| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:20.52 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 100m Butterfly | 1:15.06 | 2026 Eastern Ontario Regional Championship - Winte | 2026-01-30 |
| 100m Freestyle | 1:06.66 | 2026 Eastern Ontario Regional Championship - Winte | 2026-01-30 |
| 100m IM | 1:19.20 | 2025 Maddy Kort Invitational | 2025-06-20 |
| 200m Breaststroke | 3:14.88 | BBST Fall Invitational 2025 | 2025-11-21 |
| 200m Butterfly | 2:58.12 | Beast Cup 2026 | 2026-01-10 |
| 200m Freestyle | 2:27.58 | BBST Fall Invitational 2025 | 2025-11-21 |
| 200m IM | 2:51.58 | BBST Fall Invitational 2025 | 2025-11-21 |
| 400m Freestyle | 5:22.85 | BBST Fall Invitational 2025 | 2025-11-21 |
| 50m Backstroke | 35.94 | 2026 Eastern Ontario Regional Championship - Winte | 2026-01-30 |
| 50m Breaststroke | 42.41 | KBM Pentathlon | 2025-10-19 |
| 50m Butterfly | 32.89 | Beast Cup 2026 | 2026-01-10 |
| 50m Freestyle | 29.98 | 2026 Eastern Ontario Regional Championship - Winte | 2026-01-30 |
Chadwick, Gianna's top personal bests include 100m Backstroke (1:20.52), 100m Butterfly (1:15.06), 100m Freestyle (1:06.66), 100m IM (1:19.20), 200m Breaststroke (3:14.88).
Chadwick, Gianna swims for Belleville Beast Swim Team.
Chadwick, Gianna has competed in 8 meets.