| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:25.52 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 100m Breaststroke | 1:21.09 | Hall of Fame | 2025-10-18 |
| 100m Freestyle | 1:06.88 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 200m Breaststroke | 2:58.59 | ESWIM January Time Trial | 2026-01-20 |
| 200m Freestyle | 2:36.47 | 2025 Age Group International SC | 2025-11-27 |
| 200m IM | 2:48.05 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 400m Freestyle | 5:42.44 | ESWIM 400 Time Trial | 2025-12-16 |
| 400m IM | 6:13.18 | 2025 Age Group International SC | 2025-11-27 |
| 50m Breaststroke | 35.89 | 2025 Age Group International SC | 2025-11-27 |
| 50m Freestyle | 29.83 | 2025 Age Group International SC | 2025-11-27 |
| 800m Freestyle | 11:56.18 | ESWIM Distance Time Trial | 2025-11-11 |
Kalkounis, Jack's top personal bests include 100m Backstroke (1:25.52), 100m Breaststroke (1:21.09), 100m Freestyle (1:06.88), 200m Breaststroke (2:58.59), 200m Freestyle (2:36.47).
Kalkounis, Jack swims for Etobicoke Swim Club.
Kalkounis, Jack has competed in 11 meets.