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BOSTON MARATHON 2025

Jiachi Tsai

Bib: 25407•F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F60-64)
#0 / 624
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
27:18
Rank: #21433
Start → 5K
27:18 | 8:47/mi
10K· 6.21 mi
56:10
Rank: #22572 (-1139)
5K → 10K
28:52 | 9:17/mi
15K· 9.32 mi
1:26:15
Rank: #23282 (-710)
10K → 15K
30:05 | 9:41/mi
20K· 12.43 mi
1:57:40
Rank: #23655 (-373)
15K → 20K
31:25 | 10:07/mi
Half· 13.11 mi
2:04:40
Rank: #23760 (-105)
20K → Half
7:00 | 10:16/mi
25K· 15.53 mi
2:31:07
Rank: #24051 (-291)
Half → 25K
26:27 | 10:55/mi
30K· 18.64 mi
3:10:07
Rank: #24653 (-602)
25K → 30K
39:00 | 12:33/mi
20M
3:28:32
Rank: #24927 (-274)
30K → 20M
18:25 | 13:33/mi
21M
3:43:17
Rank: #25110 (-183)
20M → 21M
14:45 | 14:45/mi
35K· 21.75 mi
3:53:33
Rank: #25247 (-137)
21M → 35K
10:16 | 13:43/mi
23M
4:10:42
Rank: #25392 (-145)
35K → 23M
17:09 | 13:42/mi
24M
4:24:19
Rank: #25539 (-147)
23M → 24M
13:37 | 13:37/mi
40K· 24.85 mi
4:36:31
Rank: #25680 (-141)
24M → 40K
12:12 | 14:16/mi
25.2M
4:41:13
Rank: #25684 (-4)
40K → 25.2M
4:42 | 13:38/mi
Finish· 26.22 mi
4:52:34
Rank: #25694 (-10)
25.2M → Finish
11:21 | 11:08/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:04:40
Pace9:31 /mi
2nd Half
Distance13.11 mi
Time2:47:54
Pace12:48 /mi
📊Positive Split: 34.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:26:5827:188:4727:18
8:47
-
10K
6.21 mi11:55:5056:109:0228:52
9:17
+0:30
15K
9.32 mi12:25:551:26:159:1530:05
9:41
+0:24
20K
12.43 mi12:57:201:57:409:2831:25
10:07
+0:26
Half
13.11 mi13:04:202:04:409:317:00
10:16
+0:09
25K
15.53 mi13:30:472:31:079:4426:27
10:55
+0:39
30K
18.64 mi14:09:473:10:0710:1239:00
12:33
+1:38
20M
20.00 mi14:28:123:28:3210:2618:25
13:33
+1:00
21M
21.00 mi14:42:573:43:1710:3814:45
14:45
+1:12
35K
21.75 mi14:53:133:53:3310:4410:16
13:43
-1:02
23M
23.00 mi15:10:224:10:4210:5417:09
13:42
-0:01
24M
24.00 mi15:23:594:24:1911:0113:37
13:37
-0:05
40K
24.85 mi15:36:114:36:3111:0812:12
14:16
+0:39
25.2M
25.20 mi15:40:534:41:1311:104:42
13:38
-0:38
Finish
26.22 mi15:52:144:52:3411:1011:21
11:08
-2:30

Checkpoints & Pacing

📈Pace Line

Pace Progression

Track your pace changes throughout the race. Dot colors mark your quickest to easiest segments, relative to your own pace.

Fastest Pace

8:47 /mi

Average Pace

11:10 /mi

Slowest Pace

14:45 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:42:28

56% of race

Time at Steady Pace

39:00

13% of race

Time at Slower Pace

1:31:06

31% of race

Average Pace: 11:09 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

🎨Heatmap

Pace Heatmap

Where you sped up and eased off relative to your own pace across the race. Colors are relative to your own range, not to other runners.

Loading...
0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Click or hover over segments to see details

✨Sparklines

Checkpoint Splits with Pace Trends

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:26:5827:188:4727:18
8:47
#21433
10K
6.21 mi11:55:5056:109:0228:52
9:17
#22572
15K
9.32 mi12:25:551:26:159:1530:05
9:41
#23282
20K
12.43 mi12:57:201:57:409:2831:25
10:07
#23655
Half
13.11 mi13:04:202:04:409:317:00
10:16
#23760
25K
15.53 mi13:30:472:31:079:4426:27
10:55
#24051
30K
18.64 mi14:09:473:10:0710:1239:00
12:33
#24653
20M
20.00 mi14:28:123:28:3210:2618:25
13:33
#24927
21M
21.00 mi14:42:573:43:1710:3814:45
14:45
#25110
35K
21.75 mi14:53:133:53:3310:4410:16
13:43
#25247
23M
23.00 mi15:10:224:10:4210:5417:09
13:42
#25392
24M
24.00 mi15:23:594:24:1911:0113:37
13:37
#25539
40K
24.85 mi15:36:114:36:3111:0812:12
14:16
#25680
25.2M
25.20 mi15:40:534:41:1311:104:42
13:38
#25684
Finish
26.22 mi15:52:144:52:3411:1011:21
11:08
#25694
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF60-64Seg. OverallSeg. FemalesSeg. F60-64
5K3.11 mi3.11 mi214338326832624222(Top 85%)9798(Top 80%)9798(Top 1570%)
10K6.21 mi3.10 mi22572-11398925-5998925-59923488(Top 83%)9405(Top 77%)9405(Top 1507%)
15K9.32 mi3.11 mi23282-7109281-3569281-35624222(Top 85%)9798(Top 80%)9798(Top 1570%)
20K12.43 mi3.11 mi23655-3739488-2079488-20724459(Top 86%)9966(Top 82%)9966(Top 1597%)
Half13.11 mi0.68 mi23760-1059552-649552-6425352(Top 89%)10468(Top 86%)10468(Top 1678%)
25K15.53 mi2.42 mi24051-2919737-1859737-18525070(Top 88%)10331(Top 84%)10331(Top 1656%)
30K18.64 mi3.11 mi24653-60210089-35210089-35226225(Top 92%)11076(Top 91%)11076(Top 1775%)
20M20.00 mi1.36 mi24927-27410257-16810257-16826949(Top 95%)11528(Top 94%)11528(Top 1847%)
21M21.00 mi1.00 mi25110-18310367-11010367-11026932(Top 95%)11530(Top 94%)11530(Top 1848%)
35K21.75 mi0.75 mi25247-13710451-8410451-8427507(Top 97%)11859(Top 97%)11859(Top 1900%)
23M23.00 mi1.25 mi25392-14510552-10110552-10127059(Top 95%)11638(Top 95%)11638(Top 1865%)
24M24.00 mi1.00 mi25539-14710639-8710639-8727412(Top 97%)11851(Top 97%)11851(Top 1899%)
40K24.85 mi0.85 mi25680-14110727-8810727-8827375(Top 96%)11814(Top 97%)11814(Top 1893%)
25.2M25.20 mi0.35 mi25684-410731-410731-425805(Top 91%)11088(Top 91%)11088(Top 1777%)
Finish26.22 mi1.02 mi25694-1010743-1210743-1225601(Top 90%)10958(Top 90%)10958(Top 1756%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 85%
×21stories
+97ft-345ft

Overall

24222

Females

9798

F60-64

9798

5K→10K

3.1 - 6.2 mi

Top 83%
×5stories
+79ft-138ft

Overall

23488

Females

9405

F60-64

9405

10K→15K

6.2 - 9.3 mi

Top 85%
×3stories
+67ft-78ft

Overall

24222

Females

9798

F60-64

9798

15K→20K

9.3 - 12.4 mi

Top 86%
×5stories
+106ft-86ft

Overall

24459

Females

9966

F60-64

9966

20K→Half

12.4 - 13.1 mi

Top 89%
×2stories
+19ft-37ft

Overall

25352

Females

10468

F60-64

10468

Half→25K

13.1 - 15.5 mi

Top 88%
×4stories
+66ft-88ft

Overall

25070

Females

10331

F60-64

10331

25K→30K

15.5 - 18.6 mi

Top 92%
×9stories
+181ft-148ft

Overall

26225

Females

11076

F60-64

11076

30K→20M

18.6 - 20.0 mi

Top 95%
×5stories
+64ft-50ft

Overall

26949

Females

11528

F60-64

11528

20M→21M

20.0 - 21.0 mi

Top 95%
×8stories
+106ft-24ft

Overall

26932

Females

11530

F60-64

11530

21M→35K

21.0 - 21.8 mi

Top 97%
×7stories
+17ft-86ft

Overall

27507

Females

11859

F60-64

11859

35K→23M

21.8 - 23.0 mi

Top 95%
×5stories
+23ft-63ft

Overall

27059

Females

11638

F60-64

11638

23M→24M

23.0 - 24.0 mi

Top 97%
×6stories
+12ft-82ft

Overall

27412

Females

11851

F60-64

11851

24M→40K

24.0 - 24.9 mi

Top 96%
×1story
+6ft-20ft

Overall

27375

Females

11814

F60-64

11814

40K→25.2M

24.9 - 25.2 mi

Top 91%
×1story
+13ft-16ft

Overall

25805

Females

11088

F60-64

11088

25.2M→Finish

25.2 - 26.2 mi

Top 90%
×2stories
+22ft-21ft

Overall

25601

Females

10958

F60-64

10958

Passing Analysis

Category:
Athletes Passed
314
Passed By
4575
Net Change
-4261
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21433
5K → 10K321171-1139#21433#22572
10K → 15K42752-710#22572#23282
15K → 20K67440-373#23282#23655
20K → Half3108-105#23655#23760
Half → 25K52343-291#23760#24051
25K → 30K24626-602#24051#24653
30K → 20M13287-274#24653#24927
20M → 21M11194-183#24927#25110
21M → 35K5142-137#25110#25247
35K → 23M8153-145#25247#25392
23M → 24M8155-147#25392#25539
24M → 40K10151-141#25539#25680
40K → 25.2M1115-4#25680#25684
25.2M → Finish2838-10#25684#25694
TOTALS3144575-4261
📊

Passing Visuals

Category:
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🔥Passing Intensity

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing