberto Santos Ervedosa |  ANG | 29.26s | 3.16 | 0.71 | 2. |
| 49.Santiago Cavanagh |  BOL | 29.29s | 3.19 | 0.75 | 1. |
| 50.Evghenii Paponin |  MDA | 29.42s | 3.32 | 0.75 | 3. |
| 51.Nhyn Mhlln G N'Fernander |  BAH | 29.75s | 3.65 | 0.70 | 4. |
| 52.Marc Rojas |  DOM | 29.84s | 3.74 | 0.72 | 7. |
| 53.Sebastien Kouma |  MLI | 29.92s | 3.82 | 0.71 | 5. |
| 54.Corey Ollivierre |  GRN | 29.94s | 3.84 | 0.65 | 8. |
| 55.Gregory Robert Penny |  ISV | 29.96s | 3.86 | 0.71 | 6. |
| 56.Rainier Rafaela |  CUR | 29.97s | 3.87 | 0.69 | 7. |
| 57.Roland Toftum |  FAR | 30.16s | 4.06 | 0.63 | 9. |
| 58.Ronan Wantenaar |  NAM | 30.27s | 4.17 | 0.70 | 1. |
| 59.Ashley Seeto |  PNG | 30.30s | 4.20 | 0.81 | 2. |
| 60.Abdoul K M Niane |  SEN | 30.31s | 4.21 | 0.70 | 8. |
| 61.Adrian Robinson |  BOT | 30.38s | 4.28 | 0.57 | 2. |
| 62.Epeli Herbert Jordan Rabua |  FIJ | 30.44s | 4.34 | 0.63 | 9. |
| 63.Alex Axiotis |  ZAM | 30.65s | 4.55 | 0.67 | 10. |
| 64.Muis Ahmad |  BRU | 30.73s | 4.63 | 0.78 | 1. |
| 65.Anthony Souaiby |  LIB | 30.84s | 4.74 | 0.76 | 3. |
| 66.Dionisio Augustine |  FSM | 32.28s | 6.18 | 0.66 | 3. |
| 67.Tindwende Sawadogo |  BUR | 32.38s | 6.28 | 0.73 | 4. |
| 68.Shuvam Shrestha |  NEP | 32.50s | 6.40 | 0.78 | 4. |
| 69.Slava Sihanouvong |  LAO | 32.60s | 6.50 | 0.76 | 5. |
| 70.Adil Bharmal |  TAN | 32.67s | 6.57 | 0.67 | 5. |
| 71.Ekirikubinza Joshua Tibatemwa |  UGA | 32.77s | 6.67 | 0.78 | 6. |
| 72.Abdulmalik Ben Musa |  LBA | 32.92s | 6.82 | 0.77 | 2. |
| 73.Simanga Dlamini |  SWZ | 33.07s | 6.97 | 0.76 | 3. |
| 74.Alassane Seydou Lancina |  NIG | 35.00s | 8.90 | 0.85 | 6. |
| 75.Moris Beale |  SLE | 35.13s | 9.03 | 0.83 | 7. |
| 76.Ramziyor Khorkashov |  TJK | 35.52s | 9.42 | 0.75 | 4. |
| 77.Ablam Awoussou |  BEN | 36.34s | 10.24 | 0.74 | 8. |
| 78.Athoumane Athoumane |  COM | 36.61s | 10.51 | 0.79 | 5. |
| 79.Hamid Rahimi |  AFG | 37.95s | 11.85 | 0.77 | 9. |
| 80.Ebrahim Esam Mohammed Moh Al-Maleki |  YEM | 38.98s | 12.88 | 0.77 | 7. |
| 81.Houssein Gaber Ibrahim |  DJI | 40.55s | 14.45 | 0.79 | 10. |
| -. Wassim Elloumi |  TUN | DNS |
| -. Yegan Y Jobe |  GAM | DNS |
| -. Dasar Xhambazi |  KOS | DNS |
| Swim-Of |
| 17.Peter Stevens | SLO | 27.38s | | 0.58 | 1. |
| 18.Vsevolod Zanko | RUS | 27.41s | 0.03 | 0.64 | 2. |
| 19.Arno Kamminga | NED | 27.43s | 0.08 | 0.66 | 3. |
index Budapest 2017