| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:06.31 | Western Transmountain Festival III | 2026-02-20 |
| 100m Backstroke | 1:04.72 | UCSC Holiday Classic | 2025-12-13 |
| 100m Breaststroke | 1:18.14 | UCSC Grand Prix | 2026-01-30 |
| 100m Butterfly | 1:08.48 | Summer Provincial Championships LC | 2025-07-24 |
| 100m Butterfly | 1:05.26 | UCSC Holiday Classic | 2025-12-13 |
| 100m Freestyle | 1:01.29 | Western Transmountain Festival III | 2026-02-20 |
| 100m Freestyle | 1:01.23 | Cascade Speed Meet 2025 Provincial Series #1 | 2025-11-08 |
| 200m Backstroke | 2:22.89 | Western Transmountain Festival III | 2026-02-20 |
| 200m Backstroke | 2:15.70 | UCSC Holiday Classic | 2025-12-13 |
| 200m Freestyle | 2:17.57 | Summer Provincial Championships LC | 2025-07-24 |
| 200m Freestyle | 2:11.70 | UCSC Holiday Classic | 2025-12-13 |
| 200m IM | 2:27.63 | Western Transmountain Festival III | 2026-02-20 |
| 200m IM | 2:29.19 | Cascade Speed Meet 2025 Provincial Series #1 | 2025-11-08 |
| 400m Freestyle | 4:42.03 | UCSC Grand Prix | 2026-01-30 |
| 50m Backstroke | 30.22 | UCSC Holiday Classic | 2025-12-13 |
| 50m Breaststroke | 39.57 | UCSC Grand Prix | 2026-01-30 |
| 50m Butterfly | 29.36 | Western Transmountain Festival III | 2026-02-20 |
| 50m Butterfly | 30.10 | Cascade Speed Meet 2025 Provincial Series #1 | 2025-11-08 |
| 50m Freestyle | 29.09 | Summer Provincial Championships LC | 2025-07-24 |
| 50m Freestyle | 27.36 | Cascade Speed Meet 2025 Provincial Series #1 | 2025-11-08 |
Kolchagov, Stefan's top personal bests include 100m Backstroke (1:06.31), 100m Backstroke (1:04.72), 100m Breaststroke (1:18.14), 100m Butterfly (1:08.48), 100m Butterfly (1:05.26).
Kolchagov, Stefan swims for Calgary Swimming.
Kolchagov, Stefan has competed in 7 meets.