| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Breaststroke | 1:40.37 | Victoria Masters Swim Club Long Course Meet | 2026-01-24 |
| 100m Freestyle | 1:34.11 | Victoria Masters Swim Club Long Course Meet | 2026-01-24 |
| 200m Breaststroke | 3:37.57 | Victoria Masters Swim Club Long Course Meet | 2026-01-24 |
| 200m Butterfly | 4:47.69 | Nanaimo Ebbtides 44th Annual Master Swim Meet | 2025-11-22 |
| 25m Breaststroke | 20.29 | Nanaimo Ebbtides 44th Annual Master Swim Meet | 2025-11-22 |
| 25m Butterfly | 20.48 | Nanaimo Ebbtides 44th Annual Master Swim Meet | 2025-11-22 |
| 50m Breaststroke | 45.10 | Victoria Masters Swim Club Long Course Meet | 2026-01-24 |
| 50m Breaststroke | 44.92 | Nanaimo Ebbtides 44th Annual Master Swim Meet | 2025-11-22 |
Chang, Johann's top personal bests include 100m Breaststroke (1:40.37), 100m Freestyle (1:34.11), 200m Breaststroke (3:37.57), 200m Butterfly (4:47.69), 25m Breaststroke (20.29).
Chang, Johann swims for Coast Swim Team.
Chang, Johann has competed in 2 meets.