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BOSTON MARATHON 2025

Cheng-Liang Chang

Bib: 11815•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M45-49)
#0 / 2386
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
8:19/mi
25:50
↑ 97↓ 3451.5%
10K· 6.21 mi
8:27/mi
52:06
↑ 79↓ 1380.4%
15K· 9.32 mi
9:17/mi
1:20:56
↑ 67↓ 78
20K· 12.43 mi
8:20/mi
1:46:48
↑ 106↓ 860.1%
Half· 13.11 mi
8:10/mi
1:52:22
↑ 19↓ 370.5%
25K· 15.53 mi
8:44/mi
2:13:32
↑ 66↓ 880.2%
30K· 18.64 mi
9:08/mi
2:41:54
↑ 181↓ 1480.2%
20M
9:22/mi
2:54:38
↑ 64↓ 500.2%
21M
9:52/mi
3:04:30
↑ 106↓ 241.6%
35K· 21.75 mi
8:36/mi
3:10:56
↑ 17↓ 861.7%
23M
9:25/mi
3:22:43
↑ 23↓ 630.6%
24M
9:05/mi
3:31:48
↓ 821.3%
40K· 24.85 mi
9:26/mi
3:39:52
↓ 200.3%
25.2M
10:35/mi
3:43:31
↑ 13↓ 160.2%
Finish· 26.22 mi
9:08/mi
3:52:49
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:52:22
Pace8:34 /mi
2nd Half
Distance13.11 mi
Time2:00:27
Pace9:11 /mi
📊Positive Split: 7.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:53:0725:508:1925:50
8:19
-
10K
6.21 mi11:19:2352:068:2326:16
8:27
+0:08
15K
9.32 mi11:48:131:20:568:4128:50
9:17
+0:50
20K
12.43 mi12:14:051:46:488:3625:52
8:20
-0:57
Half
13.11 mi12:19:391:52:228:345:34
8:10
-0:10
25K
15.53 mi12:40:492:13:328:3621:10
8:44
+0:34
30K
18.64 mi13:09:112:41:548:4128:22
9:08
+0:24
20M
20.00 mi13:21:552:54:388:4412:44
9:22
+0:14
21M
21.00 mi13:31:473:04:308:479:52
9:52
+0:30
35K
21.75 mi13:38:133:10:568:476:26
8:36
-1:16
23M
23.00 mi13:50:003:22:438:4911:47
9:25
+0:49
24M
24.00 mi13:59:053:31:488:509:05
9:05
-0:20
40K
24.85 mi14:07:093:39:528:518:04
9:26
+0:21
25.2M
25.20 mi14:10:483:43:318:523:39
10:35
+1:09
Finish
26.22 mi14:20:063:52:498:539:18
9:08
-1:27

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

8:10 /mi

Average Pace

8:53 /mi

Slowest Pace

10:35 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:51:08

48% of race

Time at Steady Pace

1:48:10

46% of race

Time at Slower Pace

13:31

6% of race

Average Pace: 8:53 /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 mi10:53:0725:508:1925:50
8:19
#18798
10K
6.21 mi11:19:2352:068:2326:16
8:27
#19142
15K
9.32 mi11:48:131:20:568:4128:50
9:17
#20658
20K
12.43 mi12:14:051:46:488:3625:52
8:20
#19840
Half
13.11 mi12:19:391:52:228:345:34
8:10
#19715
25K
15.53 mi12:40:492:13:328:3621:10
8:44
#19480
30K
18.64 mi13:09:112:41:548:4128:22
9:08
#19255
20M
20.00 mi13:21:552:54:388:4412:44
9:22
#19182
21M
21.00 mi13:31:473:04:308:479:52
9:52
#19099
35K
21.75 mi13:38:133:10:568:476:26
8:36
#18990
23M
23.00 mi13:50:003:22:438:4911:47
9:25
#18950
24M
24.00 mi13:59:053:31:488:509:05
9:05
#18911
40K
24.85 mi14:07:093:39:528:518:04
9:26
#18872
25.2M
25.20 mi14:10:483:43:318:523:39
10:35
#18888
Finish
26.22 mi14:20:063:52:498:539:18
9:08
#18912
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi18798119501195023138(Top 81%)13898(Top 86%)13898(Top 582%)
10K6.21 mi3.10 mi19142-34412103-15312103-15319527(Top 69%)12282(Top 76%)12282(Top 515%)
15K9.32 mi3.11 mi20658-151612759-65612759-65623138(Top 81%)13898(Top 86%)13898(Top 582%)
20K12.43 mi3.11 mi19840+81812399+36012399+36017080(Top 60%)11215(Top 70%)11215(Top 470%)
Half13.11 mi0.68 mi19715+12512344+5512344+5517009(Top 60%)11200(Top 70%)11200(Top 469%)
25K15.53 mi2.42 mi19480+23512236+10812236+10818564(Top 65%)11775(Top 73%)11775(Top 494%)
30K18.64 mi3.11 mi19255+22512096+14012096+14018308(Top 64%)11512(Top 71%)11512(Top 482%)
20M20.00 mi1.36 mi19182+7312046+5012046+5018608(Top 66%)11503(Top 71%)11503(Top 482%)
21M21.00 mi1.00 mi19099+8311990+5611990+5617766(Top 63%)11052(Top 69%)11052(Top 463%)
35K21.75 mi0.75 mi18990+10911921+6911921+6916059(Top 57%)10211(Top 63%)10211(Top 428%)
23M23.00 mi1.25 mi18950+4011873+4811873+4818281(Top 64%)11114(Top 69%)11114(Top 466%)
24M24.00 mi1.00 mi18911+3911833+4011833+4017781(Top 63%)10823(Top 67%)10823(Top 454%)
40K24.85 mi0.85 mi18872+3911789+4411789+4418424(Top 65%)11031(Top 68%)11031(Top 462%)
25.2M25.20 mi0.35 mi18888-1611795-611795-619277(Top 68%)11436(Top 71%)11436(Top 479%)
Finish26.22 mi1.02 mi18912-2411781+1411781+1419609(Top 69%)11634(Top 72%)11634(Top 488%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 81%
×21story building
+97ft-345ft

Overall

23138

Males

13898

M45-49

13898

5K→10K

3.1 - 6.2 mi

Top 69%
×5story building
+79ft-138ft

Overall

19527

Males

12282

M45-49

12282

10K→15K

6.2 - 9.3 mi

Top 81%
×3story building
+67ft-78ft

Overall

23138

Males

13898

M45-49

13898

15K→20K

9.3 - 12.4 mi

Top 60%
×5story building
+106ft-86ft

Overall

17080

Males

11215

M45-49

11215

20K→Half

12.4 - 13.1 mi

Top 60%
×2story building
+19ft-37ft

Overall

17009

Males

11200

M45-49

11200

Half→25K

13.1 - 15.5 mi

Top 65%
×4story building
+66ft-88ft

Overall

18564

Males

11775

M45-49

11775

25K→30K

15.5 - 18.6 mi

Top 64%
×9story building
+181ft-148ft

Overall

18308

Males

11512

M45-49

11512

30K→20M

18.6 - 20.0 mi

Top 66%
×5story building
+64ft-50ft

Overall

18608

Males

11503

M45-49

11503

20M→21M

20.0 - 21.0 mi

Top 63%
×8story building
+106ft-24ft

Overall

17766

Males

11052

M45-49

11052

21M→35K

21.0 - 21.8 mi

Top 57%
×7story building
+17ft-86ft

Overall

16059

Males

10211

M45-49

10211

35K→23M

21.8 - 23.0 mi

Top 64%
×5story building
+23ft-63ft

Overall

18281

Males

11114

M45-49

11114

23M→24M

23.0 - 24.0 mi

Top 63%
×6story building
+12ft-82ft

Overall

17781

Males

10823

M45-49

10823

24M→40K

24.0 - 24.9 mi

Top 65%
×1story
+6ft-20ft

Overall

18424

Males

11031

M45-49

11031

40K→25.2M

24.9 - 25.2 mi

Top 68%
×1story
+13ft-16ft

Overall

19277

Males

11436

M45-49

11436

25.2M→Finish

25.2 - 26.2 mi

Top 69%
×2story building
+22ft-21ft

Overall

19609

Males

11634

M45-49

11634

Passing Analysis

Category:
Athletes Passed
2475
Passed By
2589
Net Change
-114
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18798
5K → 10K141485-344#18798#19142
10K → 15K181534-1516#19142#20658
15K → 20K8224+818#20658#19840
20K → Half1272+125#19840#19715
Half → 25K28651+235#19715#19480
25K → 30K327102+225#19480#19255
30K → 20M13966+73#19255#19182
20M → 21M13249+83#19182#19099
21M → 35K12112+109#19099#18990
35K → 23M11171+40#18990#18950
23M → 24M8647+39#18950#18911
24M → 40K8546+39#18911#18872
40K → 25.2M2541-16#18872#18888
25.2M → Finish5579-24#18888#18912
TOTALS24752589-114
📊

Passing Visuals

Category:
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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