| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:09.31 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 100m Butterfly | 1:12.69 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 100m Freestyle | 59.26 | OUA & Club Winter Invitational | 2026-01-17 |
| 100m IM | 1:15.84 | 2025 Downtown Sprint Meet | 2025-10-25 |
| 200m Backstroke | 2:30.96 | Border City Invitational 2025 | 2025-12-05 |
| 200m Freestyle | 2:20.45 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 200m IM | 2:39.91 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 50m Backstroke | 31.32 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 50m Breaststroke | 42.13 | 2025 Downtown Sprint Meet | 2025-10-25 |
| 50m Butterfly | 30.27 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 50m Freestyle | 26.69 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
Buchanan, Jack's top personal bests include 100m Backstroke (1:09.31), 100m Butterfly (1:12.69), 100m Freestyle (59.26), 100m IM (1:15.84), 200m Backstroke (2:30.96).
Buchanan, Jack swims for Toronto Swim Club.
Buchanan, Jack has competed in 10 meets.