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Cillian O'Brien

Age: 17 years old
Age Category: 17-18
Team: Fox Swim Club | Maryland Swimming

Personal Best

Short course distance

Event Time Age Date Standard Next Standard Fox Swim Club Maryland Swimming Eastern Zone USA
Free 50 Y 23.82 16 10/18/2025 BB A: 23.59 (+0.23s | 1.0%) 3 84 772 1,000+
Free 100 Y 51.23 16 10/18/2025 A AA: 49.59 (+1.64s | 3.2%) 2 68 638 1,000+
50 Free
24.71
24.71
100 Free
26.52
51.23
100 Free
51.23
Free 200 Y 1:54.22 17 02/19/2026 A AA: 1:49.69 (+4.53s | 4.0%) 2 65 638 1,000+
50 Free
25.14
25.14
100 Free
28.11
53.25
100 Free
53.25
150 Free
30.26
1:23.51
200 Free
30.71
1:54.22
100 Free
1:00.97
Free 500 Y 5:08.33 16 11/01/2025 A AA: 4:58.39 (+9.94s | 3.2%) 2 38 392 1,000+
50 Free
26.96
26.96
100 Free
30.07
57.03
100 Free
57.03
150 Free
31.13
1:28.16
200 Free
31.65
1:59.81
100 Free
1:02.78
250 Free
31.71
2:31.52
350 Free
1:03.30
3:34.82
400 Free
32.28
4:07.10
100 Free
1:35.58
450 Free
30.90
4:38.00
500 Free
30.33
5:08.33
100 Free
1:01.23
Free 1000 Y 10:56.65 16 11/08/2025 BB A: 10:51.59 (+5.06s | 0.8%) 2 29 248 1,000+
Free 1650 Y 18:02.97 16 11/08/2025 A AA: 17:22.39 (+40.58s | 3.7%) 2 24 179 811
50 Free
27.80
27.80
100 Free
31.92
59.72
100 Free
59.72
150 Free
32.49
1:32.21
200 Free
33.27
2:05.48
100 Free
1:05.76
250 Free
32.85
2:38.33
300 Free
32.79
3:11.12
100 Free
1:05.64
350 Free
33.90
3:45.02
400 Free
33.48
4:18.50
100 Free
1:07.38
450 Free
33.68
4:52.18
500 Free
33.78
5:25.96
100 Free
1:07.46
550 Free
32.63
5:58.59
600 Free
34.57
6:33.16
100 Free
1:07.20
650 Free
34.55
7:07.71
700 Free
34.03
7:41.74
100 Free
1:08.58
750 Free
32.20
8:13.94
800 Free
32.51
8:46.45
100 Free
1:04.71
850 Free
32.22
9:18.67
900 Free
31.42
9:50.09
100 Free
1:03.64
950 Free
32.82
10:22.91
1000 Free
33.74
10:56.65
100 Free
1:06.56
1050 Free
33.73
11:30.38
1100 Free
33.16
12:03.54
100 Free
1:06.89
1150 Free
32.56
12:36.10
1200 Free
33.53
13:09.63
100 Free
1:06.09
1250 Free
33.06
13:42.69
1300 Free
33.31
14:16.00
100 Free
1:06.37
1350 Free
32.96
14:48.96
1400 Free
33.62
15:22.58
100 Free
1:06.58
1450 Free
32.26
15:54.84
1500 Free
32.98
16:27.82
100 Free
1:05.24
1550 Free
31.85
16:59.67
1600 Free
32.67
17:32.34
100 Free
1:04.52
1650 Free
30.63
18:02.97
Back 50 Y 25.96 16 12/21/2025 2 26 203 932
Back 100 Y 54.69 17 02/19/2026 A AA: 53.59 (+1.10s | 2.0%) 2 26 246 1,000+
Back 200 Y 1:59.00 16 11/01/2025 A AA: 1:58.19 (+0.81s | 0.7%) 2 18 174 843
50 Back
27.71
27.71
100 Back
29.94
57.65
100 Back
57.65
150 Back
30.92
1:28.57
200 Back
30.43
1:59.00
100 Back
1:01.35
Breast 100 Y 1:11.49 16 10/18/2025 B BB: 1:09.39 (+2.10s | 2.9%) 4 82 739 1,000+
50 Breast
33.67
33.67
100 Breast
37.82
1:11.49
100 Breast
1:11.49
Breast 200 Y 3:02.12 13 12/08/2022 B: 2:42.29 (+19.83s | 10.9%) 4 84 688 1,000+
50 Breast
41.17
41.17
100 Breast
47.23
1:28.40
100 Breast
1:28.40
150 Breast
46.60
2:15.00
200 Breast
47.12
3:02.12
100 Breast
1:33.72
Fly 100 Y 57.69 16 10/18/2025 BB A: 56.09 (+1.60s | 2.8%) 3 76 670 1,000+
50 Fly
26.96
26.96
100 Fly
30.73
57.69
100 Fly
57.69
Fly 200 Y 2:12.21 16 11/01/2025 BB A: 2:05.49 (+6.72s | 5.1%) 2 51 410 1,000+
50 Fly
27.30
27.30
100 Fly
32.44
59.74
100 Fly
59.74
150 Fly
35.70
1:35.44
200 Fly
36.77
2:12.21
100 Fly
1:12.47
IM 200 Y 2:09.47 16 10/18/2025 BB A: 2:06.39 (+3.08s | 2.4%) 3 61 592 1,000+
50 Fly
27.06
27.06
100 Back
30.73
57.79
100 IM
57.79
150 Breast
43.01
1:40.80
200 Free
28.67
2:09.47
100 IM
1:11.68
IM 400 Y 4:37.94 16 11/01/2025 BB A: 4:31.99 (+5.95s | 2.1%) 2 44 393 1,000+
50 Fly
29.19
29.19
100 Fly
31.96
1:01.15
100 Fly
1:01.15
150 Back
33.45
1:34.60
200 Back
34.81
2:09.41
100 Back
1:08.26
250 Breast
43.17
2:52.58
300 Breast
45.65
3:38.23
100 Breast
1:28.82
350 Free
29.14
4:07.37
400 Free
30.57
4:37.94
100 Free
59.71

Long course distance

Event Time Age Date Standard Next Standard Fox Swim Club Maryland Swimming Eastern Zone USA

Above are the fastest times that Cillian O'Brien has achieved in his swimming career. For each event, you can find Cillian's best time, the corresponding time standard, as well as how much faster Cillian needs to be to reach the next level. The last columns provide Cillian rankings at the team and LSC levels. These rankings are based on the Cillian's personal best, his current age category, and team; and are calculated from all the meets results.

Disclaimer: This Website is not affiliated with USA Swimming or any Local Swim Committee. The rankings and times displayed on this website are unofficial and should not be viewed as such. We update our information regularly, but we cannot guarantee that the data is accurate, timely, or complete. The only purpose of this website is entertainment. None of the information here should be used for university admission applications.