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BOSTON MARATHON 2025

Chiawei Kao

Bib: 3687•M

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 24%
Gender (Male)
#0 / 16105
Top 37%
Division (M18-39)
#0 / 5642
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:48
Rank: #5407
Start → 5K
20:48 | 6:42/mi
10K· 6.21 mi
42:05
Rank: #6043 (-636)
5K → 10K
21:17 | 6:51/mi
15K· 9.32 mi
1:03:12
Rank: #6010 (+33)
10K → 15K
21:07 | 6:48/mi
20K· 12.43 mi
1:24:34
Rank: #5983 (+27)
15K → 20K
21:22 | 6:53/mi
Half· 13.11 mi
1:29:10
Rank: #5972 (+11)
20K → Half
4:36 | 6:45/mi
25K· 15.53 mi
1:45:39
Rank: #5725 (+247)
Half → 25K
16:29 | 6:48/mi
30K· 18.64 mi
2:07:51
Rank: #5661 (+64)
25K → 30K
22:12 | 7:09/mi
20M
2:18:21
Rank: #5855 (-194)
30K → 20M
10:30 | 7:44/mi
21M
2:27:10
Rank: #6142 (-287)
20M → 21M
8:49 | 8:49/mi
35K· 21.75 mi
2:33:26
Rank: #6350 (-208)
21M → 35K
6:16 | 8:23/mi
23M
2:44:22
Rank: #6721 (-371)
35K → 23M
10:56 | 8:44/mi
24M
2:52:07
Rank: #6786 (-65)
23M → 24M
7:45 | 7:45/mi
40K· 24.85 mi
2:58:38
Rank: #6787 (-1)
24M → 40K
6:31 | 7:37/mi
25.2M
3:01:35
Rank: #6792 (-5)
40K → 25.2M
2:57 | 8:33/mi
Finish· 26.22 mi
3:09:26
Rank: #6889 (-97)
25.2M → Finish
7:51 | 7:42/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:29:10
Pace6:48 /mi
2nd Half
Distance13.11 mi
Time1:40:16
Pace7:39 /mi
📊Positive Split: 12.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:24:0220:486:4220:48
6:42
-
10K
6.21 mi10:45:1942:056:4621:17
6:51
+0:09
15K
9.32 mi11:06:261:03:126:4721:07
6:48
-0:03
20K
12.43 mi11:27:481:24:346:4821:22
6:53
+0:05
Half
13.11 mi11:32:241:29:106:484:36
6:45
-0:08
25K
15.53 mi11:48:531:45:396:4816:29
6:48
+0:03
30K
18.64 mi12:11:052:07:516:5222:12
7:09
+0:21
20M
20.00 mi12:21:352:18:216:5510:30
7:44
+0:35
21M
21.00 mi12:30:242:27:107:008:49
8:49
+1:05
35K
21.75 mi12:36:402:33:267:036:16
8:23
-0:26
23M
23.00 mi12:47:362:44:227:0910:56
8:44
+0:21
24M
24.00 mi12:55:212:52:077:107:45
7:45
-0:59
40K
24.85 mi13:01:522:58:387:116:31
7:37
-0:08
25.2M
25.20 mi13:04:493:01:357:122:57
8:33
+0:56
Finish
26.22 mi13:12:403:09:267:147:51
7:42
-0:51

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

6:42 /mi

Average Pace

7:14 /mi

Slowest Pace

8:49 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:07:51

67% of race

Time at Steady Pace

32:37

17% of race

Time at Slower Pace

28:58

15% of race

Average Pace: 7:13 /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 mi10:24:0220:486:4220:48
6:42
#5407
10K
6.21 mi10:45:1942:056:4621:17
6:51
#6043
15K
9.32 mi11:06:261:03:126:4721:07
6:48
#6010
20K
12.43 mi11:27:481:24:346:4821:22
6:53
#5983
Half
13.11 mi11:32:241:29:106:484:36
6:45
#5972
25K
15.53 mi11:48:531:45:396:4816:29
6:48
#5725
30K
18.64 mi12:11:052:07:516:5222:12
7:09
#5661
20M
20.00 mi12:21:352:18:216:5510:30
7:44
#5855
21M
21.00 mi12:30:242:27:107:008:49
8:49
#6142
35K
21.75 mi12:36:402:33:267:036:16
8:23
#6350
23M
23.00 mi12:47:362:44:227:0910:56
8:44
#6721
24M
24.00 mi12:55:212:52:077:107:45
7:45
#6786
40K
24.85 mi13:01:522:58:387:116:31
7:37
#6787
25.2M
25.20 mi13:04:493:01:357:122:57
8:33
#6792
Finish
26.22 mi13:12:403:09:267:147:51
7:42
#6889
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi5407502450246066(Top 21%)5516(Top 34%)5516(Top 98%)
10K6.21 mi3.10 mi6043-6365544-5205544-5206867(Top 24%)6176(Top 38%)6176(Top 109%)
15K9.32 mi3.11 mi6010+335506+385506+386066(Top 21%)5516(Top 34%)5516(Top 98%)
20K12.43 mi3.11 mi5983+275472+345472+346026(Top 21%)5459(Top 34%)5459(Top 97%)
Half13.11 mi0.68 mi5972+115459+135459+135677(Top 20%)5197(Top 32%)5197(Top 92%)
25K15.53 mi2.42 mi5725+2475245+2145245+2144879(Top 17%)4487(Top 28%)4487(Top 80%)
30K18.64 mi3.11 mi5661+645169+765169+765589(Top 20%)5007(Top 31%)5007(Top 89%)
20M20.00 mi1.36 mi5855-1945311-1425311-1428508(Top 30%)6726(Top 42%)6726(Top 119%)
21M21.00 mi1.00 mi6142-2875516-2055516-20512354(Top 43%)8527(Top 53%)8527(Top 151%)
35K21.75 mi0.75 mi6350-2085666-1505666-15014678(Top 52%)9560(Top 59%)9560(Top 169%)
23M23.00 mi1.25 mi6721-3715902-2365902-23614701(Top 52%)9479(Top 59%)9479(Top 168%)
24M24.00 mi1.00 mi6786-655921-195921-199424(Top 33%)6858(Top 43%)6858(Top 122%)
40K24.85 mi0.85 mi6787-15896+255896+257533(Top 27%)5738(Top 36%)5738(Top 102%)
25.2M25.20 mi0.35 mi6792-55888+85888+89027(Top 32%)6446(Top 40%)6446(Top 114%)
Finish26.22 mi1.02 mi6889-975918-305918-3010687(Top 38%)7342(Top 46%)7342(Top 130%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 21%
×21stories
+97ft-345ft

Overall

6066

Males

5516

M18-39

5516

5K→10K

3.1 - 6.2 mi

Top 24%
×5stories
+79ft-138ft

Overall

6867

Males

6176

M18-39

6176

10K→15K

6.2 - 9.3 mi

Top 21%
×3stories
+67ft-78ft

Overall

6066

Males

5516

M18-39

5516

15K→20K

9.3 - 12.4 mi

Top 21%
×5stories
+106ft-86ft

Overall

6026

Males

5459

M18-39

5459

20K→Half

12.4 - 13.1 mi

Top 20%
×2stories
+19ft-37ft

Overall

5677

Males

5197

M18-39

5197

Half→25K

13.1 - 15.5 mi

Top 17%
×4stories
+66ft-88ft

Overall

4879

Males

4487

M18-39

4487

25K→30K

15.5 - 18.6 mi

Top 20%
×9stories
+181ft-148ft

Overall

5589

Males

5007

M18-39

5007

30K→20M

18.6 - 20.0 mi

Top 30%
×5stories
+64ft-50ft

Overall

8508

Males

6726

M18-39

6726

20M→21M

20.0 - 21.0 mi

Top 43%
×8stories
+106ft-24ft

Overall

12354

Males

8527

M18-39

8527

21M→35K

21.0 - 21.8 mi

Top 52%
×7stories
+17ft-86ft

Overall

14678

Males

9560

M18-39

9560

35K→23M

21.8 - 23.0 mi

Top 52%
×5stories
+23ft-63ft

Overall

14701

Males

9479

M18-39

9479

23M→24M

23.0 - 24.0 mi

Top 33%
×6stories
+12ft-82ft

Overall

9424

Males

6858

M18-39

6858

24M→40K

24.0 - 24.9 mi

Top 27%
×1story
+6ft-20ft

Overall

7533

Males

5738

M18-39

5738

40K→25.2M

24.9 - 25.2 mi

Top 32%
×1story
+13ft-16ft

Overall

9027

Males

6446

M18-39

6446

25.2M→Finish

25.2 - 26.2 mi

Top 38%
×2stories
+22ft-21ft

Overall

10687

Males

7342

M18-39

7342

Passing Analysis

Category:
Athletes Passed
1089
Passed By
2571
Net Change
-1482
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#5407
5K → 10K32668-636#5407#6043
10K → 15K149116+33#6043#6010
15K → 20K153126+27#6010#5983
20K → Half2413+11#5983#5972
Half → 25K25912+247#5972#5725
25K → 30K209145+64#5725#5661
30K → 20M25219-194#5661#5855
20M → 21M15302-287#5855#6142
21M → 35K11219-208#6142#6350
35K → 23M28399-371#6350#6721
23M → 24M54119-65#6721#6786
24M → 40K6667-1#6786#6787
40K → 25.2M2934-5#6787#6792
25.2M → Finish35132-97#6792#6889
TOTALS10892571-1482
📊

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