| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Breaststroke | 1:43.42 | 2026 NKB National Capital Cup | 2026-02-13 |
| 100m Breaststroke | 1:42.14 | 2025 NKB Fall Invitational | 2025-10-17 |
| 100m Butterfly | 1:34.32 | 2026 NKB National Capital Cup | 2026-02-13 |
| 100m Freestyle | 1:16.06 | 2025 NKB Fall Invitational | 2025-10-17 |
| 100m IM | 1:26.28 | 2025 NKB Fall Invitational | 2025-10-17 |
| 200m Backstroke | 3:08.39 | 2025 NKB Fall Invitational | 2025-10-17 |
| 200m Freestyle | 2:55.31 | 2026 NKB National Capital Cup | 2026-02-13 |
| 200m IM | 3:15.95 | 2026 NKB National Capital Cup | 2026-02-13 |
| 200m IM | 3:12.75 | 2025 NKB Fall Invitational | 2025-10-17 |
| 400m Freestyle | 5:59.29 | 2025 NKB Fall Invitational | 2025-10-17 |
| 50m Breaststroke | 48.49 | 2026 NKB National Capital Cup | 2026-02-13 |
| 50m Butterfly | 35.91 | 2026 NKB National Capital Cup | 2026-02-13 |
| 800m Freestyle | 12:22.93 | KBM Distance & Development | 2025-11-08 |
Wirtanen, Clara's top personal bests include 100m Breaststroke (1:43.42), 100m Breaststroke (1:42.14), 100m Butterfly (1:34.32), 100m Freestyle (1:16.06), 100m IM (1:26.28).
Wirtanen, Clara swims for Nepean Kanata Barracudas Swim Club.
Wirtanen, Clara has competed in 3 meets.