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BOSTON MARATHON 2025

Cheng Hao Chang

Bib: 28798•M

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
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
29:08
Rank: #23828
Start → 5K
29:08 | 9:23/mi
10K· 6.21 mi
57:32
Rank: #23418 (+410)
5K → 10K
28:24 | 9:08/mi
15K· 9.32 mi
1:26:16
Rank: #23289 (+129)
10K → 15K
28:44 | 9:15/mi
20K· 12.43 mi
1:56:03
Rank: #23249 (+40)
15K → 20K
29:47 | 9:35/mi
Half· 13.11 mi
2:02:35
Rank: #23284 (-35)
20K → Half
6:32 | 9:35/mi
25K· 15.53 mi
2:29:17
Rank: #23717 (-433)
Half → 25K
26:42 | 11:01/mi
30K· 18.64 mi
3:04:00
Rank: #23873 (-156)
25K → 30K
34:43 | 11:10/mi
20M
3:18:23
Rank: #23783 (+90)
30K → 20M
14:23 | 10:35/mi
21M
3:31:02
Rank: #23856 (-73)
20M → 21M
12:39 | 12:39/mi
35K· 21.75 mi
3:40:49
Rank: #24067 (-211)
21M → 35K
9:47 | 13:05/mi
23M
3:57:18
Rank: #24291 (-224)
35K → 23M
16:29 | 13:10/mi
24M
4:09:36
Rank: #24411 (-120)
23M → 24M
12:18 | 12:18/mi
40K· 24.85 mi
4:20:17
Rank: #24486 (-75)
24M → 40K
10:41 | 12:30/mi
25.2M
4:26:08
Rank: #24611 (-125)
40K → 25.2M
5:51 | 16:58/mi
Finish· 26.22 mi
4:37:42
Rank: #24679 (-68)
25.2M → Finish
11:34 | 11:21/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:02:35
Pace9:21 /mi
2nd Half
Distance13.11 mi
Time2:35:07
Pace11:50 /mi
📊Positive Split: 26.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:46:2729:089:2329:08
9:23
-
10K
6.21 mi12:14:5157:329:1628:24
9:08
-0:15
15K
9.32 mi12:43:351:26:169:1528:44
9:15
+0:07
20K
12.43 mi13:13:221:56:039:2029:47
9:35
+0:20
Half
13.11 mi13:19:542:02:359:216:32
9:35
0:00
25K
15.53 mi13:46:362:29:179:3726:42
11:01
+1:26
30K
18.64 mi14:21:193:04:009:5234:43
11:10
+0:09
20M
20.00 mi14:35:423:18:239:5514:23
10:35
-0:35
21M
21.00 mi14:48:213:31:0210:0312:39
12:39
+2:04
35K
21.75 mi14:58:083:40:4910:099:47
13:05
+0:26
23M
23.00 mi15:14:373:57:1810:1916:29
13:10
+0:05
24M
24.00 mi15:26:554:09:3610:2412:18
12:18
-0:52
40K
24.85 mi15:37:364:20:1710:2810:41
12:30
+0:12
25.2M
25.20 mi15:43:274:26:0810:345:51
16:58
+4:28
Finish
26.22 mi15:55:014:37:4210:3611:34
11:21
-5:37

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

9:08 /mi

Average Pace

10:36 /mi

Slowest Pace

16:58 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:02:35

44% of race

Time at Steady Pace

1:27:22

31% of race

Time at Slower Pace

1:07:45

24% of race

Average Pace: 10:35 /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 mi11:46:2729:089:2329:08
9:23
#23828
10K
6.21 mi12:14:5157:329:1628:24
9:08
#23418
15K
9.32 mi12:43:351:26:169:1528:44
9:15
#23289
20K
12.43 mi13:13:221:56:039:2029:47
9:35
#23249
Half
13.11 mi13:19:542:02:359:216:32
9:35
#23284
25K
15.53 mi13:46:362:29:179:3726:42
11:01
#23717
30K
18.64 mi14:21:193:04:009:5234:43
11:10
#23873
20M
20.00 mi14:35:423:18:239:5514:23
10:35
#23783
21M
21.00 mi14:48:213:31:0210:0312:39
12:39
#23856
35K
21.75 mi14:58:083:40:4910:099:47
13:05
#24067
23M
23.00 mi15:14:373:57:1810:1916:29
13:10
#24291
24M
24.00 mi15:26:554:09:3610:2412:18
12:18
#24411
40K
24.85 mi15:37:364:20:1710:2810:41
12:30
#24486
25.2M
25.20 mi15:43:274:26:0810:345:51
16:58
#24611
Finish
26.22 mi15:55:014:37:4210:3611:34
11:21
#24679
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi23828141621416223034(Top 81%)13860(Top 86%)13860(Top 246%)
10K6.21 mi3.10 mi23418+41013982+18013982+18022961(Top 81%)13790(Top 86%)13790(Top 244%)
15K9.32 mi3.11 mi23289+12913941+4113941+4123034(Top 81%)13860(Top 86%)13860(Top 246%)
20K12.43 mi3.11 mi23249+4013928+1313928+1323167(Top 82%)13876(Top 86%)13876(Top 246%)
Half13.11 mi0.68 mi23284-3513945-1713945-1723785(Top 84%)14144(Top 88%)14144(Top 251%)
25K15.53 mi2.42 mi23717-43314119-17414119-17425225(Top 89%)14737(Top 92%)14737(Top 261%)
30K18.64 mi3.11 mi23873-15614146-2714146-2724334(Top 86%)14227(Top 88%)14227(Top 252%)
20M20.00 mi1.36 mi23783+9014088+5814088+5822657(Top 80%)13371(Top 83%)13371(Top 237%)
21M21.00 mi1.00 mi23856-7314109-2114109-2124596(Top 87%)14184(Top 88%)14184(Top 251%)
35K21.75 mi0.75 mi24067-21114192-8314192-8327037(Top 95%)15356(Top 95%)15356(Top 272%)
23M23.00 mi1.25 mi24291-22414284-9214284-9226571(Top 94%)15117(Top 94%)15117(Top 268%)
24M24.00 mi1.00 mi24411-12014328-4414328-4426048(Top 92%)14831(Top 92%)14831(Top 263%)
40K24.85 mi0.85 mi24486-7514350-2214350-2225655(Top 90%)14615(Top 91%)14615(Top 259%)
25.2M25.20 mi0.35 mi24611-12514400-5014400-5028052(Top 99%)15851(Top 98%)15851(Top 281%)
Finish26.22 mi1.02 mi24679-6814422-2214422-2225935(Top 91%)14747(Top 92%)14747(Top 261%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 81%
×21stories
+97ft-345ft

Overall

23034

Males

13860

M18-39

13860

5K→10K

3.1 - 6.2 mi

Top 81%
×5stories
+79ft-138ft

Overall

22961

Males

13790

M18-39

13790

10K→15K

6.2 - 9.3 mi

Top 81%
×3stories
+67ft-78ft

Overall

23034

Males

13860

M18-39

13860

15K→20K

9.3 - 12.4 mi

Top 82%
×5stories
+106ft-86ft

Overall

23167

Males

13876

M18-39

13876

20K→Half

12.4 - 13.1 mi

Top 84%
×2stories
+19ft-37ft

Overall

23785

Males

14144

M18-39

14144

Half→25K

13.1 - 15.5 mi

Top 89%
×4stories
+66ft-88ft

Overall

25225

Males

14737

M18-39

14737

25K→30K

15.5 - 18.6 mi

Top 86%
×9stories
+181ft-148ft

Overall

24334

Males

14227

M18-39

14227

30K→20M

18.6 - 20.0 mi

Top 80%
×5stories
+64ft-50ft

Overall

22657

Males

13371

M18-39

13371

20M→21M

20.0 - 21.0 mi

Top 87%
×8stories
+106ft-24ft

Overall

24596

Males

14184

M18-39

14184

21M→35K

21.0 - 21.8 mi

Top 95%
×7stories
+17ft-86ft

Overall

27037

Males

15356

M18-39

15356

35K→23M

21.8 - 23.0 mi

Top 94%
×5stories
+23ft-63ft

Overall

26571

Males

15117

M18-39

15117

23M→24M

23.0 - 24.0 mi

Top 92%
×6stories
+12ft-82ft

Overall

26048

Males

14831

M18-39

14831

24M→40K

24.0 - 24.9 mi

Top 90%
×1story
+6ft-20ft

Overall

25655

Males

14615

M18-39

14615

40K→25.2M

24.9 - 25.2 mi

Top 99%
×1story
+13ft-16ft

Overall

28052

Males

15851

M18-39

15851

25.2M→Finish

25.2 - 26.2 mi

Top 91%
×2stories
+22ft-21ft

Overall

25935

Males

14747

M18-39

14747

Passing Analysis

Category:
Athletes Passed
1311
Passed By
2162
Net Change
-851
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23828
5K → 10K49989+410#23828#23418
10K → 15K248119+129#23418#23289
15K → 20K169129+40#23289#23249
20K → Half2055-35#23249#23284
Half → 25K34467-433#23284#23717
25K → 30K98254-156#23717#23873
30K → 20M12030+90#23873#23783
20M → 21M47120-73#23783#23856
21M → 35K5216-211#23856#24067
35K → 23M20244-224#24067#24291
23M → 24M19139-120#24291#24411
24M → 40K1489-75#24411#24486
40K → 25.2M1126-125#24486#24611
25.2M → Finish1785-68#24611#24679
TOTALS13112162-851
📊

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